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> Micron has begun production of the first 232-layer NAND chip in sufficient volume to feed storage partners. How do they manufacture this monster?
by murkt 4y ago
> Micron has begun production of the first 232-layer NAND chip in sufficient volume to feed storage partners.
How do they manufacture this monster?
- alyandon 4y agoMagic (at least as far as I'm concerned). I would love to see an updated version of this video: https://www.youtube.com/watch?v=NGFhc8R_uO4 https://www.youtube.com/watch?v=NGFhc8R_uO4
- murkt 4y agoI have basic understanding of a generic process. I mean specifically 200+ layers. Do they “just” deposit layer after layer after layer, 200-something times?
- alyandon 4y agoI am not going to pretend to be a process engineer (I am chemical engineer by education) but I can't imagine any other way to do it than as you described. Would really love for someone more knowledgeable to chime in though.
- wtallis 4y agoThey deposit half the layers, etch holes through them and form vertical strings of memory cells, then repeat all that to build a second deck of layers on top. The interface between decks is a potential source of problems, but is more manageable than trying to drastically increase the aspect ratio of the holes that need to be etched through the stack. Etching through lots of layers at once is why 3D NAND flash memory is actually economical, compared to basically every other kind 3D chips where layers have to be built one at a time.
- layer8 4y agoPuff pastry, nut brittle, tamagoyaki and folded-steel blades come to mind. ;)