NDLI: Optical, electrical, and solar energy-conversion properties of gallium arsenide nanowire-array photoanodes

Content Provider	Royal Society of Chemistry (RSC)
Author	Dapkus, P. Daniel Yao, Maoqing Lewis, Nathan S. Fountaine, Katherine T. Atwater, Harry A. Chi, Chun-Yung Hu, Shu Zhou, Chongwu
Copyright Year	2013
Abstract	Periodic arrays of n-GaAs nanowires have been grown by selective-area metal–organic chemical-vapor deposition on Si and GaAs substrates. The optical absorption characteristics of the nanowire-arrays were investigated experimentally and theoretically, and the photoelectrochemical energy-conversion properties of GaAs nanowire arrays were evaluated in contact with one-electron, reversible, redox species in non-aqueous solvents. The radial semiconductor/liquid junction in the nanowires produced near-unity external carrier-collection efficiencies for nanowire-array photoanodes in contact with non-aqueous electrolytes. These anodes exhibited overall inherent photoelectrode energy-conversion efficiencies of ∼8.1% under 100 mW cm−2 simulated Air Mass 1.5 illumination, with open-circuit photovoltages of 590 ± 15 mV and short-circuit current densities of 24.6 ± 2.0 mA cm−2. The high optical absorption, and minimal reflection, at both normal and off-normal incidence of the GaAs nanowire arrays that occupy <5% of the fractional area of the electrode can be attributed to efficient incoupling into radial nanowire guided and leaky waveguide modes.
Starting Page	1879
Ending Page	1890
Page Count	12
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	6
Issue Number	6
Journal	Energy & Environmental Science
DOI	10.1039/c3ee40243f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Gallium arsenide Photoelectrochemical cell Nanowire Redox Semiconductor Electrode Waveguide
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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