Dependence of performance on the fixed surface charges in the Hg_1MINxCd_xTe photoconductor

The effect of fixed surface charge density on the performance of HgCdTe photoconductive detectors was theoretically studied by using the Fang & Howard variational method to calculate the distribution of potential and using an one-dimensional model to calculate the spatial distribution of photo-induced carriers. In this way, the voltage response of Hg_1-xCd_xTe photoconductive detectors was calculated. The results show that the fixed surface charges can influence significantly the characteristics of the detector, whereas optimizing the fixed surface charges governed by the passivation processes can improve the performances of the device.