DataVXACS Applied Materials & InterfacesPaper
journal article·2019-09-11Open access

Revealing the Position Effect of an Alkylthio Side Chain in Phenyl-Substituted Benzodithiophene-Based Donor Polymers on the Photovoltaic Performance of Non-Fullerene Organic Solar Cells

Weichao Chen, Gongyue Huang, Xiaoming Li, Yonghai Li, Huan Wang, Huanxiang Jiang, Zhihui Zhao, Donghong Yu, Ergang Wang, Renqiang Yang

ACS Applied Materials & Interfaces· Volume 11· Issue 36
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Source abstract

Abstract

In this work, position effects of an alkylthio side chain were investigated by designing and synthesizing two copolymers based on a phenyl-substituted benzo[1,2-b:4,5-b′]dithiophene (BDTP) and difluorobenzotriazole (FTAZ). The polymer based on the meta-position-alkylthiolated BDTP, named m-PBDTPS–FTAZ, showed a relatively broader bandgap (2.00 vs 1.96 eV) and lower highest occupied molecular orbital (HOMO) energy level (−5.40 vs −5.32 eV) than its para-positioned structural isomeric analogue polymer (named p-PBDTPS–FTAZ), that is, m- and p-PBDTPS–FTAZ with the side chain structured as ethylhexyl- in the phenyl unit and hexyldecyl- in the FTAZ moiety. When blended with ITIC, m-PBDTPS–FTAZ showed a comparable crystallinity but more uniform morphology compared to that of p-PBDTPS–FTAZ. A high power conversion efficiency of 13.16% was achieved for m-PBDTPS–FTAZ:ITIC devices with a high open circuit voltage (VOC) of 0.95 V, which is higher than that of p-PBDTPS–FTAZ:ITIC devices (10.86%) with a VOC of 0.89 V. Therefore, m-BDTPS could be an effective donor unit to construct high-efficiency polymers due to its effectively decreased HOMO energy level of polymers while still maintaining good molecular stacking.
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Research context

PolymersElectronic materials

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Semiconductor materials and interfaces

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Textiles & Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center for Eco-Textiles of Shandong Province, Qingdao University, Qingdao 266071, China

CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China

Department of Chemistry and Bioscience, Aalborg University, Aalborg DK-9220, Denmark

Sino-Danish Centre for Education and Research, Aarhus DK-8000, Denmark

Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg SE-412 96, Sweden

Funding

Svenska Forskningsr?det Formas · Vetenskapsr?det · Knut och Alice Wallenbergs Stiftelse · National Natural Science Foundation of China · Natural Science Foundation of Shandong Province · Sino-Danish Center for Education and Research · Dalian Institute of Chemical Physics, Chinese Academy of Sciences · Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences · Dalian National Laboratory for Clean Energy

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