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Defects Passivation With Dithienobenzodithiophene‐based π‐conjugated Polymer for Enhanced Performance of Perovskite Solar Cells
Author(s) -
Li Xianqiang,
Li Wenhui,
Yang Yijie,
Lai Xue,
Su Qiang,
Wu Dan,
Li Gongqiang,
Wang Kai,
Chen Shuming,
Sun Xiao Wei,
Kyaw Aung Ko Ko
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900029
Subject(s) - passivation , perovskite (structure) , materials science , polymer , energy conversion efficiency , conjugated system , chemical engineering , carrier lifetime , photovoltaics , optoelectronics , nanotechnology , photovoltaic system , silicon , composite material , layer (electronics) , ecology , engineering , biology
A dithienobenzodithiophene‐based π‐conjugated polymer consisting of fluorinated benzotriazole and benzothiadiazole is successfully applied through anti‐solvent method to passivate the defects of perovskite crystals. The fluorinated polymer interacts with under coordinated Pb 2+ ions in the perovskite crystals to form Pb‐F bond which effectively passivates the defects. The trap density is reduced and the charge carrier transfer between the perovskite film and Spiro‐OMeTAD is also improved after passivation with the polymer. As a result, a power conversion efficiency (PCE) of 18.03% is achieved in the champion cell. After storing in an ambient environment with 60% relative humidity for 1000 h, the device still retains 90% of the original PCE. These results demonstrate that dithienobenzodithiophene‐based π‐conjugated polymers are promising materials for passivation of perovskite films to further improve the performance and stability of perovskite solar cells.