🚀 go-pugleaf

In article <25947@nigel.udel.EDU> berryh@udel.edu (John Berryhill) writes:
>  . . . . . . . . . .  We use a planar process that could be done at home
>except for the evaporative metallization.  FET's need a little bit more
>careful handling, but the primary demon isn't dust as much as Sodium
>contamination. As someone has pointed out, alloyed junction transistors
>ought to be fairly simple to make at home, but you've still got to
>figure out how to get the contacts on.
>
>--
>							      John Berryhill
>					   143 King William, Newark DE 19711


I was just wondering how you would get the high temperatures required
for solid state diffusion let alone oxidation in a home.  I suppose you
might get away with spin-on-glass cured in your oven for the oxides but
the diffusions have me stumped.  Yes, I know you can send away for
implants relatively cheap but thats cheating.  Hmm, maybe a solar
furnace could do the job in the right part of continent.

Re. sodium contamination problems - these would cause flatband shifts
but should not prevent the transistor from sort of working.  I recall being
taught that the biggest impediments to MOS FET development were the high 
interface state densities due to lousy oxidation processes, lack of post 
oxidation anneals and wrong crystal orientations.

Kitchen sink CMOS - the cottage industry of the 90's

Dave LeBlanc
dleblanc@joplin.mpr.ca