d,
N-type has extra electrons that can be pushed around easily. P-type has
"missing" electrons, but the "holes" can be pushed around.
I have often wondered whether a single slice of N or P type material would
conduct. They don't make single slices of course,
they add impurities of each type to different parts of a single slice to make
either diodes or transistors. And the process is a bit different with Field
Effect transistors and MOS types.
Jim
