Xerz! :blobcathearttrans:
oh hey, I’m learning stuffs!
so I’ve been thinking about metasurface cameras and how they’re made out of silicon, and how people don’t realize silicon is glass, so glass must be doing fancy electrical stuff in both cases
and then I watch this video https://www.youtube.com/watch?v=1n_otIs6z6E
Xerz! :blobcathearttrans:
so I’m like “waitwaitwait, is glass a TERRIBLE electrical conductor then???? then why is it used for semiconductors??????”
and then the Wikipedia gracefully gives me the answer in a very technical, opaque way – but I get it perfectly after watching the video
“The relative lack of performance in early silicon semiconductors was due to electrical conductivity being limited by unstable quantum surface states, where electrons are trapped at the surface, due to dangling bonds that occur because unsaturated bonds are present at the surface. This prevented electricity from reliably penetrating the surface to reach the semiconducting silicon layer.“
https://en.wikipedia.org/wiki/Silicon#Silicon_semiconductors
Ekaitz Zárraga 👹
@xerz i studied a little bit of semiconductor theory at uni, if you want to ask... maybe not a good idea but still.
Ekaitz Zárraga 👹
@xerz i don't remember exact names of things. I remember p/n stuff, doping, what happens when you put silicon under light...
I also studied chip fabrication but I forgot most of it, the thing I remember the most is how to purify silicon.
Xerz! :blobcathearttrans:
@ekaitz_zarraga oh, how much did it get into? Did you learn about how to do stuff like surface passivation with lithography? :blobcatbreadpeek:
Ekaitz Zárraga 👹
@xerz well silicon is purified with chemical methods first until it's almost pure and then purified better with physical methods, which are more effective!
They start melting the silicon piece on one side and go moving to the other, letting the side they just left solidify again. It is known impurities stay in the molten part so they drive all the impurities to the corner.
Xerz! :blobcathearttrans:
@ekaitz_zarraga oooo, got anything in particular you could recommend?
Ekaitz Zárraga 👹
@xerz repeat the process some times and then you can cut the corner off with all the impurities inside!
Ekaitz Zárraga 👹
@xerz btw, the subject at university was evaluated with a 100 question test that did -1/3 or -1/2 each time you failed to answer a question.
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