Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 122, Issue 10, Pages 5462-5471Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b11747
Keywords
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Funding
- BioSolar Cells open innovation consortium
- Dutch Ministry of Economic Affairs, Agriculture and Innovation
- ERC starting grant Nano-EnabledPV [337328]
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Metal insulator semiconductor (MIS) photoelectrodes offer a simple alternative to the traditional semiconductor liquid junction and the conventional p-n junction electrode. Highly efficient MIS photoanodes require interfacial surface passivating oxides and high workfunction metals to produce a high photovoltage. Herein, we investigate and analyze the effect of interfacial oxides and metal workfunctions on the barrier height and the photovoltage of a c-Si photoanode. We use two metal components in a bimetal contact configuration and observe the modulation of the effective barrier height and the resulting photovoltage as a function of the secondary outer metal. The photovoltage shows a strong linear dependence by increasing the inner metal workfunction, with the highest photovoltage achieved by a MIS photoanode using a platinum inner metal. We also found that coupling a thin aluminium oxide with an interfacial silicon oxide and controlling the oxide thickness can significantly improve the photovoltage of an MIS junction photoanode.
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