Question

Why high effective mass of holes implies low recombination rate?

Answer 1

In the majority of cases, the top of the valence band is clearly "flatter" than the bottom of the conduction band. From this follows that the hole effective mass is often larger than the electron effective mass. ... The bottom of the conduction band is formed by the lowest unoccupied states.

Answer 2

In the majority of cases, the top of the valence band is clearly "flatter" than the bottom of the conduction band. From this follows that the hole effective mass is often larger than the electron effective mass. ... The bottom of the conduction band is formed by the lowest unoccupied states.