Really cool stuff! I'm looking forward to the rover wheel design course.

@BreakingTaps

Жыл бұрын

Thanks Ben!

@st3althyone

Жыл бұрын

NEEEEEERRRRRDDDDSSS!🤣😆🤣

@seditt5146

Жыл бұрын

@@BreakingTaps Have you two ever collabed? I could only imagine what the two of yall could come up with.

@st3althyone

Жыл бұрын

@@seditt5146 That would be amazing.

@felixman9691

Жыл бұрын

Meeeee toooo!!

I used to watch pictures painted with electrons all the time. Now I'm watching this video, which is painted with electrons in a different way.

@nixietubes

Жыл бұрын

Or both ways if you're cool 😎

@ProjectileGrommet

Жыл бұрын

Underrated comment

@AsymptoteInverse

11 ай бұрын

Come to think of it, electron beams are probably how a lot of people saw Rick Astley for the first time. And now he's back!

Ive been Rickrolled by an SEM image, nothing could prepare me for that...

Mixed feelings, I don't see many taps breaking in your videos anymore. I'm very glad that you're making these videos though 😘

@BreakingTaps

Жыл бұрын

Fear not! I've been doing a lot of machining work lately in the new shop and hope to be showcasing it in future projects (including, alas, many broken taps). Have some interesting stuff that will feature various machining and engineering stuff :)

@jimurrata6785

Жыл бұрын

​@@BreakingTaps I hope you've made yourself an EDM to eat those broken taps out of the hole. 👍

@keith_cancel

Жыл бұрын

This is still technically subtractive manufacturing. Just so tiny that you can't use a tool to directly cut the features so one use acids instead for example. Although it can also become additive if instead of using an acid you deposit something lol.

@seditt5146

Жыл бұрын

@@keith_cancel Currently its just photoresist correct? I believe he could go any direction from here. Vapor deposition would yield additions. Acid etching could create subtraction. Hell pretty sure he could even use this to dope the wafer because I am almost sure I remember seeing it done somewhere in which they placed solutions with the dopent on top and the electron knocks some atoms into the silicon. It gets put in the photoresist. I'm over here excited after I was able to recently create my own specific gravity balance with scales of roughly 20 milligram and 4mg tolerance thinking i have good precision and this dudes over here capable of making his own nm microchips and shit.

@UnitSe7en

Жыл бұрын

No spigots, nozzles or stopcocks, either!

My late father named his precision machine shop "Sub-Micron Precision". He wasn't doing anything that precise. We could hold +/-0.001" but his whole theory was that people would just hear the name and believe it. Miss you dad, wish you could see how far I've come on my own with CNC machines and life as a husband and father. RIP

I know this video took a while, but I'm glad you never give up, you never let us down

@1224chrisng

Жыл бұрын

he truly never ran around or deserted us

@st3althyone

Жыл бұрын

I see what you did there. 🤨🤨

@tomjohnson5713

7 ай бұрын

He never even said goodbye... how rude

Amazing how far your home cleanroom has come! Some of the smallest features were probably washed away during development due to their high aspect ratio. I suggest a post-exposure bake unless you want to invest in a bottle of adhesion promoter.

@BreakingTaps

Жыл бұрын

Noted! Will look into some adhesion promotor!

@st3althyone

Жыл бұрын

Friends help friends get baked. 😆😆

@EvanZalys

Жыл бұрын

PMMA doesn’t really need standard adhesion promoter. An ion mill or o2 plasma should do the trick.

This video has convinced me that the first practical homebrew DIY CPUs will be created using electron beam lithography instead of photo-lithography. The advantage of having a higher beam precision and not having to deal with unwanted exposures from lighting in the room would be a huge advantage. The disadvantage of much longer production times won't really be an issue when you are your own customer.

@graealex

Жыл бұрын

Not really, hard vacuum and electron beam makes it pretty complicated. Still thinking about Huygens home-made DLP stepper. And DIY stuff doesn't need to be small either, you're not going to get a good enough and consistent process control for multiple masking, etching and doping steps at nm scale at home. A 4004 is 10um structure, yet until now, no DIY version has been made. But should be more than doable with rather simple photo lithography.

@RobertElderSoftware

Жыл бұрын

@@graealex That's a good point, I forgot about the need for a good vacuum. I wonder if there is any kind of novel and 'innovative' way that you could just not use a hard vacuum, or maybe just a lesser one? I suppose the problem with normal atmospheric pressure is probably that it causes electron scattering? I wonder if there would be some clever way to avoid/minimize the electron scattering with different gasses/materials etc.?

@keith_cancel

Жыл бұрын

@@RobertElderSoftware Applied Science showed how to make a scanning electron micro-scope years ago. A lot of overlap so that could be used as a starting point instead if one does not want shell out tons of money for something pre-built.

@graealex

Жыл бұрын

@@keith_cancel But you have to agree that the DIY microscope was shite, compared to the commercial one he got as a replacement, although still quite an old model. Making this stuff "at home" is just not feasible.

@hamjudo

Жыл бұрын

Check out Sam Zeloof's work. He made his own UV lithography setup and made the first DIY integrated circuit in his parents' garage. It was an OpAmp, but his long term goal is to make a CPU. He has graduated from highschool and is now off at college. I wouldn't be surprised if he shifts his focus to something even more amazing than making a DIY CPU.

take all the time you need for content. the mental health of our creators is worth it

Glad you're back Zach! And on top of that with a lithography video, my favorite subject. Being Rick-rolled in that intro was great! 😃.

@BreakingTaps

Жыл бұрын

Thanks! Was a nice little YT holiday, feeling much more refreshed now :) I have several of your videos queued up for watching since I've been away, and I hear rumor your most recent one has a fun surprise 😄

@HuygensOptics

Жыл бұрын

@@BreakingTaps That is correct, you can exercise your dance moves while at the same time get informed about some important optical concepts and terminology😉. KZreads AI classified the video as "Comedy" which was not very good for views, because of course it wasn't. Ah well, who cares. Most important thing is to keep doing the things you like most.

@BreakingTaps

Жыл бұрын

Oof, always frustrating when the Algo decides a particular video should or shoudn't be shown. I have some videos which I spent months on do terribly, and others that I basically threw together in an afternoon and expected to do awfully become some of my most viewed. Sigh 🙃

Fun fact about the rover wheels, the engineers at JPL were developing (though it didn't fly with curiosity) a modified wheel with a Raman spectroscopy sensor in it, where it would take continuous samples as the rover drove. Really clever. It was behind a sapphire (I believe) window.

@graealex

Жыл бұрын

Raman (after the guy), not ramen, the noodles

@cdburner5911

Жыл бұрын

@@graealex Doh! My bad. Thanks for correcting me.

Item 1 is how much I love the almost spy scene at the beginning matched with the googly eyes on all the equipment. Item 2 is all the rest of it is just amazing.

@BreakingTaps

Жыл бұрын

Googly eyes truly make the world a better place 😊

With this resolution, you should be able to print a conductive tuned antenna array for a specific light wave frequency. For example, a blue laser with a known wavelength of 490nm would have a dipole antenna length of 490nm that would exactly absorb the coherent light energy and convert it to electrical power. Could you print a tuned array of 490nm dipoles then hit it with a blue laser to see what kind of conversion factor you would get? If you could print a whole array of different dipole antenna with lengths in the visible range, you could make efficient light collectors for detectors or possible power generation.

@randomname4726

Жыл бұрын

I would love to see this in a video.

@BreakingTaps

Жыл бұрын

Well that sounds interesting! Will do some reading, this is way outside my knowledge at the moment but it sounds like it could be a really fun project!

@Eltro101

Жыл бұрын

@@BreakingTaps You can get SPR plates pre-coated with gold that should enhance the coupling with the light even more

@mikejones-vd3fg

Жыл бұрын

@@BreakingTaps The commenter is suggesting that with this technology, it would be possible to create a pattern of tiny metal antennas on a surface that are specifically designed to absorb a particular wavelength of light. For example, they mention a blue laser with a wavelength of 490 nanometers. The antennas would be designed to have a length of 490 nanometers, which would make them efficient at absorbing this particular wavelength of light. By creating an array of these antennas, it may be possible to create an efficient light collector or power generator. When the antennas absorb light, they generate an electrical current. By creating an array of different antenna lengths, it may be possible to efficiently collect a wide range of different wavelengths of light, which could be useful for applications like solar energy or high-resolution imaging. (Chatgtp maknig sense of the comment)

@mikejones-vd3fg

Жыл бұрын

to be fair chatgtp also just repeated what the original commenter said, without understainding that we dont understand lot of the industry specific terminology and if youre goal is to help people understand, its not helpful talking this way, so i just respsonded with "i dont understand" and it gave a more clearer explanation for someone whos not deep into this stuff, a simple array of small attenas for power genreation, sort of like maybe how solid state fans with their many vibrating membranes that give them some crazy blowing air efficiencey compared to spinning fans. Same could happen with solar energy which could be huge. Solar in the winter is pretty inefficient unless you have crazy amount of panel, even just a doubling of efficiecy could change that and the more energy independance we have, the less we all fight for oil. And the universe is full of it, yet we're hunkering down to stay on this planet forever which is impossible and shows any lack of foresite about the universe and our time to eventually get off this planet for real will come one day, i hope we're motivated to leave before then. But i have a feeling exploding bombs as propellants isnt going to cut it for energy. And ultimately, the universe made energy, maybe it can happen again? why do we have to suck energy from stars even.. those wont last forever either, where did they get their energy from? maybe we can get some there too. Anyhow I agree with original commentor, it would be cool to see what kind of power efficiecey an array of tiney metal attenas could produce in the same wafer space compared to a solar cell or something. And as good as chatgtp is with its knowlege, it wouldnt have come up with an idea like that, so we still have a purpose hehe.

Oh, definitively take care of you first, youtube second - kudos for that and being open about it!

100nm, that's GameCube territory. It would be cool if you used this to print out an 8086 or an arm chip, probably more attainable as you'd have quite a bit of room for mistakes.

@anon_y_mousse

Жыл бұрын

Now that is something I'd like to see. Printing old chips to repair old devices would be awesome. Or even just build a whole new one from scratch.

@st3althyone

Жыл бұрын

That would be a great project to work on. I’m sure it would take a shit ton of time and effort, not to mention the engineering required to accomplish the task. Not insurmountable, but challenging.

@andreanardi6301

Жыл бұрын

Many of the retro chips have a corresponding VHDL implementation from the MiSTer project. I would be could if we could transform those into a silicon design and replace some chips.

@SianaGearz

Жыл бұрын

I think you have to consider the small scanning aperture and difficulty neatly stitching together multiple scans. I suggest that very simple chips could be a better first target, sneaking up on 4000 gates which is 6502 complexity. It is perhaps exciting that you can image something really small and fine detail, but you still have difficulty etching and whole chemistry and with lack of cleanroom environment. There are a lot of low complexity custom chips lacking in availability which are dying in classic computers. Also call Sam Zeloof.

@anon_y_mousse

Жыл бұрын

@@SianaGearz Not only would that be easier, but it could potentially be very lucrative as well, which would help fund building more infrastructure and allowing for a gradual increase in complexity. I would love to see that happen.

You're videos are never too long! Yes, I may not watch them in one sitting , but I have ALWAYS finished them. Thank you so so so much for sharing explorations of these phenomena with us. I am entranced and truly enlightened while watching your videos. Don't ever stop sharing your incredible talents with the world! ...of course, do it on your own terms, at a healthy and sustainable pace. No one cares if you only post once in a while. Your videos display weeks and months and sometimes years of effort. I am rooting for you man!

My first run-in with this technology was when I was 13. It took me a while to understand how a microscope could be used to produce images instead of taking them. What helped me open my mind to the idea was a simple camera. If you have a camera it takes a picture, but if you were to shine an image out of the senzor you would literally get a projector. I know it is not the most acourate example, but it helped me understand how a taking device could be used to produce and image.

Glad you're taking care of yourself, and smart enough to have a break when needed! Also, I rly love your videos. I'm just a humble chemist to-be, but I thoroughly enjoy videos like these (you, Applied Science, Huygens Optics, BPS Space, etc.). Rly hope to be able to have my own small workshop at some point in the future

As someone who works in a materials characterization lab and is about to start a project with EBL, this video has been great for getting an idea of what I'm up against. TYSM!

Absolutely loving your content, you've been a large motivator for side projects of my own (currently attempting to build a light sheet microscope)

I recently started my PhD and got my hands on an SEM, I can relate so much with this video and it’s super helpful thank you so much!!

Congratulations; first time I've enjoyed being rickrolled and not even seen it coming..

I did research in using MeV proton beams for lithography. Proton beam writing has advantages, high aspect ration (depth vs beam size, ~1 um^2 vs 60-100um depth). Accidentally created buried features, where the surface was under exposed (electronic stopping small) and the buried region was fully exposed (nuclear stopping high near end of range). Ice cold 70% IPA is a amazing improvement. We used IPA/MIBK as a developer and had a hard time finding the perfect balance of dosing and developer, especially for deep feature.

you're so good at explaining these kinds of things, it's so easy to follow, and actually understand, really a rarity on youtube!

amazing as always

Finally a use for all those CD case covers! (: Glad to hear you were able to take some time off when you need it. Those wheels already look amazing, also it's great they are made from the same (general) material. It's bonkers to think how much force was required to abrade away that much aluminum. (:

@BreakingTaps

Жыл бұрын

Thanks! And yeah, it also blows my mind how the real wheels were made. Much larger, milled from a single block of aluminum, and the "skin" of the wheel is just 0.75mm thick! 🤯

@SeanBZA

Жыл бұрын

@@BreakingTaps I know a machinist who made new bushings for a machine. Bronze, and he started with a 60kg block of continuously cast bronze alloy, and the final bushing was sub 1kg. Plus nearly 60kg of scrap as shavings, he ended up with a final wall at 2mm in places, from the 400mm diameter original block. Needed to put in both eccentric holes for adjusting, plus machine in the gear teeth on a ridge to allow it to be adjusted, plus all the oil grooves and passages to allow both sides to receive lubrication. No drawings of the original, just good measurements of the existing shaft and the hole, plus the worn part to take measurement from. That was about a month to make the two, each coming as separate 60kg cast blocks.

@st3althyone

Жыл бұрын

That is so amazing!

I used to do a lot of EBL on a similarly jank system. It sounds like you would benefit from having a 'dump' area that the beam draws at the end of your process. Basically add a box that takes 30 sec to draw at the end of your pattern of interest. Then you can stop the process within that 30sec window and it won't effect the pattern you care about.

Thanks for the mention in the description! Hopefully I'll be able to finish my video on this soon :)

An idea for the production problems at 13:38 might be to throw a small ultrasonic piezo transducer in while you're giving it the acetone bath. Essentially vigorously shaking the fluid, instead of the wafer itself, to give a more thorough monomer removal process. Might speed it up a bit though. Or delaminate it a little more. I have no idea what power or frequency you'd be aiming for (it would be container and liquid volume dependent anyway I'd guess).

I love the old cd/dvd holder lid splatter protector.

I'm working on photolitho at Purdue, glad to see others working on it.

DUDE! best video yet, freaking loved it!

that rover wheel is super fascinating! I would totally buy one because as someone with Autism its always nice to have something tactile for sensory stimulation. Also i like space stuff.

i love your work, keep it going!

this channel is just incredible man

Some of the cutest things I have encountered is tiny wafer carriers. Like they normally make them for 300mm wafers or 50mm wafers for R&D. But at home I have some for 22mm wafers, or a 10x10 piece sliced from it. And yes, they open up the wrong way.

Amazing and very clear video! Learned so much!!

My gosh that is really beautiful to watch. Also, I love the googly eyes. I thought I was the only one who stuck those on the lab equipt like that Thank you This is very helpful ❤

Absolutely loved the video!

somehow simple and accessible, yet also in-depth and complex. fantastic vid! have you seen the thought emporium’s project with neurons? they had trouble getting traces small enough on the slide for neuron growth, but this with vapor deposition would be perfect for that

@BreakingTaps

Жыл бұрын

Thanks! And oh yeah, I remember that video! Is he still working on that project (it was a year or two ago iirc)? I'll give him a ping and see if they need any help 👍

This is one of those videos where I wish I could like it twice.

Man it has been a while. You always manage to just hit that sweet spot between being general nerdy and scientific. A suggestion to what you can use your new found skill for is "microfluidics". Would be cool to see a cell separator or some wacky liquid logic. Hope you the best on future projects.

@BreakingTaps

Жыл бұрын

Thanks! ♥ Will take a closer look at microfluidics! I'm only familiar with the field from a really high level, but looks like there are a lot of cool potential projects now that I have a reliable litho technique

So educational, well explained and pleasant to watch! You are an awesome inspiration in many ways, and I am happy that you do your best to take care of your self (and share openly about it). Best wishes from a fellow KZreadr from Denmark. / J

OMFG! We’ve been Rick Rolled via Scanning Electron Microscope. This has to be the most Giga Chad Rick Roll ever. Congratulations!

Hey man! I've been watching your videos for a few years now and these videos have become an instant click when I see a new one launch. I'm curious what your background is and how you got into this space; what did you study in school and how did you start? You and Ben from AppliedScience are my biggest inspirations for my dream of having an awesome home lab I can run experiments in, but I don't have a background in engineering and I just graduated university with a computer science degree so I'm not sure where to start. Looking forward to the next one!

@BreakingTaps

Жыл бұрын

Thanks! :) So my career has been sorta all over. Went to school for CS, but switched to biology and graduated with a degree in molecular/cellular bio. Worked a few years in labs culturing cortical neurons and running cell assays, aiming to apply to grad schools for a PhD. But decided academic bio was a poor career choice and quit to do some programming freelancing (just simple website stuff at the time). Eventually joined a search/analytics software company (Elastic) and worked there for like 7 years, quit a year or two ago and am now somewhere in between a machine shop and a youtube channel, depending on the day 😅 All the material science/optics/microfab stuff is just interest from an amateur, no real training in it. Just find the stuff really fascinating and that leads to late nights reading papers and dreaming about how it could be done in a more modest, non-lab environment :)

Loving the nano science content! I wish I had access to a budget EBL in my lab for small iterations or tests. However I do have direct access to a wide variety of unique optical coatings (both metal and phase change materials).

Woah Zach this channel blew up! Do all your projects have to be soooooo incredible?

Love your videos, thanks

this man is incredible

This is the video. Magical my friend. Thank you.

Really great video, as always! You, 2strokestuffing (Performance 2 strokes are a suprisingly complex science) and Cranktown City are my favorite channels lately.

Funny, I just today happened across Richard Feynman's *1959* lecture _"Nanotechnology, There’s Plenty of Room at the Bottom"_

Goodness, I have worked in the field, and every day, wondered: this electron microscope can clearly hit this sample exactly the same way an e-beam could, why can't I just write using the instrument that clearly already works? Glorious to see people are doing it!

Loved this video!

Great to see more of the work you're doing, always a nice supprise to see a new vid. Don't expect you'll see this but either way thanks for being awesome!

@BreakingTaps

Жыл бұрын

Thanks! I try to read through all the comments, although replying to all of them is usually too challenging :)

I don't care what anyone says, I love that song and I've loved every Rick Roll I've been served. Although, this is certainly the highest class version I've ever seen and probably will ever see.

Holography. I need this for holography! Sub micron lithography would surely work well for reliable reproduction of interference patterns...

Super cool! I love EBL. Neat that you can do this for fun at home!

You know those great big fans they use in, say, COSTCO or other large warehouses? Yeah, I am one of those. Keep on keeping on! 🌞

another breaking taps video let's gooo!!!

This so cool and your results are absolutely incredible. Shameless plug for my startup, Ephemeraltronics. I'm working on a low cost electron microscope for high schools, universities, and small businesses that hopefully will also enable this exact process.

re: Extra traces:: When I was writing code to utilize the XY deflection of an oscilloscope to draw pictures using DACs I had a similar issue where the phosphor would light up as it made a trace from one vector image to another. I solved this by always going back to (0,0) when a path was complete. This sudden deflection was fast enough it did not leave a trace. So I would assume, when between shapes find the furthest the beam can deflect away as a single point and connect your shapes by tracing the path from the end of first path to the newly calc'ed point to the start of the second path. The distance traveled will lower the exposure.

@ZiDion

6 ай бұрын

Why

In addition to that at 20:06 - the beam blanker is not a electro magnet. it is 2 plates which charged positive,negative depending on you want it to blank or not. Actually a super simple piece of electronics to make. Would be easy enough to retrofit.

@BreakingTaps

Жыл бұрын

Ah, just electrostatics then. Makes sense, cheers for the note!

That's a hella lot of work for a Rickroll! Nice. LOL

@BreakingTaps

Жыл бұрын

Only the best for my viewers! 🥰

When at 10,000 year new civilization find Rick Roll on piece of silicon, what will they think of?

Your videos are absolutely lovely, i object to this video being to long though. I would have loved more details :) Lookin forward to many more of your uploads. I would love to hear about the design history of those rover weels :)

Very cool!

Oh boy dis gon b gud time to take a break in my process engineering excel work.

If you are worried about the acrylic not being fully dissolved (so long as it actually is acrylic instead of a contaminate) you can try putting the solution in a ultrasonic cleaner for a few minutes. At work we do this with all of our samples while we are preping them for the HPLC.

@BreakingTaps

Жыл бұрын

Will give it a shot! Might also be impurities/contamination in the acrylic itself now that I think about it. I assume those resin pellets aren't processed in super clean conditions...

@seeigecannon

Жыл бұрын

@@BreakingTaps something else you could do is run the solution through a syringe filter. At work we have those down to a filter size of 0.2um.

What a cool Video! Thank you for making them educational and entertaining without losing too many technical details. And please don't feel obliged to post Videos, stay save :)

Perhaps small nit picks on a great video : 1. Ebeam resolution is not diffraction limited. It is limited by aberration in the lens or from resist 2. Modern Ebeam resists are very similar chemistry to euv and duv resists. They use chemical amplification from an acid catalyst to knock off a protecting group which causes the polymer to be base (or solvent in negative tone develop) soluble. 3. Production Ebeam litho to create reticles is all 50kV landing energy. There is a sensitivity trade off that makes this the best landing energy.

@BreakingTaps

Жыл бұрын

Cheers for the corrections!

Very nice patern 😀

Thanks for this video! I'm very interested in experimenting with lithography in my "lab" but I don't trust myself enough to deal with chemicals safely. By any chance, are the chemicals involved in e-beam lithography safer to handle?

I'm loving the anthropomorphic lab equipment

@BreakingTaps

11 ай бұрын

Everything is better with googly eyes!

Yes Finally!

Nice video. Ice cold IPA/DI is a good call (see Rooks et. Al.) but we typically don’t puddle develop. We use vigorous agitation with the entire wafer dipped into a Nalgene bottle of IPA/DI. We usually dose at 1600 nC/cm^2. High acceleration voltages aren’t really necessary. We have an elionix HS50 designed for high current that tops out at 50 keV. Works great. PMMA in anisole is also a good call. I think you may be running into issues of the polydispersivity of your resist as you had suspected. You might be able to purify it!

@EvanZalys

Жыл бұрын

Also I’ve been doing EBL for about 10 years and never once used PEC. Depends on what you’re trying to do, obviously. For josephson junctions for instance, you just do parameter sweeps until the room temperature resistance comes out right and the thing looks right under AFM.

@BreakingTaps

Жыл бұрын

Cheers for the tips, really appreciate it! Will give vigorous agitation a try, and will look into purifying the PMMA (or just tracking down a bottle of the real stuff, can't imagine it's too expensive... I hope? 😅 )

@EvanZalys

Жыл бұрын

@@BreakingTaps it's about a grand per bottle from kayaku :(

this should be in mass production like 3d printer. so any kind of chip can be reproduce anywhere whenever the chip is needed. and since it's already inside of vaccum chamber it should be able to do pvd cvd all at once.

1:21 most satisfying pour

So cool

That wafer is dope, man.

Dude! This is freaky awesome! I kinda want to spend all my nonexistent money on one of these now!

The art of peace is a piece of art-Heal

isn't this how silicon wafer are made? =D

@cyber2526

Жыл бұрын

i just got here i haven't watched the entire video yet don't judge XD

Could you use the ebl patterned wafer as a mold negative to make nanotextured surfaces? For example, gecko feet are sticky because of their microstructure. maybe that effect (or any other surface energy effect) could be emulated in cast resins?

Making some poorly reflecting holographic optical elements? Gratings? Cool project. And what is the resolution of the xy dac?

Amazing video

As always, great video! Please make a batch of the rover wheels!

"Electron beam driven dopant diffusion in semiconductors" is a thing, so what is to stop you writing a custom one-off circuit directly into your silicon wafer? Digital holograms with the interference pattern rendered from 3D geometry files would be fun too.

@BreakingTaps

Жыл бұрын

Interesting! Didn't realize that was a thing, will do some reading on the subject! Even without that it should be possible to do small circuits (Sam Zeloof is doing that via more traditional techniques). But being able to dope in a controlled manner with an ebeam is a really interesting possibility. Probably faster/easier/more accurate than traditional thermal diffusion and masking. Thanks for the tip!

@DanielSMatthews

Жыл бұрын

@@BreakingTaps If you escape from the _"I need a process that will make millions of these things fast and at a low cost"_ mindset you should be able to do a lot in the bespoke integrated electronics area. It also makes the mind boggle as to what is going on in some classified lab somewhere, and has been for decades.

Another super-cool video! For slightly more automated proximity-effect exposure control, what if you took the image into Photoshop, copied it to a mask layer, then run a Gaussian blur (or some other blur operator) on the mask layer to get something you could use to vary the darkness of the original? You could adjust the amount of the effect with the transparency of the mask layer, and the range of the proximity compensation by varying the radius of the blur operator.

@BreakingTaps

Жыл бұрын

Ah that's clever, I like that! Should give a pretty good rough approximation I think, since the effect is mostly a gaussian process under the surface (and some similar but longer range fogging from backscatter on the top). Will give it a shot, thanks for the idea!

@DEtchells

Жыл бұрын

@@BreakingTaps Great, I’m happy it was helpful! Ah, I’d only been thinking about the backscatter, but thinking of your results again, I realize that the worst problems were on very fine-pitch detail, so that would have been more the subsurface effect. Ideally then, you probably want two mask layers, to model the two processes separately. The next question is calibration. For the backscatter, perhaps you could create a test structure with a high-exposure spot in the center, and then some sort of radial pattern around it of elements having different exposure levels. Perhaps something like a row of lines spaced broadly enough to avoid the worst subsurface effects. Then make a radial pattern of such rows around the center spot with different exposure levels. Run that and see how the ideal exposure varies as a function of distance from the bright center element, and you should be able to get some approximation of both magnitude and extent of the backscatter effect. Make and test a mask for that. If it’s close, you can then use it as a baseline when figuring out the subsurface effect. Of course, I’ve probably just described a few weeks of experimentation for you, easy from my end 😆 I love this sort of tricky physical system. I’m good at things that involve physical processes and mental models of them - but am complete crap at anything involving higher math. It’s the reason I bailed out of a PhD program in Applied Physics: I barely squeaked through the written exam and knew there was no way I could handle 3 hours of profs throwing problems at me on a whiteboard 😮 I love this kind of stuff though 👍 I forget, do you have a Discord? If you do, I’ll follow it. (PS: It would be way over the top, but I think the ImageMagick package lets you apply arbitrary convolution kernels :-)

Do you think you have enough precision to create patterns that would reflect light in perceivably distinct colors at the macro scale? Kind of like butterfly wings

This is at once banal and utterly astonishing.

Not sure if you will ever see this, but I’m a uni student who had to EBL extensively for my project. I noticed a few things different between our processes! First, your use of cold IPA is good, but you’re only putting a couple mL on your wafer. The heat capacity of everything from the wafer to the syringe is going to influence process temp! And temperature is a very important process variable: the kinetics of solvation is proportional to exp(-E/kT)! For me, I take a beaker of 0C 3:1 IPA:H2O and dunk my chip into it, and never let it go. And I VIGOROUSLY stir it around to ensure the exposed areas are always seeing fresh solvent at a consistent temperature. That might solve your particle issue as well. I try to keep my process as close to 30 s develop time as possible. At the last step, dunking the exposure in water will certainly arrest development, but if your PMMA features should be taller than they are wide, you risk the surface tension of the water collapsing your pattern during drying. Along these lines, I always determine the resist clearing “dose”, in uC/cm2, experimentally, and it of course depends on the average exposure of the proximate area. I didn’t see you mention this number, but I always use it as a very important parameter. For Si, the proximate area has about 7 um radius for my 30 kV system (converted SEM). The range is actually shorter for lower kV, but the proximity effect-induced exposure is much larger over that smaller range. Good luck on your future EBL! If you are still doing that.

@pappi8338

6 ай бұрын

That was a fantastic read! I work with Thermal Nanolithography, but I have used an Auger Nanoprobe. How long have you been using your recipe for?

@violincrafter

6 ай бұрын

I've been using this way since last year. Sometimes I change it up when I don't need that good of a resolution (not much difference in the end really). I increase the develop time and use room temperature.@@pappi8338

I love how I have you set with the bell on but am seeing this 3 days later. Screw you youtube. I think this is literally like one of maybe two channels I have with the bell on too as the videos are always awesome.

@BreakingTaps

Жыл бұрын

♥️

Great video, as always! Following from the first days) Please take care of yourself, mental health is extremely important! Thanks for education)

Best intro ever.

Great video!

@BreakingTaps

Жыл бұрын

Thanks! ♥

This is super fucking cool. Nice work sir.

I bet rover wheel + small 1 or 2 foot dust trough with red dust or sand == super satisfying...

didn't know that you used the Phenom XL, nice surprise! we assemble those at work :)

I worked as a photo and etch engineer in a four inch wafer fab, If you need any advice let , me know,