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Home > The Amp Hour Electronics Podcast > #390 – An Interview with Sam Zeloof


	Podcast:		The Amp Hour Electronics Podcast
	Episode:		#390 – An Interview with Sam Zeloof
	Category:		Science & Medicine
	Duration:		01:36:57
	Publish Date:		2018-04-30 00:04:26
	Description:		Welcome Sam Zeloof! Sam is graduating high school soon, he’s currently finishing up his senior year. Sam started the process of making semiconductors in his garage 1.5 years ago 0h 1m 15s Sam was inspired by Jeri Ellsworth’s videos 0h 2m 45s He’ll be attending Carnegie Mellon University in the fall. 0h 8m 7s Book: Microchip Fabrication by Peter Van Zant 0h 10m 23s Chemicals are hardest to get 0h 12m 21s HF in contained in Whink Rust Cleaner 0h 12m 40s Stump remover 0h 12m 54s Boric Acid is in roach killer 0h 12m 59s Sam gives a tour of his lab 0h 14m 10s Recently finished version of a Dual PMOS differential amplifier! 0h 15m 49s Added SEM 0h 16m 3s Wasn’t an option to buy a vapor deposition machine, needed to build 0h 17m 43s It was PVD, not CVD 0h 18m 9s Sputtering aluminum 0h 18m 59s Mean Free Path 0h 20m 26s Follow along with the slides Sam prepared for a recent showcase of his work in Newark at the Trenton computer fest 0h 20m 52s Start with wafer, buy off eBay 0h 24m 48s Check resistivity 0h 25m 10s Might be obvious, but Sam is not in a clean room 0h 27m 13s Both Sam and Chris have worked in a Class 100 clean room 0h 28m 10s UDC internship working on organic LED processes 0h 28m 18s Oxidizing layer 0h 29m 43s Photolithography 0h 30m 9s Silicon gate vs metal gate 0h 31m 36s Self aligned gate 0h 32m 14s 4 mask set 0h 33m 3s What is doping? 0h 33m 42s Electrons and holes. Talking about holes makes understanding organic semiconductors easier. 0h 35m 37s Dopants are ppm and ppb 0h 37m 55s Phosphine and diborane 0h 38m 49s Adding chemicals and then diffusing 0h 41m 14s Hardest piece to find is the furnace 0h 41m 26s HF acid 0h 46m 26s HF etching of photoresist/oxide 0h 49m 26s Adhesion promoter HMDS 0h 50m 13s Spinning on the dopants 0h 53m 40s Spin coating allows uniform application 0h 54m 0s Migration of dopants down into the lattice 0h 54m 52s Get rid of thick oxide 0h 57m 12s Grow gate oxide 0h 57m 25s Field oxide is 5000-10000A 0h 57m 49s Gate oxide is 500 A 0h 58m 11s Alignment on wafers 0h 59m 43s Doing photolithography with a projector 1h 0m 49s Mike Harrison talking about projectors 1h 2m 26s EUV 13nm 1h 2m 39s Double Patterning 1h 3m 20s Scored corner and do y = mx + b 1h 6m 30s Grateful dead bears 1h 8m 25s Zeloof Semiconductor 1h 9m 57s Thinner layers you dilute etchant 1h 10m 45s Curve tracer 1h 12m 1s Polished surface is tough for probing 1h 12m 48s Make a 4 pin pogo tester 1h 13m 2s 3rd masking step (contact) 1h 14m 28s Metalization 1h 15m 30s Everything is shorted 1h 15m 36s Need to expose the traces that are remaining 1h 15m 42s How many transistors are you making? 1h 16m 33s Dual differential amplifier 1h 17m 40s With larger feature sizes if it looks good, i’ts going to work 1h 18m 26s CMP 1h 19m 35s Little Lisa slurry 1h 19m 54s Silane and CVD isn’t an option 1h 21m 6s Polysilicon enables more types/more intricate transistos 1h 21m 35s Max output swing isn’t possible with metal gate 1h 22m 17s Itsy Chipsy chip service 1h 28m 1s Design tools – Magic VLSI 1h 28m 41s Drawing block of transistors 1h 29m 17s QFlow 1h 29m 34s Going from Verilog to masks 1h 30m 4s MOSIS 1h 33m 36s Wirebonder in process 1h 34m 25s Former guest Tony Long might have one? 1h 34m 54s CMU has a new cleanroom and Sam will be allowed to work there as a freshman 1h 36m 8s Find Sam on YouTube, Twitter and via email 1h 37m 46s
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