Computer modeling of dual-band HgCdTe photovoltaic detectors

The performance of middle wavelength/long wavelength (MW/LW) dual-band HgCd Te photovoltaic detectors was examined theoretically. An original iteration scheme was used to solve the system of nonlinear continuity equations and the Poisson equation. The effect of composition and doping profiles on the heterojunction detector parameters is presented. It is assumed that the per formance of photodiodes is due to thermal generation governed by the Auger mechanism. All quantities are functions of the electric potential and Fermi quasi-levels. The results of calculations are presented as maps showing sp atial distribution of electrical potential, photoelectrical gain, sensitivi ty, and density of noise generation. The theoretical predictions of heteroj unction device parameters are compared with available experimental data. (C ) 2001 American Institute of Physics.