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

Yasuhiro Nanjo; Ryuhei Nakamura; Susumu Takabayashi; Yoshihiro Nakato

doi:10.1117/12.624460

3 October 2005 Surface alkylated and metal nano-dotted n-Si electrodes for efficient and low-cost solar energy conversion

Yasuhiro Nanjo, Ryuhei Nakamura, Susumu Takabayashi, Yoshihiro Nakato

Author Affiliations +

Proceedings Volume 5938, Organic Photovoltaics VI; 59380G (2005) https://doi.org/10.1117/12.624460
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

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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 (3 October 2005); https://doi.org/10.1117/12.624460

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KEYWORDS

Electrodes

Platinum

Composites

Silicon

Thin films

Metals

Oxides

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