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Intermolecular Interaction Control Enables Co‐optimization of Efficiency, Deformability, Mechanical and Thermal Stability of Stretchable Organic Solar Cells
Author(s) -
Zhu Qinglian,
Xue Jingwei,
Zhang Lu,
Wen Jialun,
Lin Baojun,
Naveed Hafiz Bilal,
Bi Zhaozhao,
Xin Jingming,
Zhao Heng,
Zhao Chao,
Zhou Ke,
Frank Liu Shengzhong,
Ma Wei
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202007011
Subject(s) - materials science , organic solar cell , microscale chemistry , thermal stability , intermolecular force , photocurrent , polymer , ternary operation , nanotechnology , chemical engineering , chemical physics , composite material , optoelectronics , molecule , computer science , chemistry , organic chemistry , mathematics education , mathematics , engineering , programming language
Abstract Promoting efficiency, deformability, and life expectancy of stretchable organic solar cells (OSCs) have always been key concerns that researchers are committed to solving. However, how to improve them simultaneously remains challenging, as morphology parameters, such as ordered molecular arrangement, beneficial for highly efficient devices actually limits mechanical stability and deformability. In this study, the unfavorable trade‐off among these properties has been reconciled in an all‐polymer model system utilizing a mechanically deformable guest component. The success of this strategy stems from introducing a highly ductile component without compromising the pristine optimized morphology. Preferable interaction between two donors can maintain the fiber‐like structure while enhancing the photocurrent to improve efficiency. Morphology evolution detected via grazing incidence X‐ray scattering and in situ UV–vis absorption spectra during stretching have verified the critical role of strengthened interaction on stabilizing morphology against external forces. The strengthened interaction also benefits thermal stability, enabling the ternary films with small efficiency degradation after heating 1500 h under 80 °C. This work highlights the effect of morphology evolution on mechanical stability and provides new insights from the view of intermolecular interaction to fabricate highly efficient, stable, and stretchable/wearable OSCs.