former operator AI Data center MOSFET ruggedness improvement
to who may actually read this (chat GPT helped me write this) :
AI/server 48V power stages seem to be pushing transient current density and thermal density into regimes where localized hotspot initiation may become increasingly important.
I’ve been wondering whether a buried-layer plus tapered vertical carrier-extraction structure could suppress localized filament nucleation by rapidly evacuating transient-generated carriers before parasitic current crowding develops.” -
MY BACKGROUND: I used to work on a HE implant tool in a fab - the main A-hole engineer was working on what is described above (I ran all the implants for it) what A-hole was building was for Radiation hardened parters for a NASA project (it worked - they turnout to be radiation immune @ 130um) however I remember a lot of test outcomes related to over voltage events and how the chip "junctions" were stabilized against these with the above structures.
I think the last idea we worked on were "tapered" vertical taps that would be a solution worth TCAD simulation?? I had ChatGPT create a hypothesis to present to y'all based on all the data I fed it : My hypothesis is that a graded/tapered geometry could collect carriers while remaining outside the dominant depletion contour (EPI) during normal operation. that localized thermal runaway is preceded by electrostatic and carrier-instability conditions that may be suppressible before hotspot nucleation occurs.” this structure will collect those carriers before they cause problems ... thoughts ?