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Proceedings Article

Surface alkylated and metal nano-dotted n-Si electrodes for efficient and low-cost solar energy conversion

[+] Author Affiliations
Yasuhiro Nanjo, Ryuhei Nakamura, Susumu Takabayashi

Osaka Univ. (Japan)

Yoshihiro Nakato

Osaka Univ. (Japan) and CREST, Japan Science and Technology Agency (Japan)

Proc. SPIE 5938, Organic Photovoltaics VI, 59380G (October 03, 2005); doi:10.1117/12.624460
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From Conference Volume 5938

  • Organic Photovoltaics VI
  • Zakya H. Kafafi; Paul A. Lane
  • San Diego, California, United States | July 31, 2005

abstract

A surface alkylated and metal nano-dotted n-Si electrode yields an efficient and stable photovoltaic characteristic in an aqueous redox electrolyte. It generates a high photovoltage due to a unique effect of metal nano-contact and is stabilized by surface alkylation. In the present work, we have prepared a composite electrode, composed of the surface methylated and Pt nano-dotted n-Si single crystal electrode and a tungsten trioxide (WO3) particulate thin film, to decompose water into oxygen and H+ ions under solar irradiation. The onset potential of the oxygen evolution photocurrent for the composite electrode shifts to the negative by about 0.2 V compared with that for the WO3 electrode alone, indicating that the two-step, Z-scheme mechanism operates in the composite electrode, leading to generation of a high photovoltage that comes from a series sum of the photovoltage in the Si and that in the WO3. It is discussed that a composite "polycrystalline Si / visible-light responsive metal-oxide thin-film" electrode is a promising approach to high-efficiency and low-cost solar water splitting.

© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Yasuhiro Nanjo ; Ryuhei Nakamura ; Susumu Takabayashi and Yoshihiro Nakato
"Surface alkylated and metal nano-dotted n-Si electrodes for efficient and low-cost solar energy conversion", Proc. SPIE 5938, Organic Photovoltaics VI, 59380G (October 03, 2005); doi:10.1117/12.624460; http://dx.doi.org/10.1117/12.624460


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