Abstract
Surface photovoltage is used to study the dynamics of photogenerated carriers which are transported through a highly interconnected three-dimensional network of indium phosphide nanowires. Through the nanowire network charge transport is possible over distances far in excess of the nanowire lengths. Surface photovoltage was measured within a region 10.5–14.5 mm from the focus of the illumination, which was chopped at a range of frequencies from 15 Hz to 30 kHz. Carrier dynamics were modeled by approximating the nanowire network as a thin film, then fitted to experiment suggesting diffusion of electrons and holes at approximately 75% of the bulk value in InP but with significantly reduced built-in fields, presumably due to screening by nanowire surfaces.
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Acknowledgements
The authors would like to acknowledge Ferenc Korsos at Semilab USA LLC (Billerica, MA) for his contribution of surface photovoltage measurements. The authors are also grateful to Bio-Info-Nano R&D Institute (Moffett Field, California), University Affiliated Research Center (UARC, Moffett Field, California), Advanced Studies Laboratories (ASL, Moffett Field California), NASA Ames Research Center and Intelligent Infrastructures Laboratory at Hewlett-Packard Laboratories (Palo Alto, California) for their continuous support.
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Lohn, A.J., Kobayashi, N.P. AC surface photovoltage of indium phosphide nanowire networks. Appl. Phys. A 107, 647–651 (2012). https://doi.org/10.1007/s00339-012-6810-0
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DOI: https://doi.org/10.1007/s00339-012-6810-0