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Proceedings Paper

Surface alkylated and metal nano-dotted n-Si electrodes for efficient and low-cost solar energy conversion
Author(s): Yasuhiro Nanjo; Ryuhei Nakamura; Susumu Takabayashi; Yoshihiro Nakato
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Paper 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.

Paper Details

Date Published: 3 October 2005
PDF: 6 pages
Proc. SPIE 5938, Organic Photovoltaics VI, 59380G (3 October 2005); doi: 10.1117/12.624460
Show Author Affiliations
Yasuhiro Nanjo, Osaka Univ. (Japan)
Ryuhei Nakamura, Osaka Univ. (Japan)
Susumu Takabayashi, Osaka Univ. (Japan)
Yoshihiro Nakato, Osaka Univ. (Japan)
CREST, Japan Science and Technology Agency (Japan)

Published in SPIE Proceedings Vol. 5938:
Organic Photovoltaics VI
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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