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Electron band structure in germanium, my ass (2001)

(pages.cs.wisc.edu)
901 points tux3 | 1 comments | 4/1/2025, 12:25:00 PM | HN request time: 0.265s | source
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sevensor ◴[4/1/2025, 3:29:00 PM] No.43547977[source]▶

I TAd a semiconductor fabrication lab class 20-odd years ago. Mostly it was about making sure the students had the absolute fear of God put into them about working with HF, but there was also a bit at the end where you actually got to do a voltage sweep and characterize your transistor. If in fact you had made a transistor rather than a needlessly complicated resistor. The other TAs and I passed this paper around and thought it was just hilarious.

replies(1): >>43549188 #
dvh ◴[4/1/2025, 5:10:00 PM] No.43549188[source]▶

And then there are Etsy moms making frosted shot glass

replies(2): >>43550734 #>>43553033 #
sizzle ◴[4/2/2025, 1:58:00 AM] No.43553033[source]▶

With HF?! Got a link to this madness?

replies(1): >>43559279 #
1. somebodynew ◴[4/2/2025, 5:48:00 PM] No.43559279[source]▶

Most craft stores carry a glass etchant like Armor Etch [0] as an over the counter product. The MSDS [1] indicates that it's an aqueous solution containing ammonium bifluoride, which exists in equilibrium with hydrofluoric acid.

[0] https://www.michaels.com/product/armour-etch-glass-etching-c... [1] https://www.jacksonsart.com/media/pdf/armour_etch_sds.pdf