Journal
ACS ENERGY LETTERS
Volume 5, Issue 10, Pages 3159-3167Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01664
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Funding
- European Union's Horizon 2020 research and innovation programme [764047]
- Swiss National Science Foundation [200020_185041]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1F1A1075558]
- H2020 Societal Challenges Programme [764047] Funding Source: H2020 Societal Challenges Programme
- Swiss National Science Foundation (SNF) [200020_185041] Funding Source: Swiss National Science Foundation (SNF)
- National Research Foundation of Korea [2020R1F1A1075558] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Nonradiative recombination is a major limiting factor in obtaining efficient metal-halide perovskite photovoltaics. Here, a passivation treatment is developed by applying a mixture of a new ammonium salt, CF3(CF2)(2)CH2NH3I (HBAI), and a conventional formamidinium halide, FAX, on top of the 3D perovskite bulk film. The introduction of such an optimized passivation layer effectively suppressed charge recombination by passivating the surface traps of the 3D perovskite film, enabling a well-matched energy alignment at the interface of perovskite/HTM, leading to a high power conversion efficiency (PCE) of over 23% from current-voltage (1-0 measurements and a stabilized 22.7% PCE, owing to a substantial V-OC improvement (above 80 mV on average), coupled with an improved stability.
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