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Dual Coordination of Ti and Pb Using Bilinkable Ligands Improves Perovskite Solar Cell Performance and Stability
Author(s) -
Tan Furui,
Saidaminov Makhsud I.,
Tan Hairen,
Fan James Z.,
Wang Yuhang,
Yue Shizhong,
Wang Xiaotian,
Shen Zhitao,
Li Shengjun,
Kim Junhwan,
Gao Yueyue,
Yue Gentian,
Liu Rong,
Huang Ziru,
Dong Chen,
Hu Xiaodong,
Zhang Weifeng,
Wang Zhijie,
Qu Shengchun,
Wang Zhanguo,
Sargent Edward H.
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202005155
Subject(s) - passivation , perovskite (structure) , materials science , heterojunction , energy conversion efficiency , solar cell , perovskite solar cell , recombination , thiophene , density functional theory , optoelectronics , nanotechnology , chemical engineering , computational chemistry , chemistry , organic chemistry , biochemistry , layer (electronics) , engineering , gene
Charge recombination due to interfacial defects is an important source of loss in perovskite solar cells. Here, a two‐sided passivation strategy is implemented by incorporating a bilinker molecule, thiophene‐based carboxylic acid (TCA), which passivates defects on both the perovskite side and the TiO 2 side of the electron‐extracting heterojunction in perovskite solar cells. Density functional theory and ultrafast charge dynamics reveal a 50% reduction in charge recombination at this interface. Perovskite solar cells made using TCA‐passivated heterojunctions achieve a power conversion efficiency of 21.2% compared to 19.8% for control cells. The TCA‐containing cells retain 96% of initial efficiency following 50 h of UV‐filtered MPP testing.