journal article·2020-06-22

Axisymmetric and Asymmetric Naphthalene-Bisthienothiophene Based Nonfullerene Acceptors: On Constitutional Isomerization and Photovoltaic Performance

Wei Hu, Xiaoyan Du, Wenliu Zhuang, Wenyan Su, Jiamin Cao, Amir Masoud Pourrahimi, Ning Li, Xingxing Shen, Maojie Zhang, Donghong Yu, Wolfgang Gruber, Tobias Unruh, Ergang Wang, Christoph J. Brabec

ACS Applied Energy Materials· Volume 3· Issue 6
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Abstract

Two pairs of constitutional isomers of fused-octacyclic nonfullerene acceptors (NFAs) based on a naphthalene-bisthienothiophene core with or without fluorination at the ending groups have been developed. Compared with the axisymmetric NFAs N66-IC and N66-2FIC with two six-member-ring bridges, their asymmetric constitutional isomers N65-IC and N65-2FIC both with one six-member-ring bridge and one five-member-ring bridge exhibit remarkable red-shifted absorption, higher crystallinity, and slightly down-shifted LUMO energy levels. Organic solar cells based on PBDB-T-2F:N65-2FIC achieved a promising power conversion efficiency of 10.19%, which is three times higher than that of its counterpart PBDB-T-2F:N66-2FIC cell (3.46%). While being blended with PBDB-T as the donor material, the asymmetric acceptor analogue N65-IC based solar cell pronounces a PCE of 9.03%, being significantly improved from that of 5.45% for the PBDB-T:N66-IC based cell, which is in consistency with the results from those cells from their both fluorinated donor and acceptor counterparts. Design rules on either both fluorinated, both nonfluorinated, or cross-combined donor/acceptors for device fabrication has been explored. In addition, PBDB-T-2F:N65-2FIC possesses very promising device stability with 85% of its initial PCE after an exposure time of 1500 h under one sun illumination, which is meaningful for their future commercial devices.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

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Affiliations

Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstrasse 7, 91058 Erlangen, Germany

Helmholtz-Institute Erlangen-Nürnberg (HI ERN), Immerwahrstrasse 2, 91058 Erlangen, Germany

Advanced Research Center for Polymer Processing Engineering of Guangdong Province, Guangdong Industry Polytechnic, Guangzhou 510300, China

Department of Chemistry and Chemical Engineering/Applied Chemistry, Chalmers University of Technology, Göteborg SE-41296, Sweden

Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

College of Chemical Engineering, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China

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

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

Institute of Crystallography and Structural Physics, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 3, 91058 Erlangen, Germany

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

Funding

Svenska Forskningsr?det Formas · Guangdong Science and Technology Department · Bundesministerium f?r Bildung und Forschung · Vetenskapsr?det · Natural Science Foundation of?Hunan Province · Deutsche Forschungsgemeinschaft · Department of Education of Guangdong Province · Innovationsfonden · China Scholarship Council · State Key Laboratory of Luminescent Materials and Devices · Solar Technologies go Hybrid · National Natural Science Foundation of China · Sino-Danish Centre for Education and Research · Collaborative Innovation Center of Suzhou Nano Science & Technology · Wallenberg Foundation · State of Bavaria · Guangzhou Municipal Science and Technology Bureau

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