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Wu DT, Zhu WX, Dong Y, Daboczi M, Ham G, Hsieh HJ, Huang CJ, Xu W, Henderson C, Kim JS, Eslava S, Cha H, Macdonald TJ, Lin CT. Enhancing the Efficiency and Stability of Tin-Lead Perovskite Solar Cells via Sodium Hydroxide Dedoping of PEDOT:PSS. Small Methods 2024:e2400302. [PMID: 38634222 DOI: 10.1002/smtd.202400302] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 04/09/2024] [Indexed: 04/19/2024]
Abstract
Tin-lead (Sn-Pb) perovskite solar cells (PSCs) have gained interest as candidates for the bottom cell of all-perovskite tandem solar cells due to their broad absorption of the solar spectrum. A notable challenge arises from the prevalent use of the hole transport layer, PEDOT:PSS, known for its inherently high doping level. This high doping level can lead to interfacial recombination, imposing a significant limitation on efficiency. Herein, NaOH is used to dedope PEDOT:PSS, with the aim of enhancing the efficiency of Sn-Pb PSCs. Secondary ion mass spectrometer profiles indicate that sodium ions diffuse into the perovskite layer, improving its crystallinity and enlarging its grains. Comprehensive evaluations, including photoluminescence and nanosecond transient absorption spectroscopy, confirm that dedoping significantly reduces interfacial recombination, resulting in an open-circuit voltage as high as 0.90 V. Additionally, dedoping PEDOT:PSS leads to increased shunt resistance and high fill factor up to 0.81. As a result of these improvements, the power conversion efficiency is enhanced from 19.7% to 22.6%. Utilizing NaOH to dedope PEDOT:PSS also transitions its nature from acidic to basic, enhancing stability and exhibiting less than a 7% power conversion efficiency loss after 1176 h of storage in N2 atmosphere.
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Affiliation(s)
- Dong-Tai Wu
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung, 402-27, Taiwan
| | - Wen-Xian Zhu
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung, 402-27, Taiwan
| | - Yueyao Dong
- School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK
| | - Matyas Daboczi
- Department of Chemical Engineering and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Gayoung Ham
- Department of Energy Convergence and Climate Change, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Hsing-Jung Hsieh
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung, 402-27, Taiwan
| | - Chi-Jing Huang
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung, 402-27, Taiwan
| | - Weidong Xu
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Charlie Henderson
- Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Ji-Seon Kim
- Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Salvador Eslava
- Department of Chemical Engineering and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Hyojung Cha
- Department of Energy Convergence and Climate Change, Kyungpook National University, Daegu, 41566, Republic of Korea
- Department of Hydrogen and Renewable Energy, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Thomas J Macdonald
- School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK
| | - Chieh-Ting Lin
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung, 402-27, Taiwan
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung City, 402, Taiwan
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