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19 February 2021 Study on the optical characteristics of gradient Al component AlGaN nanowires for ultraviolet photocathode
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Abstract

We numerically studied the effect of the geometric structure and Al component on the optical capture performance of gradient Al component AlxGa1  −  xN photocathodes. The effects of geometric parameters, such as base radius (R), wire-to-wire spacing, cone rate, and angle of incident light, on the optical response were systematically studied based on the finite element method. In the radial direction, we study the optical response of rectangular periodic structure and hexagonal periodic structure. Simulation results show that pencil nanostructure can achieve omnidirectional and broadband light absorption of AlxGa1  −  xN nanowires with hexagonal periodic structure. In addition, we used the Spicer three-step emission model to establish the photoemission efficiency of the AlxGa1  −  xN nanostructure. As a result, the photocathode achieves optimal quantum efficiency when the Al component is in the range of 0 to 0.75 and sublayer thickness of 240, 180, 120, and 60 nm.

© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE) 1947-7988/2021/$28.00 © 2021 SPIE
Zhisheng Lv, Lei Liu, Xingyue Zhangyang, Feifei Lu, and Jian Tian "Study on the optical characteristics of gradient Al component AlGaN nanowires for ultraviolet photocathode," Journal of Photonics for Energy 11(1), 014501 (19 February 2021). https://doi.org/10.1117/1.JPE.11.014501
Received: 17 November 2020; Accepted: 28 January 2021; Published: 19 February 2021
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