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| − | I thought it would be fun to put some notes about silicon here.
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| − | Silicon can be bought in 4" wafers (small). Say 25 for $450. You want to start with doped silicon (as you won't be melting it down, and adding chemicals to the silicon) reference: https://www.electronicproducts.com/Analog_Mixed_Signal_ICs/Transistors_Diodes/DIY_transistor_fabrication_Are_you_up_to_the_challenge.aspx.
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| − | You need some basic equipment, but anyone with access to a lab or hackerspace might have enough.
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| − | From previous reference:
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| − | Nitrogen tank
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| − | Kiln
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| − | Hydrofluoric acid (HF)
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| − | Phosphosilicate film
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| − | Prime-grade silicon wafer
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| − | Vinyl sticker in place of photoresist for masks
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| − | Color chart for identifying thickness of oxide layer
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| − | I have nitrogen, an oven only up to 450F (not high enough...), can obtain HF and wafers... However, silicon is not cheap. This hobby looks to be on the expensive side.
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| − | Is there a limit to what size a die can be? How about transistors that are 4" across...
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