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Synergy of Liquid‐Crystalline Small‐Molecule and Polymeric Donors Delivers Uncommon Morphology Evolution and 16.6% Efficiency Organic Photovoltaics

Cenqi YanDepartment of Electronic and Information Engineering The Hong Kong Polytechnic University Hung Hum Kowloon Hong Kong 999077 ChinaHua TangDepartment of Electronic and Information Engineering The Hong Kong Polytechnic University Hung Hum Kowloon Hong Kong 999077 ChinaRuijie MaDepartment of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction Hong Kong University of Science and Technology (HKUST) Clear Water Bay Kowloon Hong Kong 999077 ChinaMing ZhangDepartment of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiaotong University Shanghai 200240 ChinaTao LiuDepartment of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction Hong Kong University of Science and Technology (HKUST) Clear Water Bay Kowloon Hong Kong 999077 ChinaJie LvOrganic Semiconductor Research Center Chongqing Institute of Green and Intelligent Technology Chongqing 400714 ChinaJiaming HuangDepartment of Electronic and Information Engineering The Hong Kong Polytechnic University Hung Hum Kowloon Hong Kong 999077 ChinaYankang YangDepartment of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiaotong University Shanghai 200240 ChinaTongle XuOrganic Semiconductor Research Center Chongqing Institute of Green and Intelligent Technology Chongqing 400714 ChinaZhipeng KanOrganic Semiconductor Research Center Chongqing Institute of Green and Intelligent Technology Chongqing 400714 ChinaHe YanDepartment of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction Hong Kong University of Science and Technology (HKUST) Clear Water Bay Kowloon Hong Kong 999077 ChinaFeng LiuDepartment of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiaotong University Shanghai 200240 ChinaShirong LuOrganic Semiconductor Research Center Chongqing Institute of Green and Intelligent Technology Chongqing 400714 ChinaGang LiDepartment of Electronic and Information Engineering The Hong Kong Polytechnic University Hung Hum Kowloon Hong Kong 999077 China

2020en

ABI

Annotatsiya

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.

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Identifikatorlar

DOI: 10.1002/advs.202000149

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