GaAs nanopillar arrays with suppressed broadband reflectance and high optical quality for photovoltaic applications

R. Sanatinia*, K. M. Awan, S. Naureen, N. Anttu, E. Ebraert, S. Anand

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

We report on fabrication and optical characterization of GaAs nanopillar (NP) arrays, obtained using a combination of low-cost mask generation by self-assembled silica particles (nanosphere lithography) and dry etching. Tapered structures (conical and frustum NP arrays) are fabricated by appropriate optimization of process parameters. Significant suppression of surface reflectance is observed for both geometries over a broad wavelength range. Simulations, based on finite difference time domain (FDTD) method, show good agreement with reflectivity measurements and serve as a guideline for design of NPs and understanding their interaction with light. A combination of wet chemical etching and sulfur-based passivation of GaAs NPs, results in more than one order of magnitude enhancement in PL intensity and recovery of PL line-width, which is very promising for photovoltaic applications.

Original languageEnglish
Pages (from-to)1671-1679
Number of pages9
JournalOptical Materials Express
Volume2
Issue number11
DOIs
Publication statusPublished - Nov 2012
MoE publication typeA1 Journal article-refereed

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