Jesus Lord. I have to tell you that you simply just make rocket science look so easy. I took microfabrication when I spent a semester abroad in the US and seeing all those fully equiped facilities I just thought I would never work with it in our under-equiped labs in Brazil. I've been studying porous silicon (don't know if you've heard of it) in my lab at the University, but I reached a point where inevitably need to work with oxide growth, masks and doping. You just make it look possible now!

Thank you. I was beginning to think that this was a lost art. In the 70s and 80s this kind of thing was fairly common place amongst the smaller semiconductor makers and some hobbyist, those most of them were doing BJT devices, still making ICs with out the aid of a clean room. We need to learn this stuff again.

@gerryroberts662

11 ай бұрын

YES>...

This is very impressive. I worked for a semiconductor company back in the day and always assumed this type of fabrication was beyond mere mortals.

You make homebrewed transistors? IMHO, you are officially the coolest woman alive. :D

I remember watching this video years ago and just being blown away. Hope to do this project on my channel some day soon (giving credit to you of course)

Next episode : "Jeri shows you how to kill all the moles in your lawn by building your very own atom bomb".

"So easy even Jeri can do it." lol Isn't that like saying "A piece so easy even Mozart can play it."

@PatheticComputing It's surprisingly easy, although it took me three years of experimenting to make my first device. Watch out for exposed PN junctions. Keep oxide over them or they conduct.

@OMNI_INFINITY

2 ай бұрын

Secret sauce is the rust and stain remover. That was maybe historically fairchild’s “colonel’s secret recipe”

@OMNI_INFINITY

2 ай бұрын

Connecting substrate to ground 6:54 “gets rid of the pn junction” ? Talking about the junction region that has to be overcome by some voltage because some electrons from n side naturally paired a little into p side?

Wow, I've been thinking about ways to make mosfets at home since a while and searched on the internet if anyone figured out how to do it. For weeks I only found junk and felt like giving up until I stumbled across your video. This is just what I need, thank you a 1000 times!

This is amazing, honestly... I was really impressed when I saw Sam Zeloof printing his own microchips at his garage, but you have done it years ago, wow

XD CPU fan as a centrifuge... you are awesome.

I'm learning how to make mass spectrometers and stuff. I'll check this out again in a few months. Jeri and physics inspired me to study electronics. I think she is an amazing personality.

Oh my god. This is unquestionably the most amazing thing I've ever seen.

Really cool. My 1st 2 jobs out of college were in semiconductors. Here's a tip for those just wanting to see their own transistors work. For the gate, you don't really have to be so careful in getting roughly 1000 angstroms thickness. If you just get some sort of oxidation on there it'll still work, but you will need a higher gate voltage.

Very impressive! I thought about doing this at one point and even started to shop around for some silicon wafers on ebay. But I had a lot more research to do before even attempting this. Now that I know it can be done, I'm definitely going to try this one day!

Wish you had been around while i was studying transistors in school. Way cool.

Very cool Jeri! Thanks for posting this.

Oh wow... have I told you lately that I love you Jeri. But really this is great, awesome job!

@allmyenemies I use spin on dopants from Emulsitone they have borofim and phosphorosilicate. FYI. it's easier to work with phosphorosilicate films.

Ive never thought that it is possible to make dyi electronic components. Amazing

Very Impressive. I thought this can never happen, a home brewed transistors. Nice video detailed like it, i would like to try this. thanks for your post

THANK YOU FOR THIS. Been wondering how to do this kinda stuff.

@HD41117 This is the rinse water. I've use distilled water and made functional devices.

@TzzX78 It's not as bad as you think. All of the etches I show can be done with art store etchant(also HF), which is safe when handled as directed in the instructions. People etch glass all the time, without problems.

@supergenius1994 Ebay and an other companies that offer prime wafers. Very easy to find.

@bonecrime I tried a ring oscillator as my first IC, but it had a short. One of these days I will do more.

Great video! Thanks for sharing!

@ITGuru0111 Dust is not a huge problem when the transistors are as big your thumbnail.

@fdesmet2nerds Ha! That would be fun. The process of purifying silicon involves a lot of thermal cycles, acid and explosive silane gas. :)

As an electric engineer that does not know much about wafers, I found this video an eye opening. Thanks Jerri. A good Job! I suggest to make Kits for making transistors at home and sell them. I, for one will buy one or two kits for sure.

@SIGSEGV1337

3 жыл бұрын

If you're interested in making your own transistors there's a bunch of us in a Discord server

@leoplushd5133

3 жыл бұрын

@@SIGSEGV1337 share with me - Discord server

THIS WOMAN IS A GOD ALMIGHTY GIFT to us. Thanks woman. you make it for even the little guy. No one is without knowledge of what you have dome for womankind and youself. of course, be sure to keep aware of others taking advantage of you (and others) by making THE BOX....for your protection from "Freudian Trnasferrences" I speak in liue of more than ten years of par time bosses, workers, slow stickered vhiecles, and SHIFFTERS BOX. Paradigm Shift.

Thank you for the knowledge

Agreed. I learned synthetic organic chemistry when I was 14 or so. I started with a college textbook my sister left at home between semesters. I wasn't sure that my understanding of what I was reading was even close. But it turned out it was. I could make all kinds of stuff. All my kid money bought really nasty reagents (this was 1968 or so) and that was supplemented later by my HS chem teacher when she cleaned out her back room.

It brings Intel memories back...

This is SOOOO COOOOL! Thanx!!

@supergenius1994 They will show up on ebay. Keep an eye open for silicon wafer. There are companies that sell directly too.

excellent presentation, thanks for sharing

@Vatsek I have. It takes longer.

I am in awe. Keep hacking Jeri.

Thanks for sharing this!

Excellent. Awesome. You deserve an attagirl for even attempting this in anything less than a clean room. BTW, that's not Vcc, it's Vdd. Keep up the great work.

Keep up learning and reinventing

I guess this is the video that inspired Sam Zeloof. I had designed mixed-signed IC and always complained how tedious it was do to the layout. The fun part was only circuit design and simulations. It's refreshing to see how my GDSII was implemented

Now thats something awesome!

@BARONSCHWARZWALD No. The dopant is in glass form.

excellent job!

@DrMario2007baka Surprisingly two of the DLP TV's I picked up had quartz windows on the DLP unit. (IR compatible)

NIce Homebrewed Transistors!!!

@KarriKoivusalo I've been playing with photoresist, but haven't had good results yet. I think part of my problem is not having a good development tank.

Agreed on all fronts. In around 1983 or so it was $500 for setup and I think two packaged parts, in the most ancient of technology available (at the time, 5u (!) NMOS. I, too, run on a shoestring. I have to be happy just to have easy cheap access to decent PCB manufacturing. At the time I worked in sensor and transducer technology and I really wanted to get started making ICs so I could mess with the masks and get some chemical transucers built. Oh, well !

@jeriellsworth Thanks Jeri. Your video with the three stage rinse tank was a very detailed answer to this question, too. Great stuff - I'm excited to try it, too.

you would LOVE to work at ASML. have a whole factory and lab at your disposal. worked there my selves for years at E-dev. the dumpster was a gold mine at times for getting nice rare treats :)

@robsonnbi $10 -$15 from vendors or cheaper on ebay, but you have to know what to look for.

As I understand it, there are the most common type of power MOSFET, and the first to be widely manufactured. N-channel MOSFETs are workhorses in switching power supplies, motor drives, power inverters, or any electronic device where fast switching of high amounts of current is required. The only problem with MOSFETs is the fragile gate oxide, which can be destroyed by static electricity.

i wish i had a 1000 degree kiln, this is AWESOME!

@YoLninYo Solar cells are very easy to make with this process. Problem is that they take too much energy, because of the furnace and small batches. They'd never return energy to pay back 6hrs at 1000c.

@stephenadels6186

6 жыл бұрын

If you power the kiln with solar (pv and light), the 6 hours at 1K C is not accomplished with fossil fuels, but renewable energy, and they then don't have to "pay it back." What do you think?

@MrKDB001

4 жыл бұрын

You can get up to 1000 C using sunlight and a lens to concentrate it. not sure you're going to get 6 uninterrupted hours without trouble.

This is awesome.

Just started watching another of your videos on this. I was right that the substrate needed to be p-doped, but I didn't know that the wafers came like that.

Mind blowing!

@izzyjb That was me. I also showed transistors, but you might have missed them.

Wow, this is great! I'm glad to see you do it! What is the amp rating you can flow through it? I'm guessing you could make whatever size Fet you want right? Good job Lady :-)

@PatheticComputing I've tried boric acide roach killer which worked a little. I tried red phosphorous from matches, but it didn't seem to work, but I didn't try more than once.

awesome! But what equipment I need to get 1000°C at home? When I had listening semiconductors course in university, I only imagined large industrial facilities as possible place to build transistors, chips etc.

@MrKDB001

4 жыл бұрын

Propane Burns it 1995 c. MAPP gas goes up to 2020. You could even use sunlight and a magnifying lens. That might actually be easier to control than the burning gases.

First of all, great video! Very inspiring! Could you give a little more information on the furnace you were using? It seems to be the most expensive bit in this whole exercise and the only real lab equipment needed. Could you recommend a model to copy the project on a tight budget?

thank you sir

I must say, i am not impressed easily. But in this case, knocked out !!!

@alexpmK3

5 жыл бұрын

Brilliant Jeri

you are best for my question , that is , what physical changes makes same types transistors ( like BJT or FET ) little bit different from each other like in bjt , bc547 , s8050 , 13001 ext . my point is what points are responsible for transistor current , gain , ft band, voltage , breakdown , resistance ext ???

Love it

Awesome!

VERY COOL!!! Homemade diodes and transistors are something I have been thinking about making for a while. I have read that it is possible to use lead sulfide (a chemical that could be made at home much more easily than silicon metal) as your semiconductor. Have you ever tried that or though about it? Also I was wondering while watching this if you could mechanically remove the oxide (with fine sand paper or a knife/scraper) instead of etching it with acid?

@BrekMartin

9 жыл бұрын

JaycubL Hi, I was thinking the same thing since it’s so big, so the acid isn’t needed.

I have 2 questions. 1) Where do I get phosposilicate? And 2) does this work on N-type material for making an n-type transistor?

Very impressive! Can I ask, How important is having the Si wafer surface with a given crystal orientation (you mention 100 in your experiment)? Are other orientations OK, or is 100 the best? Also, is it important to have a single crystal orientation, or could a conchoidal surface also be used I wonder - have you ever tried with fractured Si pieces instead of nice Si wafers?

Jeri, you mention "the water" beading up on the exposed silicon layer. Is this water used to rinse the etchant from the surface? Sorry if it's a dumb question, just wanting to know where it's coming from and how it's being used.

To increase the rate at which the oxide grows, do you think it would be beneficial to create some sort of mechanism to force steam through the furnace? I'm envisioning a coffee machine repurposed to just boil water and have the steam flow into the furnace, perhaps a low rpm fan. Also if the wafer could be mounted such that it was vertical somehow, the steam would hit it much more evenly I think.

Excellent! Have you measured the Rds(on)?

this is brilliant! have you ever tried making solar cells at home in your furnace? there is no opensource method on the web that I know of ... is it too hard or just too easy so no-one tries it?

@Gta2CubanPete Check my other videos. I have a demo of it driving a blue LED.

Curious . . ? What would the current rating be on these things? Have you blown one up to see it's tolerance??

I envy you the feeling you must have had with your first success. I couldn't help but imagine the pioneers working their way past insurmountable problems to achieve the same thing without the benefit of prior knowledge. Amazing. Would putting the wafer off-center make the spin coating a bit better? I got the impression that such a small wafer in the center like that wouldn't receive even and/or high centripetal (centrifugal? ...) forces. Hmm. The "real" machines center the wafer though...

Also what model furnace did you use to grow your oxide? I tried to tell from the picture on flickr but couldn't see it.

great!

it was 1 of my dream to see diy transistor fabrication .

@SIGSEGV1337

3 жыл бұрын

We have a Discord channel about this stuff if you're still interested

@omsingharjit

3 жыл бұрын

@@SIGSEGV1337 share with me

@SIGSEGV1337

3 жыл бұрын

@@omsingharjit Go to add server and paste this code, it should add you: X4KBJzvK

Really excellent video. One bit of feedback is that you did not mention what temperature the kiln should be at to grow the oxide layer.

amazing:)

@jeriellsworth I'll be looking forward to seeing it!

@jeriellsworth Hello again. I was wondering if you have tried any phosphorus dopant other than the Emulsitone stuff with any success. Also, can you tell us how much that phosphorofilm costs? Did you buy that kit off their website, cause it's really expensive...

From where did you get the phosphorosilicate?

Hi, which kind of liquid you use for doping silicon? You have used boron atoms? If i have a p-type silicon i have to put a n doping for the n-wells, right!? In your bottle there is a label "Boron" but this kind of doping will put a p-well, you have to make a p or n well!?

I wish I had your initiative and motivation......

@CampKohler Why? because we can! That's what makes science & technology better

you had me until you mentioned the HF... I'm not afraid of much, but that stuff is freaky! but really, this is brilliant. thank you!

Pure junk yard mechanic Genius! Thank you lady! Just not clear about 4:13, how do you drive the phosphorous layer in? Do you just leave it to sink in?

@tomaspecl1082

5 жыл бұрын

You coat it in the phosphoric acid (or other substance containing phosphorous) and heat it to very high temperatures (1000C) and it will slowly difuse in.

So without have a substrate, I would end up with a IGBT?

I know it's been a while since this was made, and Jeri might not be watching any more, but is there a reason you couldn't do physical etching instead of chemical? At this scale it seems like maybe you could.

lol, love the spin coater (fan). This is cool! So that was a PSG layer you used to dope the silicon? Or a BPSG? (I guess it would need to be more heavily Phosphorus doped to diffuse N-type wells). Interesting, but can see how it would work rather well. Slightly surprised about the PSG use since it's often used as an outer reflow and final passivation layer and for smoothing out ruts and points before laying down electrodes - but it does makes sense because I think the Phosphorous moves to the outside of the PSG during baking, which would make it available for the later diffusion step. Interesting. Rust & Stain remover as etchant - wow, I didn't know that! Conductive epoxy for the gate electrode - wow, I am blown away! Yeah, I can see how this would work. Nice job!!!!

11 ай бұрын

Actually, in some papers I had read, the PSG layer is removed with HF. I spent a couple weeks looking for HF alternatives and I founded that NaOH and KOH can be used for SiO2 etching.

It would be awesome if you'd build some kind of working circuit out of your homemade transistors! :D

I want to make hundreds of these, and build a simple CPU out of them. Don't know if it's a good idea, but still tempted.

@YoLninYo There was someone showing home made solar cells at Maker Faire 2009.

Where can I get a small piece of the proper silicon wafer?

I wish kids today were into this.... I loved working with j-fet transistors and unijunctions.... OMG... Creativity and innovation is missing in America today big time.... It has progressed to this today... We seemed to have dumbed down today.... My local library no longer carries Technical manuals on electronics or electrical engineering, or ARRL books... But you sure can get a good book on snookie and jersey shore!..... LOL

@magey3794

5 жыл бұрын

13 year old here. We still are