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low-bandgap polymers with quinoid unit as π bridge for high-performance solar cells

Journal of Energy Chemistry 2020年第1期29卷 180-187,I0007页

作者： Bilal Shahid Xiyue Yuan Qian Wang Di Zhou Ergang Wang Xichang Bao Dangqiang Zhu Renqiang Yang Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101ShandongChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Chemistry and Chemical Engineering/Applied Chemistry Chalmers University of TechnologyGothenburg SE-41296Sweden

To construct efficient low band gap polymers,increasing the Quinone structure of the polymer backbone could be one desirable *** this work,two D–Q–A–Q polymers P1 and P2 were designed and synthesized with thiophenopyrrole diketone(TPD)and benzothiadiazole(BT)unit as the core and ester linked thieno[3,4-b]thiophene(TT)segment as π-bridging,and the main focus is to make a comparative analysis of different cores in the influence of the optical,electrochemical,photochemical and morphological *** with the reported PBDTTEH–TBTTHD-i,P1 exhibited the decreased HOMO energy level of-5.38 e V and lower bandgap of 1.48 e ***,when replaced with BT core,P2 showed a red-shifted absorption profile of polymer but with up-shifted HOMO energy *** fabricated the photovoltaic devices in conventional structure,just as expected,the introduction of ester substituent made an obvious increase of VOC from 0.63 to 0.74 V for ***,due to the deep HOMO energy level,higher hole mobility and excellent phase separation with PC71 BM,a superior photovoltaic performance(PCE=7.13%)was obtained with a short-circuit current density(JSC)of 14.9 m A/cm^2,significantly higher than that of P2(PCE=2.23%).Generally,this study highlights that the strategy of inserting quinoid moieties into D–A polymers could be optional in LBG-polymers design and presents the importance and comparison of potentially competent core groups.

关键词： low bandgap polymer Side-chain engineering Quinone structure π-bridging

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