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Du L, An J, Katayama T, Duan M, Shi X, Wang Y, Furube A. Photogenerated carrier dynamics of Mn2+ doped CsPbBr3 assembled with TiO2 systems: Effect of Mn doping content. J Chem Phys 2024; 160:164713. [PMID: 38656441 DOI: 10.1063/5.0197068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 04/07/2024] [Indexed: 04/26/2024] Open
Abstract
In recent years, all-inorganic perovskite materials have become an ideal choice for new thin film solar cells due to their excellent photophysical properties and have become a research hotspot. Studying the ultrafast dynamics of photo-generated carriers is of great significance for further improving the performance of such devices. In this work, we focus on the transient dynamic process of CsPbBr3/TiO2 composite systems with different Mn2+ doping contents using femtosecond transient absorption spectroscopy technology. We used singular value decomposition and global fitting to analyze the transient absorption spectra and obtained three components, which are classified as hot carrier cooling, charge transfer, and charge recombination processes, respectively. We found that the doping concentration of Mn2+ has an impact on all three processes. We think that the following two factors are responsible: one is the density of defect states and the other is the bandgap width of perovskite. As the concentration of doped Mn2+ increases, the charge transfer time constant shows a trend of initially increasing, followed by a subsequent decrease, reaching a turning point. This indicates that an appropriate amount of Mn2+ doping can effectively improve the photoelectric performance of solar cell systems. We proposed a possible charge transfer mechanism model and further elucidated the microscopic mechanism of the effect of Mn2+ doping on the interface charge transfer process of the CsPbBr3/TiO2 solar cell system.
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Affiliation(s)
- Luchao Du
- Institute of Atomic and Molecular Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Jie An
- Institute of Atomic and Molecular Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Tetsuro Katayama
- Institute of Post-LED Photonics, Tokushima University, 2-1, Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Menghan Duan
- Institute of Atomic and Molecular Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - XiaoPing Shi
- Institute of Atomic and Molecular Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Yunpeng Wang
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
| | - Akihiro Furube
- Institute of Post-LED Photonics, Tokushima University, 2-1, Minamijosanjima-cho, Tokushima 770-8506, Japan
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