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Synergy of Liquid-Crystalline Small-Molecule and Polymeric Donors Delivers Uncommon Morphology Evolution and 16.6% Efficiency Organic Photovoltaics
Yan, Cenqi1,2; Tang, Hua1,2,3; Ma, Ruijie4,5; Zhang, Ming6,7; Liu, Tao4,5; Lv, Jie3; Huang, Jiaming1,2; Yang, YanKang6,7; Xu, Tongle3; Kan, Zhipeng3
2020-06-18
摘要Achieving an ideal morphology is an imperative avenue for enhancing key parameters toward high-performing organic solar cells (OSCs). Among a myriad of morphological-control methods, the strategy of incorporating a third component with structural similarity and crystallinity difference to construct ternary OSCs has emerged as an effective approach to regulate morphology. A nematic liquid-crystalline benzodithiophene terthiophene rhodamine (BTR) molecule, which possesses the same alkylthio-thienyl-substituted benzo moiety but obviously stronger crystallinity compared to classical medium-bandgap polymeric donor PM6, is employed as a third component to construct ternary OSCs based on a PM6:BTR:Y6 system. The doping of BTR (5 wt%) is found to be enough to improve the OSC morphology-significantly enhancing the crystallinity of the photoactive layer while slightly reducing the donor/acceptor phase separation scale simultaneously. Rarely is such a morphology evolution reported. It positively affects the electronic properties of the device-prolongs the carrier lifetime, shortens the photocurrent decay time, facilitates exciton dissociation, charge transport, and collection, and ultimately boosts the power conversion efficiency from 15.7% to 16.6%. This result demonstrates that the successful synergy of liquid-crystalline small-molecule and polymeric donors delicately adjusts the active-layer morphology and refines device performance, which brings vibrancy to the OSC research field.
关键词liquid-crystalline molecules morphology organic solar cells ternary structures
DOI10.1002/advs.202000149
发表期刊ADVANCED SCIENCE
页码8
通讯作者Liu, Tao(liutaozhx@ust.hk) ; Liu, Feng(fengliu82@sjtu.edu.cn) ; Li, Gang(gang.w.li@polyu.edu.hk)
收录类别SCI
WOS记录号WOS:000540812700001
语种英语