> 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, b

> 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I want to note that in what has become the largest (by mass) application of semiconductors, silicon PV cells, boron has been replaced by gallium as the P type dopant of choice.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.