InGaAs-Based Square-Shaped Nanopillar Array for High Photodetector Performance

Nanopillar arrays over the photodetector’s surface ensure a greater injection of incident light by enhancing light trapping phenomenon due to multiple reflections from the nanopillars which contribute towards high-resolution optical communication. This paper reports the analytical investigation of the Indium Gallium Arsenide material based square-shaped nanopillar (NP) array over the detector’s front surface for high-performance photodetection. The proposed structure exhibits an optimum 98% overall absorption of the incoming light. High EQE of about 55% and responsivity of 0.7 A/W has been obtained in 1.5 um operating wavelength range with a minimum depletion width of 0.65 um.