A Nonfullerene Acceptor with Alkylthio‐ and Dimethoxy‐Thiophene‐Groups Yielding High‐Performance Ternary Organic Solar Cells

Journal Article · 03 October 2019 · Solar RRL

DOI: https://doi.org/10.1002/solr.201900353 · OSTI ID:1569291

Zeng, Anping ^[1]; Pan, Mingao ^[2]; Lin, Baojun ^[3]; Lau, Tsz-Ki ^[4]; Qin, Minchao ^[4]; Li, Kun ^[5]; Ma, Wei ^[3]; Lu, Xinhui ^[4]; Zhan, Chuanlang ^[6]; Yan, He  ^[7]

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1. College of Chemistry and Environmental Science Inner Mongolia Normal University Huhhot 010022 China, CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China, Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration &, Reconstruction Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
2. CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China, Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration &, Reconstruction Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
3. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
4. Department of Physics Chinese University of Hong Kong New Territories Hong Kong China
5. CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
6. College of Chemistry and Environmental Science Inner Mongolia Normal University Huhhot 010022 China, CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
7. Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration &, Reconstruction Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China

Herein, an A–D–A‐type nonfullerene acceptor (named IDTS‐4F) with an alkyl thiophenyl side chain and dimethoxy thiophene bridging unit is reported. The use of an alkyl thiophenyl group is important, as the insertion of sulfur atoms can slightly downshift the highest occupied molecular orbital (HOMO) level of the molecule and allows IDTS‐4F to match with state‐of‐the‐art donor polymer PM6 (or PM7). Compared with conventional nonfullerene acceptors, IT‐4F, the IDTS‐4F molecule, has a smaller optical bandgap and higher lowest unoccupied molecular orbital (LUMO) level, which are beneficial to increase the V _oc and J _sc of the devices. Nonfullerene organic solar cell devices are fabricated using IDTS‐4F. Although the binary device based on IDTS‐4F exhibits a lower fill factor (FF, 70%), the ternary device by incorporating 0.2 of IDTS‐4F and 0.8 of IT‐4F (with PM6 as the donor polymer) can simultaneously achieve a higher V _oc and J _sc , while maintaining the high FF (77%) of IT‐4F based system. Morphology characterizations indicate the formation of homogeneous film morphology, the large increase in phase purity and crystallinity, and the reduction in domain size upon addition of crystalline IDTS‐4F, while the electron/hole mobilities and recombination losses of the IT‐4F system are both maintained.

• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1569291
• Journal Information: Solar RRL, Journal Name: Solar RRL Journal Issue: 1 Vol. 4; ISSN 2367-198X
• Publisher: Wiley Blackwell (John Wiley & Sons)Copyright Statement
• Country of Publication: Germany
• Language: English