Rational Tuning of Molecular Interaction and Energy Level Alignment Enables High-Performance Organic Photovoltaics

Rui Wang; Jun Yuan; Rui Wang; Guangchao Han; Tianyi Huang; Wenchao Huang; Jingjing Xue; Hao-Cheng Wang; Chunfeng Zhang; Chenhui Zhu; Pei Cheng; Dong Meng; Yuanping Yi; Kung-Hwa Wei; Yingping Zou; Yang Yang

doi:10.1002/adma.201904215

Rational Tuning of Molecular Interaction and Energy Level Alignment Enables High-Performance Organic Photovoltaics

Adv Mater. 2019 Oct;31(43):e1904215. doi: 10.1002/adma.201904215. Epub 2019 Sep 9.

Authors

Rui Wang¹, Jun Yuan^{1

2}, Rui Wang³, Guangchao Han⁴, Tianyi Huang¹, Wenchao Huang¹, Jingjing Xue¹, Hao-Cheng Wang⁵, Chunfeng Zhang³, Chenhui Zhu⁶, Pei Cheng¹, Dong Meng¹, Yuanping Yi⁴, Kung-Hwa Wei⁵, Yingping Zou², Yang Yang¹

Affiliations

¹ Department of Materials Science and Engineering and California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
² College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
³ National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
⁴ CAS Key Laboratory of Organic Solids, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
⁵ Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan.
⁶ Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.

PMID: 31495980
DOI: 10.1002/adma.201904215

Abstract

The performance of organic photovoltaics (OPVs) has rapidly improved over the past years. Recent work in material design has primarily focused on developing near-infrared nonfullerene acceptors with broadening absorption that pair with commercialized donor polymers; in the meanwhile, the influence of the morphology of the blend film and the energy level alignment on the efficiency of charge separation needs to be synthetically considered. Herein, the selection rule of the donor/acceptor blend is demonstrated by rationally considering the molecular interaction and energy level alignment, and highly efficient OPV devices using both-fluorinated or both-nonfluorinated donor/acceptor blends are realized. With the enlarged absorption, ideal morphology, and efficient charge transfer, the devices based on the PBDB-T-F/Y1-4F blend and PBDB-T-F/Y6 exhibit champion power conversion efficiencies as high as 14.8% and 15.9%, respectively.

Keywords: driving force; energy alignment; morphology; organic photovoltaics; organic solar cells.

Abstract

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