> Now we know that it’s possible to make really good transistors with impure chemicals, no cleanroom, and homemade equipment.<p>The good news here is that 2 of those 3 issues are pretty easily solvable. With some work, and a ton of HEPA air purifier machines, you could probably turn an area the size of a small shed or 1 car garage into a class 10000 cleanrom pretty easily. It would be simplest if this area were embedded in a larger area, like a 2 car garage, but, you could probably squeeze it into just a plain old 1 car garage.<p>Chemicals, you can buy online from scientific supply houses. Some, like acetone, you can buy from less specialized sources in high purity. Water and alcohol, you can either buy at high purity pretty easily, or buy lower grade stuff and purify it.<p>Of course, at the point where you're going for higher purity stuff like this, you might want to switch from acetone as a solvent to DMSO. DMSO itself is safe to handle and doesn't evaporate like acetone will.<p>> Silane<p>Yeah, nasty stuff. Toxic as hell, ignites spontaneously when exposed to air. I used to work near a rather large storage tank that contained the stuff. Needless to say, I am glad there never was an accident. :-) Very wise to avoid this stuff.<p>---<p><a href="https://www.americancleanrooms.com/class-10000-clean-room/" rel="nofollow">https://www.americancleanrooms.com/class-10000-clean-room/</a><p><a href="https://en.wikipedia.org/wiki/Dimethyl_sulfoxide" rel="nofollow">https://en.wikipedia.org/wiki/Dimethyl_sulfoxide</a><p><a href="https://en.wikipedia.org/wiki/Silane" rel="nofollow">https://en.wikipedia.org/wiki/Silane</a>