Journal
NANO LETTERS
Volume 15, Issue 5, Pages 2817-2824Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5041463
Keywords
Si heterojunction photoelectrodes; oxygen evolution; hydrogen evolution; solar to oxygen conversion efficiency; solar to hydrogen conversion efficiency
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Funding
- National Science Foundation [CBET1236155]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1236155] Funding Source: National Science Foundation
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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/cm(2) at the equilibrium water oxidation potential. The SiHJ photocathode with 2 rim 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.
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