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I wonder what kind of chemicals he uses to do all the etching and cleaning of silicon surfaces. Whatever it is, it must require careful handling. And that in h
by Someone 5y ago
I wonder what kind of chemicals he uses to do all the etching and cleaning of silicon surfaces.
Whatever it is, it must require careful handling. And that in his parents’ garage.
- kortex 5y ago> Instead of a standard HF etch, a buffered oxide etch of NH4F (Ammonium Fluoride) in HF can be used to control the etch rate and photoresist lifting. I use approximately 20-30g of 100% NH4F per 50mL of HF (stock whink rust remover) and etch time for 6000Å SiO2 is 20min at 20C. A couple drops of Triton X-100 nonionic surfactant may be added to the BOE to improve etch uniformity, wetting, and ensure consistency through a thicker resist. A good BOE recipe can be found here but assumes industrial-strength HF. http://sam.zeloof.xyz/sio2-patterning/ http://sam.zeloof.xyz/sio2-patterning/ See my other threads. HF is Serious Business, but approachable for the hobbyist if you know about chemical hygiene. You can buy Whink at the hardware store.