That’s a pretty crappy wafer yield in today’s fab. They get upset if it’s <95% electrical (no sensors) where I worked, back when I was in manufacturing. I was thrilled when I landed the job at R&D. Now it’s, “Huh? What is this ‘yield’ of which you speak?”
It was pretty crappy yield even back then. Last I checked they’re running 99%+. A goodly chunk of that is the processes I improved and the cultural changes I drove.
Sooooo, do you need an R&D assistant?