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Title: Exploring the effective photon management by InP nanoparticles: Broadband light absorption enhancement of InP/In{sub 0.53}Ga{sub 0.47}As/InP thin-film photodetectors

High-index dielectric and semiconductor nanoparticles with the characteristics of low absorption loss and strong scattering have attracted more and more attention for improving performance of thin-film photovoltaic devices. In this paper, we focus our attention on InP nanoparticles and study the influence of the substrate and the geometrical configurations on their scattering properties. We demonstrate that, compared with the InP sphere, the InP cylinder has higher coupling efficiency due to the stronger interactions between the optical mode in the nanoparticle and its induced mirror image in the substrate. Moreover, we propose novel thin-film InGaAs photodetectors integrated with the periodically arranged InP nanoparticles on the substrate. Broadband light absorption enhancement is achieved over the wavelength range between 1.0 μm and 1.7 μm. The highest average absorption enhancement of 59.7% is realized for the photodetector with the optimized cylinder InP nanoparticles. These outstanding characteristics attribute to the preferentially forward scattering of single InP nanoparticle along with the effective coupling of incident light into the guided modes through the collective diffraction effect of InP nanoparticles array.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. Nano-optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China)
  2. School of Physics and Optoelectronic Engineering, Xidian University, Xi'an, Shannxi 710071 (China)
Publication Date:
OSTI Identifier:
22410240
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; COUPLING; DIELECTRIC MATERIALS; DIFFRACTION; EFFICIENCY; GALLIUM ARSENIDES; HETEROJUNCTIONS; INDIUM ARSENIDES; INDIUM PHOSPHIDES; NANOPARTICLES; OPTICAL MODES; PHOTODETECTORS; PHOTOVOLTAIC EFFECT; SEMICONDUCTOR MATERIALS; SUBSTRATES; THIN FILMS; VISIBLE RADIATION