High-Performance a-Si/c-Si Heterojunction Photoelectrodes for Photoelectrochemical Oxygen and Hydrogen Evolution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Hsin-Ping Wang
  • Ke Sun
  • Sun Young Noh
  • Alireza Kargar
  • Meng-Lin Tsai
  • Ming-Yi Huang
  • Deli Wang

Detail(s)

Original languageEnglish
Pages (from-to)2817-2824
Journal / PublicationNano Letters
Volume15
Issue number5
Early online date9 Feb 2015
Publication statusPublished - 13 May 2015
Externally publishedYes

Abstract

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.

Research Area(s)

  • hydrogen evolution, oxygen evolution, Si heterojunction photoelectrodes, solar to hydrogen conversion efficiency, solar to oxygen conversion efficiency

Citation Format(s)

High-Performance a-Si/c-Si Heterojunction Photoelectrodes for Photoelectrochemical Oxygen and Hydrogen Evolution. / Wang, Hsin-Ping; Sun, Ke; Noh, Sun Young; Kargar, Alireza; Tsai, Meng-Lin; Huang, Ming-Yi; Wang, Deli; He, Jr-Hau.

In: Nano Letters, Vol. 15, No. 5, 13.05.2015, p. 2817-2824.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review