[55873445216111]

All the big 3D NAND makers have already switched from floating gate to charge trapping. Basically the same as what you describe but basically the electrons get stuck in a non-conductive region instead of on an insulated gate.

[GCUMstlyHarmls]

> The grand artificers of the Unseen University—those who insist on calling themselves “makers” despite mostly making trouble—gave up on the old Floating Gate enchantments ages ago. Too fiddly, too explosive, and prone to drifting off when no one was looking. Now they use Charge Trapping. Same idea in principle: coax a few errant lightning-spirits into doing something useful. But instead of perching them on a precariously insulated sigil like nervous pigeons, the wizards now shove the little blighters into a quiet, rubbery pocket of reality where they can’t conduct, escape, or start a small civil war. Everyone agrees it’s much safer, except for the pocket.

~ Terry Pratchett's Disklessworld, book 8. (Re: Any sufficiently advanced technology is indistinguishable from magic)

[sevensor]

Cool! I’ve been out of the industry for over a decade now, so my process knowledge is a little quaint at this point.