A General Elastomeric Agent to Addressing Embrittlement in High‐Efficiency Organic Solar Cells
Abstract
Abstract Organic solar cells (OSCs) that combine high photovoltaic efficiency with mechanical resilience are critical for wearable devices. However, prevalent acceptors often act as stress concentrators, leading to film embrittlement. A general toughening approach remains elusive. Here, a broadly applicable strategy is introduced using SEEPS, an elastomeric agent with finely‐tailored miscibility with the acceptor to toughen OSCs. A toughening parameter η , derived from dynamic mechanical analysis is defined, that quantitatively correlates with elastomer‐acceptor miscibility with mechanical enhancement. SEEPS induces pronounced secondary relaxations that dissipate strain energy, yielding an over 11‐fold increase in fracture strain. In situ grazing‐incidence X‐ray scattering reveals that SEEPS preserves molecular packing and suppresses phase separation under strain. The resulting intrinsically stretchable OSCs retain four‐fifths of starting efficiency after 500 stretch‐release cycles at 40% strain, and sustain its four‐fifths efficiency at 52% strain. This work achieves record‐breaking efficiency over 16% while preserving exceptional mechanical stretchability, offering insights for high‐performance stretchable photovoltaics.
Article Details
Authors (16)
Saimeng Li
School of Materials Science and Engineering State Key Laboratory of Advanced Materials For Intelligent Sensing Tianjin Key Laboratory of Molecular Optoelectronic Sciences Key Laboratory of Organic Integrated Circuits Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Tianjin China
Yufei Wang
Chemistry Division
Chunlong Sun
Jintao Feng
Jingyu Zuo
School of Materials Science and Engineering State Key Laboratory of Advanced Materials for Intelligent Sensing Tianjin Key Laboratory of Molecular Optoelectronic Sciences Key Laboratory of Organic Integrated Circuits Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering Tianjin University Tianjin 300072 China
Bing Sun
Dexia Han
School of Materials Science and Engineering State Key Laboratory of Advanced Materials for Intelligent Sensing Tianjin Key Laboratory of Molecular Optoelectronic Sciences Key Laboratory of Organic Integrated Circuits Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering Tianjin University Tianjin 300072 China
Mengyuan Gao
Xin Li
Biao Xiao
Wenchao Zhao
Vakhobjon Kuvondikov
Institute of Ion‐Plasma and Laser Technologies Uzbekistan Academy of Sciences Tashkent Uzbekistan
Sherzod Nematov
Karshi State Technical University Karshi Uzbekistan
Tao Jia
School of Chemistry and Chemical Engineering
Guangye Zhang
Long Ye
School of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Key Laboratory of Organic Integrated Circuits, Ministry of Education, Collaborative innovation Center of Chemical Science and Engineering (Tianjin)