Stable CdTe Photoanodes with Energetics Matching Those of a Coating Intermediate Band
Source abstract
Abstract
A TiO2 coating was grown on a CdTe absorber by atomic layer deposition for stabilization against its photocorrosion during photoelectrochemical water splitting. Under simulated sunlight (AM 1.5G, 100 mW cm–2), this multilayer CdS/CdTe/TiO2/Ni/NiOx photoanode produced a light-limited photocurrent density of 24.5 ± 0.5 mA cm–2 and a photovoltage of 780 ± 20 mV. This record energy-conversion performance was comparable to those of baseline CdS/CdTe solar cells and was achieved only after the development of proper CdTe surface treatments prior to coating the stabilization layer. The TiO2 coating, with its in-gap charge-transport intermediate band, facilitates hole transport as light exits the CdTe/TiO2 interface. With proper interfacial chemistry, the electrochemical potential energy of the coating intermediate band matched that of the CdTe valence band. Moreover, the stabilized CdS/CdTe/TiO2/Ni/NiOx photoanodes showed 100 h stability for water oxidation under light-on/light-off cycles. This study provides insightful guidance for designing stabilization contacts for efficient and stable light-driven water oxidation.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Quantum Dots Synthesis And Properties · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511, United States
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Shanxi 710049, China
Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, United States
National Renewable Energy Laboratory, Golden, Colorado 80401, United States
Funding
Ministry of Science and Technology of the People's Republic of China · Office of Energy Efficiency and Renewable Energy · National Renewable Energy Laboratory · China Scholarship Council · Yale Energy Sciences Institute
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