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Title: Broadband-antireflective hybrid nanopillar array for photovoltaic application

Subwavelength structures such as nanopillars, nanoholes, and nanodomes have recently attracted considerable attention as antireflective structures for solar cells. Recent studies on the optical property of nanopillar array revealed that the reflection minimum is related to the diameter, the pitch, and the height of nanopillars. Here, we investigate the “hybrid” nanopillar array, which is composed of different diameters of nanopillars. Finite differential time domain simulations revealed that the photogeneration in a hybrid nanopillar array is spatially heterogeneous: carriers are generated mainly in the narrower pillars for short-wavelength incident light and in the thicker pillars for long-wavelength light, respectively. Hybrid silicon nanopillar arrays fabricated by using electron beam lithography and dry etching show excellent broadband antireflection property. Hybrid nanopillar array is thus highly promising for next-generation antireflection for photovoltaic applications.
Authors:
; ;  [1]
  1. Central Research Laboratory, Hitachi, Ltd., 1-280 Higashikoigakubo, Kokubunji, Tokyo 185-8601 (Japan)
Publication Date:
OSTI Identifier:
22494800
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 14 SOLAR ENERGY; CARRIERS; COMPUTERIZED SIMULATION; ELECTRON BEAMS; ETCHING; HYBRID SYSTEMS; NANOSTRUCTURES; OPTICAL PROPERTIES; PHOTOVOLTAIC EFFECT; REFLECTION; SILICON; SOLAR CELLS; TIME DEPENDENCE; VISIBLE RADIATION; WAVELENGTHS