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Cai Y, Lu Z, Xu X, Gao Y, Shi T, Wang X, Shui L. Bandgap Engineering of Two-Dimensional Double Perovskite Cs 4AgBiBr 8/WSe 2 Heterostructure from Indirect Bandgap to Direct Bandgap by Introducing Se Vacancy. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16103668. [PMID: 37241293 DOI: 10.3390/ma16103668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 04/28/2023] [Accepted: 05/05/2023] [Indexed: 05/28/2023]
Abstract
Heterostructures based on layered materials are considered next-generation photocatalysts due to their unique mechanical, physical, and chemical properties. In this work, we conducted a systematic first-principles study on the structure, stability, and electronic properties of a 2D monolayer WSe2/Cs4AgBiBr8 heterostructure. We found that the heterostructure is not only a type-II heterostructure with a high optical absorption coefficient, but also shows better optoelectronic properties, changing from an indirect bandgap semiconductor (about 1.70 eV) to a direct bandgap semiconductor (about 1.23 eV) by introducing an appropriate Se vacancy. Moreover, we investigated the stability of the heterostructure with Se atomic vacancy in different positions and found that the heterostructure was more stable when the Se vacancy is near the vertical direction of the upper Br atoms from the 2D double perovskite layer. The insightful understanding of WSe2/Cs4AgBiBr8 heterostructure and the defect engineering will offer useful strategies to design superior layered photodetectors.
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Affiliation(s)
- Yiwei Cai
- School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
| | - Zhengli Lu
- Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou 510632, China
| | - Xin Xu
- Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou 510632, China
| | - Yujia Gao
- Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou 510632, China
| | - Tingting Shi
- Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou 510632, China
- Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Jinan University, Guangzhou 510632, China
| | - Xin Wang
- School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangzhou 510006, China
| | - Lingling Shui
- School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Device, South China Normal University, Guangzhou 510006, China
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