期刊
ADVANCED MATERIALS
卷 33, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202100791
关键词
charge transfer; organic semiconductors; perovskite solar cells; stability; surface passivation
类别
资金
- US Office of Naval Research [N00014-19-1-2296]
- Davidson School of Chemical Engineering
- College of Engineering of Purdue University
- Lillian Gilbreth Postdoctoral Fellowship from College of Engineering of Purdue University
- US Department of Energy, Office of Basic Energy Sciences [DE-SC0016356]
- U.S. Department of Energy [DE-SC0018208]
- U.S. Department of Energy (DOE) [DE-SC0018208] Funding Source: U.S. Department of Energy (DOE)
A novel multifunctional semiconducting organic ammonium cationic interface modifier is reported to boost the efficiency and stability of perovskite solar cells, achieving an excellent power conversion efficiency of 22.06%. By improving energy level alignment and stabilizing the interface, ion migration and halide phase segregation are suppressed, leading to long-term operational stability.
Surface passivation is an effective way to boost the efficiency and stability of perovskite solar cells (PSCs). However, a key challenge faced by most of the passivation strategies is reducing the interface charge recombination without imposing energy barriers to charge extraction. Here, a novel multifunctional semiconducting organic ammonium cationic interface modifier inserted between the light-harvesting perovskite film and the hole-transporting layer is reported. It is shown that the conjugated cations can directly extract holes from perovskite efficiently, and simultaneously reduce interface non-radiative recombination. Together with improved energy level alignment and the stabilized interface in the device, a triple-cation mixed-halide medium-bandgap PSC with an excellent power conversion efficiency of 22.06% (improved from 19.94%) and suppressed ion migration and halide phase segregation, which lead to a long-term operational stability, is demonstrated. This strategy provides a new practical method of interface engineering in PSCs toward improved efficiency and stability.
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