Abstract

Abstract Material design of guest acceptor is always a big challenge for improving the efficiency of ternary organic solar cells (OSCs). Here, a pair of isomeric nonfullerene acceptors based on quinoxaline core, Qx– p ‐C ₇ H ₈ O and Qx– m ‐C ₇ H ₈ O, is designed and synthesized. By moving the alkoxy chain attached on side phenyl from meta ‐position to para ‐position, both π–π stacking distance and crystallinity are enhanced simultaneously. They obtain the uplifted lowest unoccupied molecular orbital level. Compared to Qx– m ‐C ₇ H ₈ O, Qx– p ‐C ₇ H ₈ O exhibits wider absorption spectrum and higher extinction coefficient. Using D18‐Cl:N3 as host materials, the addition of guest acceptor Qx– p ‐C ₇ H ₈ O significantly improves the power conversion efficiency (PCE) from 17.61% to 18.49% because of higher open‐circuit voltage (0.875 V) and short‐circuit current density (27.85 mA cm ⁻² ). This can be attributed to the faster exciton dissociation, more balanced carrier mobility, fine fiber morphology, and lower energy loss in the ternary devices. However, Qx– m ‐C ₇ H ₈ O‐based ternary device achieves relatively low PCE of 17.17% because this device shows extremely low electron mobility. The resultsmore » indicate that molecular stacking, film morphology, etc., can be effectively modulated by fine‐tuning the side chains of guest materials, which may be an effective design rule for further improving the PCE of OSCs.« less

Authors:

Guo, Yuntong ^[1]; Chen, Zhenyu ^[2]; Ge, Jinfeng ^[2]; Zhu, Jintao ^[3]; Zhang, Jinna ^[2]; Meng, Yuanyuan ^[2]; Ye, Qinrui ^[2]; Wang, Shijie ^[4]; Chen, Fei ^[3]; Ma, Wei ^[4]; Ge, Ziyi  ^[5]

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+ Show Author Affiliations

1. Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China, School of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 China
2. Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China
3. Department of Chemical and Environmental Engineering University of Nottingham Ningbo China Ningbo 315100 China
4. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xian 710049 China
5. Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China, Zhejiang Engineering Research Center for Energy Optoelectronic Materials and Devices Ningbo 315201 China

Publication Date:

Fri Aug 04 00:00:00 EDT 2023

Sponsoring Org.:

USDOE

OSTI Identifier:

1993868

Grant/Contract Number:  

DE‐AC02‐05CH11231

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Advanced Functional Materials

Additional Journal Information:

Journal Name: Advanced Functional Materials Journal Volume: 33 Journal Issue: 47; Journal ID: ISSN 1616-301X

Publisher:

Wiley Blackwell (John Wiley & Sons)

Country of Publication:

Germany

Language:

English