Nanostructured phosphides as photoelectrode materials for artificial photosynthesis

Wen Wen; Sean M. Collins; Stephen Maldonado

doi:10.1117/12.894298

19 September 2011 Nanostructured phosphides as photoelectrode materials for artificial photosynthesis

Wen Wen, Sean M. Collins, Stephen Maldonado

Proceedings Volume 8109, Solar Hydrogen and Nanotechnology VI; 81090Y (2011) https://doi.org/10.1117/12.894298
Event: SPIE Solar Energy + Technology, 2011, San Diego, California, United States

Abstract

In this work we describe present experimental results for two related ternary phosphide materials, N-alloyed GaP and ZnGeP₂. These materials represent two potential mid-bandgap photoelectrode materials for artificial photosynthetic systems for solar energy conversion/storage. For photoelectrochemical cells designed to generate energyrich chemical fuels under illumination, candidate photoelectrode materials should demonstrate the capacity to sustain large photovoltages and photocurrent densities under solar insolation. The results in this work show that the optical properties of these two materials should enable the possibilities for light collection out past 600 nm. For N-alloyed GaP nanowire films, diffuse reflectance spectra show the increase of light absorption at sub-bandgap wavelengths with increasing NH₃(g) used during the annealing step. Corresponding photoelectrochemical data show that the quantum efficiency for light collection at sub-bandgap wavelengths does not follow the same monotonic trend. Separately, we report the first demonstration of ZnGeP₂ nanowire films. The as-prepared materials show reflectance responses consistent with a mid-bandgap material featuring a pseudo-direct bandgap.

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Wen Wen, Sean M. Collins, and Stephen Maldonado "Nanostructured phosphides as photoelectrode materials for artificial photosynthesis", Proc. SPIE 8109, Solar Hydrogen and Nanotechnology VI, 81090Y (19 September 2011); https://doi.org/10.1117/12.894298

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KEYWORDS

Nanowires

Annealing

Quantum efficiency

Solar energy

Reflectivity

Quartz

Absorption

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