High-performance a -Si/c-Si heterojunction photoelectrodes for photoelectrochemical oxygen and hydrogen evolution

Hsin Ping Wang, Ke Sun, Sun Young Noh, Alireza Kargar, Meng-Lin Tsai, Ming Yi Huang, Deli Wang, Jr-Hau He

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84 Scopus citations


Amorphous Si (a-Si)/crystalline Si (c-Si) heterojunction (SiHJ) can serve as highly efficient and robust photoelectrodes for solar fuel generation. Low carrier recombination in the photoelectrodes leads to high photocurrents and photovoltages. The SiHJ was designed and fabricated into both photoanode and photocathode with high oxygen and hydrogen evolution efficiency, respectively, by simply coating of a thin layer of catalytic materials. The SiHJ photoanode with sol-gel NiOx as the catalyst shows a current density of 21.48 mA/cm2 at the equilibrium water oxidation potential. The SiHJ photocathode with 2 nm sputter-coated Pt catalyst displays excellent hydrogen evolution performance with an onset potential of 0.640 V and a solar to hydrogen conversion efficiency of 13.26%, which is the highest ever reported for Si-based photocathodes. © 2015 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)2817-2824
Number of pages8
JournalNano Letters
Issue number5
StatePublished - Apr 6 2015

ASJC Scopus subject areas

  • Bioengineering
  • General Materials Science
  • General Chemistry
  • Mechanical Engineering
  • Condensed Matter Physics


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