GaAs Periodic Half Octagonal Cut Based Nano Texturized Hexagonal Shaped Nanopillar Array Structure for Highly Responsivephotodetector’s Performance

Abstract

Efficient light absorption is the most crucial factor for high spectral responsive photodetection phenomenon. Nanopillars for photodetection constitute a great opportunity in enhancing the light absorption efficiency along with reducing the electrical cross-section of the device. Here an analytical investigation of a proposed periodic GaAs material based half octagonal cut based vertically oriented hexagonal nanopillar array deployed over a 5um x 5um front detector’s surface has been done for attaining an optimum light absorbance by reducing the surface reflectivity of the incoming photons. The geometrical analysis of the proposed model exhibits a 0.999 absorbance and 0.97A/W photoresponsivity along with 86% EQE at 1um operating wavelength.

Analytical investigation of CdSe/CdS/ZnSe‐based single‐core double‐shell nanotextured vertical nanopillar array antenna for broadband photodetection applications

“…The multiple-reflection phenomenon undergone within the array allows the incoming photons to increase their optical path length inside the nanopillar structure minimizing the reflection losses as compared to the planar front surface-based photodetector. The author's prior work [31][32][33][34] demonstrated different nanotextured pattern adopted over III-V material-based vertical nanopillar antennas for high light absorption efficiency and responsivity. However, nanotexturization pattern deployed over the core-double-layered shell hexagonal vertical nanopillar structure for attaining high photoresponsivity has not been explored in a wider length.…”