High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity

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There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the ... continued below

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Hwang, Yun Jeong; Boukai, Akram & Yang, Peidong November 15, 2008.

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There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the heterojunction.

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  • Journal Name: American Chemical Society-Nano Letters; Journal Volume: 9; Journal Issue: 1; Related Information: Journal Publication Date: 12/01/2008

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  • Report No.: LBNL-1951E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 960435
  • Archival Resource Key: ark:/67531/metadc933946

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Office of Scientific & Technical Information Technical Reports

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  • November 15, 2008

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  • Nov. 13, 2016, 7:26 p.m.

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  • Oct. 2, 2017, 5:04 p.m.

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Hwang, Yun Jeong; Boukai, Akram & Yang, Peidong. High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity, article, November 15, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc933946/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.