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

Shu Hu, Chun Yung Chi, Katherine T. Fountaine, Maoqing Yao, Harry A. Atwater, P. Daniel Dapkus, Nathan S Lewis, Chongwu Zhou

Research output: Contribution to journalArticle

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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

Original languageEnglish
Pages (from-to)1879-1890
Number of pages12
JournalEnergy and Environmental Science
Volume6
Issue number6
DOIs
Publication statusPublished - Jun 2013

Fingerprint

gallium
Gallium arsenide
Energy conversion
Solar energy
Nanowires
Light absorption
Organic Chemicals
density current
air mass
electrolyte
Organic chemicals
Short circuit currents
Electrolytes
Conversion efficiency
gallium arsenide
energy conversion
solar energy
Chemical vapor deposition
Anodes
Current density

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering

Cite this

Hu, S., Chi, C. Y., Fountaine, K. T., Yao, M., Atwater, H. A., Dapkus, P. D., ... Zhou, C. (2013). Optical, electrical, and solar energy-conversion properties of gallium arsenide nanowire-array photoanodes. Energy and Environmental Science, 6(6), 1879-1890. https://doi.org/10.1039/c3ee40243f

Optical, electrical, and solar energy-conversion properties of gallium arsenide nanowire-array photoanodes. / Hu, Shu; Chi, Chun Yung; Fountaine, Katherine T.; Yao, Maoqing; Atwater, Harry A.; Dapkus, P. Daniel; Lewis, Nathan S; Zhou, Chongwu.

In: Energy and Environmental Science, Vol. 6, No. 6, 06.2013, p. 1879-1890.

Research output: Contribution to journalArticle

Hu, Shu ; Chi, Chun Yung ; Fountaine, Katherine T. ; Yao, Maoqing ; Atwater, Harry A. ; Dapkus, P. Daniel ; Lewis, Nathan S ; Zhou, Chongwu. / Optical, electrical, and solar energy-conversion properties of gallium arsenide nanowire-array photoanodes. In: Energy and Environmental Science. 2013 ; Vol. 6, No. 6. pp. 1879-1890.
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