Simple measurement of 300 K electron capture cross section for EL2 in GaAs

Abstract

A simple experiment involving only the measurement of dark current Idark and 1.1 μm photocurrent IPC in semi-insulating (SI) GaAs allows an accurate determination of the electron capture cross section σn for the important defect EL2 in GaAs. For 45 SI GaAs samples, from 12 different boules, grown by three different techniques, we find that IPC/Idark=1.96±0.05 at 300 K. This relationship gives σn=1.4±0.4×10-16 cm2, which is compared to previously estimated values. © 1996 American Institute of Physics.