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

Research output: Contribution to journalConference articlepeer-review


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 (WO 3) 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.

Original languageEnglish
Article number59380G
Pages (from-to)1-6
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2005 Dec 1
EventOrganic Photovoltaics VI - San Diego, CA, United States
Duration: 2005 Aug 22005 Aug 4


  • Hydrogen
  • Nano particle
  • Oxygen
  • Photocatalysis
  • Photoelectrochemistry
  • Solar energy
  • Surface modification
  • Thin film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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