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Xing Y, Deng Z, Wang Q, Xiong J, Liu X, Huang L, Zhu Y, Zhang J. Polymer Lewis Base for Improving the Charge Transfer in Tin-Lead Mixed Perovskite Solar Cells. Nanomaterials (Basel) 2024; 14:437. [PMID: 38470768 DOI: 10.3390/nano14050437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 02/22/2024] [Accepted: 02/25/2024] [Indexed: 03/14/2024]
Abstract
The poor film stability of Sn-Pb mixed perovskite film and the mismatched interface energy levels pose significant challenges in enhancing the efficiency of tin-lead (Sn-Pb) mixed perovskite solar cells. In this study, polyvinylpyrrolidone (PVP) is introduced into the PVK perovskite precursor solution, effectively enhancing the overall stability of the film. This improvement is achieved through the formation of robust coordination bonds between the carbonyl (C=O) in the pyrrole ring and the undercoordinated SnII and PbII, thereby facilitating the passivation of defects. Furthermore, the introduction of PVP inhibits the oxidation of tin (Sn), thereby enhancing the n-type characteristics of the perovskite film. This adjustment in the energy level of the PVK perovskite film proves instrumental in reducing interface energy loss, subsequently improving interface charge transfer and mitigating device recombination. Consequently, perovskite solar cells incorporating PVP achieve an outstanding champion power conversion efficiency (PCE) of 21.31%.
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Affiliation(s)
- Yanjun Xing
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
| | - Zhiqiang Deng
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
| | - Qiuxiang Wang
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
| | - Jiaxing Xiong
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
| | - Xiaohui Liu
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
| | - Like Huang
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
| | - Yuejin Zhu
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
- School of Information Engineering, College of Science and Technology, Ningbo University, Ningbo 315300, China
| | - Jing Zhang
- Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
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Cao J, Loi HL, Xu Y, Guo X, Wang N, Liu CK, Wang T, Cheng H, Zhu Y, Li MG, Wong WY, Yan F. High-Performance Tin-Lead Mixed-Perovskite Solar Cells with Vertical Compositional Gradient. Adv Mater 2022; 34:e2107729. [PMID: 34676933 DOI: 10.1002/adma.202107729] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 10/14/2021] [Indexed: 06/13/2023]
Abstract
Sn-Pb mixed perovskites with bandgaps in the range of 1.1-1.4 eV are ideal candidates for single-junction solar cells to approach the Shockley-Queisser limit. However, the efficiency and stability of Sn-Pb mixed-perovskite solar cells (PSCs) still lag far behind those of Pb-based counterparts due to the easy oxidation of Sn2+ . Here, a reducing agent 4-hydrazinobenzoic acid is introduced as an additive along with SnF2 to suppress the oxidation of Sn2+ . Meanwhile, a vertical Pb/Sn compositional gradient is formed spontaneously after an antisolvent treatment due to different solubility and crystallization kinetics of Sn- and Pb-based perovskites and it can be finely tuned by controlling the antisolvent temperature. Because the band structure of a perovskite is dependent on its composition, graded vertical heterojunctions are constructed in the perovskite films with a compositional gradient, which can enhance photocarrier separation and suppress carrier recombination in the resultant PSCs. Under optimal fabrication conditions, the Sn-Pb mixed PSCs show power conversion efficiency up to 22% along with excellent stability during light soaking.
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Affiliation(s)
- Jiupeng Cao
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Hok-Leung Loi
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Yang Xu
- Division of Integrative Systems and Design, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, P. R. China
| | - Xuyun Guo
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Naixiang Wang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Chun-Ki Liu
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Tianyue Wang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Haiyang Cheng
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Ye Zhu
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
| | - Mitch Guijun Li
- Division of Integrative Systems and Design, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, P. R. China
| | - Wai-Yeung Wong
- Research Institute of Intelligent Wearable Systems, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
- Department of Applied Biology & Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hong Kong, P. R. China
| | - Feng Yan
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
- Research Institute of Intelligent Wearable Systems, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China
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