A generic approach yields organic solar cells with enhanced efficiency and thermal stability
Mengyuan Gao,
Kai Zhang,
Chunyong He,
Hanqiu Jiang,
Xiong Li,
Qingchun Qi,
Kangkang Zhou,
Yu Chen,
Wenchao Zhao,
Long Ye
Affiliations
Mengyuan Gao
School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
Kai Zhang
School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
Chunyong He
Spallation Neutron Source Science Center Dongguan China
Hanqiu Jiang
Spallation Neutron Source Science Center Dongguan China
Xiong Li
Mettler Toledo Shanghai China
Qingchun Qi
School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
Kangkang Zhou
School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
Yu Chen
Institute of High Energy Physics Chinese Academy of Sciences (CAS) Beijing China
Wenchao Zhao
Co‐Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing China
Long Ye
School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
Abstract The use of deuterium are critical for promoting the fundamental understanding of aggregate materials and their new functions. Particularly, the solution structure of conjugated polymers can be hardly resolved without deuteration. However, studies about the isotopic effects of casting solvents on the aggregated structures of photovoltaic polymers and their bulk‐heterojunction blends are deficient. Here, the impact of deuterated solvents on the thermal behavior, aggregated structures, and device performance of photovoltaic polymers is clearly delineated for the first time by multiple techniques. The enhanced π‐π stacking order of photovoltaic polymers is highly relevant to their relatively poor miscibility with deuterated solvents. Benefiting from higher crystallinity and optimized morphology of deuterated solvents processed films, the devices are able to achieve better efficiency and notable improvement in thermal stability. Our results highlight the isotopic effects of solvents on the aggregated structure of conjugated polymer systems and reveal the potential of innovative approaches to fabricate thermally stable high‐efficiency solar cells.
