Analytical modeling and numerical simulation of P+-Hg-0.69 Cd0.31Te/n-Hg0.78Cd0.22Te/CdZnTe heterojunction photodetector for a long-wavelength infrared free space optical communication system

作者：Dwivedi A D D

来源：Journal of Applied Physics, 2011, 110(4): 043101.

DOI：10.1063/1.3615967

In this paper an analytical modeling and 2D numerical simulation of P+-Hg0.69Cd0.31Te/n-Hg0.78Cd0.22Te/CdZnTe single heterojunction photodetector using the commercially available ATLAS (TM) package from SILVACO (R) International for long-wavelength free space optical communication has been reported. The photodetector has been studied with respect to energy band diagram, electric field profile, doping profile, dark current, resistance area product, quantum efficiency, spectral response, responsivity, and detectivity by an analytical method using closed form equations. The results obtained on the basis of the analytical model have been compared and contrasted with the simulated results using ATLAS (TM). The photodetector exhibits high values of quantum efficiency similar to 80%, responsivity similar to 6.75 A/W, specific detectivity similar to 2.25 x 10(11) mHz(1/2)W(-1) at wavelength10.6 mu m, and dark current of the order of 10(-11) A. The estimated noise equivalent power (NEP) is of the order of 1 x 10(-17) W.

• 出版日期2011-8-15