Journal
JOULE
Volume 6, Issue 5, Pages 1032-1048Publisher
CELL PRESS
DOI: 10.1016/j.joule.2022.04.002
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [12104081]
- NSFC [21725305, 51872036, 51773025]
- special funds of central government guide local for scientific and technological development [2021JH6/10500152]
- National Research Foundation of Korea (NRF) - Korea Government (MSIT) [2022R1C1C1011975, 2021R1I1A1A01050938]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea Government (MOTIE) [20214000000640, 20213030010400]
- Leaders in Industry-university Cooperation+ Project - Ministry of Education
- NRF
- Korea Institute of Energy Technology Evaluation & Planning (KETEP) [20214000000640, 20213030010400] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2022R1C1C1011975, 2021R1I1A1A01050938] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study investigates the structural effects of different polymeric modification agents on perovskite solar cells. It is found that polyvinyl acetate exhibits the strongest electron-donating ability and effectively passivates defects, leading to enhanced carrier diffusion.
Tedious trial-and-error procedures are commonly practiced for surface modification of the perovskite solar cell (PSC) active layers. A guideline to rationally choose the passivating functional groups of the polymeric structure that is eminently effective in passivating the charged defects and elongating the device lifetime is hence in urgent demand, Herein, three prototypical polymers, polyvinyl acetate) (PVA), polyethylene glycol (PEG), and poly(9-vinylcarbazole) (PVK), are selected to investigate the structural effect of the polymeric modification agents on the PSCs. We found that PVA possesses the Lewis base functional group with the minimized steric hindrance and the strongest electron-donating ability, enabling the most effective defect passivation on the perovskite film surface and the most enhanced carrier diffusion capacity. It demonstrates a power conversion efficiency (PCE) of 23.20% and noticeably enhanced operational stability. Our work provides important insights toward the selection of polymeric modification agents for high-performance and long-term stable PSCs.
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