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Delicate Morphology Control Triggers 14.7% Efficiency All-Small-Molecule Organic Solar Cells
Tang, Hua1,2,3; Chen, Haiyan1; Yan, Cenqi2; Huang, Jiaming2; Fong, Patrick W. K.2; Lv, Jie1,3; Hu, Dingqin1; Singh, Ranbir4; Kumar, Manish5; Xiao, Zeyun1
2020-06-05
摘要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:PC71BM 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.
关键词all-small-molecule high-performance morphology control organic solar cells
DOI10.1002/aenm.202001076
发表期刊ADVANCED ENERGY MATERIALS
ISSN1614-6832
页码9
通讯作者Yan, Cenqi(cenqi.cq.yan@polyu.edu.hk) ; Lu, Shirong(lushirong@cigit.ac.cn) ; Li, Gang(gang.w.li@polyu.edu.hk)
收录类别SCI
WOS记录号WOS:000537761300001
语种英语