Question #de35e
1 Answer
Oct 18, 2017
To make a
Explanation:
Adding boron atoms in place of some of the germanium results in a crystal with some lattice sites having only three valence electrons rather than the four that Ge possesses. This is (somewhat misleadingly) called a "hole", as one orbital will be "missing" an electron as compared to a pure Ge crystal.
Being sort of the opposite of an electron, the hole is considered a positive charge carrier, as electrons which drift from an adjacent Ge atom into a hole will appear as if the hole were moving in the direction opposite to the electron drift.