Volume 20, Issue 31 2311644
Research Article

Designing Atomic Interface in Sb2S3/CdS Heterojunction for Efficient Solar Water Splitting

Minji Yang

Minji Yang

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 China

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Zeyu Fan

Zeyu Fan

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 China

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Jinyan Du

Jinyan Du

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 China

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Chao Feng

Chao Feng

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 China

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Ronghua Li

Ronghua Li

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 China

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Beibei Zhang

Beibei Zhang

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 China

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Nadiia Pastukhova

Nadiia Pastukhova

Materials Research Laboratory, University of Nova Gorica, Vipavska 13, Nova Gorica, SI-5000 Slovenia

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Matjaz Valant

Matjaz Valant

Materials Research Laboratory, University of Nova Gorica, Vipavska 13, Nova Gorica, SI-5000 Slovenia

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Matjaž Finšgar

Matjaž Finšgar

Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, Maribor, SI-2000 Slovenia

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Andraž Mavrič

Corresponding Author

Andraž Mavrič

Materials Research Laboratory, University of Nova Gorica, Vipavska 13, Nova Gorica, SI-5000 Slovenia

E-mail: [email protected]; [email protected]

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Yanbo Li

Corresponding Author

Yanbo Li

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 China

E-mail: [email protected]; [email protected]

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First published: 08 March 2024
Citations: 13

Abstract

In the emerging Sb2S3-based solar energy conversion devices, a CdS buffer layer prepared by chemical bath deposition is commonly used to improve the separation of photogenerated electron-hole pairs. However, the cation diffusion at the Sb2S3/CdS interface induces detrimental defects but is often overlooked. Designing a stable interface in the Sb2S3/CdS heterojunction is essential to achieve high solar energy conversion efficiency. As a proof of concept, this study reports that the modification of the Sb2S3/CdS heterojunction with an ultrathin Al2O3 interlayer effectively suppresses the interfacial defects by preventing the diffusion of Cd2+ cations into the Sb2S3 layer. As a result, a water-splitting photocathode based on Ag:Sb2S3/Al2O3/CdS heterojunction achieves a significantly improved half-cell solar-to-hydrogen efficiency of 2.78% in a neutral electrolyte, as compared to 1.66% for the control Ag:Sb2S3/CdS device. This work demonstrates the importance of designing atomic interfaces and may provide a guideline for the fabrication of high-performance stibnite-type semiconductor-based solar energy conversion devices.

Conflict of Interest

There are no conflicts to declare.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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