Photocollection efficiency and interface charges of MBE-grown abrupt p (GaAs) -N (Al0.33Ga0.67As) heterojunctions

Abstract
The photocollection efficiency of abrupt p (GaAs) ‐N (AlxGa1−xAs) heterojunctions is found to be far too large to be compatible with the unmodified Shockley‐Anderson model. The results are interpreted by postulating a positive interface charge density σ≃6×1011 cm−2.