Effects of geometric parameters on optical absorption characteristics of InGaN nanostructured arrays

Abstract

In recent years, with the development of wide-spectrum response photodetectors, InGaN as a semiconducting material has been widely studied. The nanowire array structure has excellent trapping ability, but different structures and shapes have different absorption abilities. It is necessary to optimize the nanowire array continuously in order to obtain the highest absorption efficiency possible. Based on this background, we study the effects of the geometry and structural parameters of InGaN nanowires on the optical response properties. We define the cone ratio and fill factor, respectively, and compare the optical absorption characteristics of InGaN nanowires by using the finite difference time domain (FDTD) method. The calculation results show that the truncated nanocone arrays can enhance the light capture ability and obtain the high sensitivity of the cut-off wavelength. Its optical absorption is at least 15% higher than that of nanowires. Therefore, the research of this paper can provide a certain theoretical reference for the experiment and preparation of InGaN photocathode.

Enhanced Photoemission Performance of InGaN Inclined Nanowire Array

“…These are mainly attributed to the trapping effect of nanostructures. 21,22 Zhangyang et al Under bias voltage, it can achieve a photocurrent efficiency of 13.75%, which is much higher than in previous reports. 24 Chen et al successfully grew InGaN NWA on the inclined pyramid substrate.…”

“…In order to absorb solar energy as high as possible, nanostructures of different shapes have been continuously developed. − More and more research results have shown that InGaN nanostructures can achieve higher incident light absorption through antireflection. These are mainly attributed to the trapping effect of nanostructures. , Zhangyang et al used first-principles to calculate the electrical and optical properties of InGaN NWA structures under different In components. They found that NWs have better light absorption compared to thin film structures.…”