期刊
ADVANCED MATERIALS
卷 34, 期 41, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202205268
关键词
interface engineering; nonconjugated polymers; nonradiative recombination; organometal halide perovskites; perovskite solar cells
类别
资金
- Global Research Laboratory (GRL) Program of the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning (MSIP) [NRF-2017K1A1A2013153]
- Technology Development Program to Solve Climate Change of the NRF - MSIT [NRF-2020M1A2A2080748]
- program of Future Hydrogen Original Technology Development through the NRF - MSIT [2021M313A1084747]
- Basic Science Research Program through the NRF - Ministry of Education [2020R1I1A3061306, 2022R1A6A3A13055321]
- GIST Research Institute (GRI, RISE) - GIST
- National Research Foundation of Korea [2022R1A6A3A13055321, PAL-2022, 2020R1I1A3061306] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a new nonconjugated polyelectrolyte (poly-BCP) was synthesized and introduced as a passivation layer between tin oxide and organometal halide perovskite. It effectively suppressed nonradiative recombination, resulting in improved efficiency and stability of solar cells.
Suppressing nonradiative recombination at the interface between the organometal halide perovskite (PVK) and the charge-transport layer (CTL) is crucial for improving the efficiency and stability of PVK-based solar cells (PSCs). Here, a new bathocuproine (BCP)-based nonconjugated polyelectrolyte (poly-BCP) is synthesized and this is introduced as a dual-side passivation layer between the tin oxide (SnO2) CTL and the PVK absorber. Poly-BCP significantly suppresses both bulk and interfacial nonradiative recombination by passivating oxygen-vacancy defects from the SnO2 side and simultaneously scavenges ionic defects from the other (PVK) side. Therefore, PSCs with poly-BCP exhibits a high power conversion efficiency (PCE) of 24.4% and a high open-circuit voltage of 1.21 V with a reduced voltage loss (PVK bandgap of 1.56 eV). The non-encapsulated PSCs also show excellent long-term stability by retaining 93% of the initial PCE after 700 h under continuous 1-sun irradiation in nitrogen atmosphere conditions.
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