In this paper, first we simulate the light absorption of individual cylindrical nanowire with the diameter ranging from 100 to 300 nm, it is found that the absorption peak has a red-shift along with the increased diameter. Then some numerical simulations have been done to elucidate the high gain mechanism and investigate the dependence of photoconductive gain on various parameters, such as doping, surface state density, and structure. The results show that optimizing these parameters appropriately can lead photoconductive gain up to 106, and give a reliable guiding to the actual device design.
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