TY - JOUR
T1 - Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells
AU - Ma, Ke
AU - Atapattu, Harindi R.
AU - Zhao, Qiuchen
AU - Gao, Yao
AU - Finkenauer, Blake P.
AU - Wang, Kang
AU - Chen, Ke
AU - Park, So Min
AU - Coffey, Aidan H.
AU - Zhu, Chenhui
AU - Huang, Libai
AU - Graham, Kenneth R.
AU - Mei, Jianguo
AU - Dou, Letian
N1 - Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/8/12
Y1 - 2021/8/12
N2 - 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.
AB - 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.
KW - charge transfer
KW - organic semiconductors
KW - perovskite solar cells
KW - stability
KW - surface passivation
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U2 - 10.1002/adma.202100791
DO - 10.1002/adma.202100791
M3 - Article
C2 - 34219297
AN - SCOPUS:85109180951
SN - 0935-9648
VL - 33
JO - Advanced Materials
JF - Advanced Materials
IS - 32
M1 - 2100791
ER -