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Delicate Morphology Control Triggers 14.7% Efficiency All‐Small‐Molecule Organic Solar Cells
Author(s) -
Tang Hua,
Chen Haiyan,
Yan Cenqi,
Huang Jiaming,
Fong Patrick W. K.,
Lv Jie,
Hu Dingqin,
Singh Ranbir,
Kumar Manish,
Xiao Zeyun,
Kan Zhipeng,
Lu Shirong,
Li Gang
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202001076
Subject(s) - crystallinity , materials science , morphology (biology) , organic solar cell , active layer , small molecule , phase (matter) , photovoltaic system , chemical engineering , molecule , absorption (acoustics) , nanotechnology , layer (electronics) , optoelectronics , polymer , composite material , organic chemistry , chemistry , biology , ecology , biochemistry , genetics , thin film transistor , engineering
Morphology is a critical factor to determine the photovoltaic performance of organic solar cells (OSCs). However, delicately fine‐tuning the morphology involving only small molecules is an extremely challenging task. Herein, a simple, generic, and effective concentration‐induced morphology manipulation approach is demonstrated to prompt both the state‐of‐the‐art thin‐film BTR‐Cl:Y6 and thick‐film BTR:PC 71 BM all‐small‐molecule (ASM) OSCs to a record level. The morphology is delicately controlled by subtly altering the prepared solution concentration but maintaining the identical active layer thickness. The remarkable performance enhancement achieved by this approach mainly results from the enhanced absorption, reduced trap‐assistant recombination, increased crystallinity, and optimized phase‐separated network. These findings demonstrate that a concentration‐induced morphology manipulation strategy can further propel the reported best‐performing ASM OSCs to a brand‐new level, and provide a promising way to delicately control the morphology towards high‐performance ASM OSCs.