[pfdietz]

> Boron is usually the P type dopant of choice.

I want to note that in what has become the largest (by mass) application of semiconductors, silicon PV cells, boron has been replaced by gallium as the P type dopant of choice. Boron suffers from an annoying form of light-induced efficiency degradation that gallium avoids.

[sevensor]

Fair enough, my ion implant experience was DRAM / flash. I never worked on PV.