Semiconductor device

摘要

A semiconductor device comprises stacked first through fifth semiconductor layers. The semiconductor device has an energy level condition of ¦Ec3-Ec1¦ APPROX ¦Ev3-Ev5¦, where Ec3 is a resonant energy level of electrons in a conduction band of the third layer and Ev3 is a resonant energy level of holes in a valence band thereof, and Ec1 is an energy level of a conduction band of the first layer and Ev5 is an energy level of a valence band of the fifth layer.