Bithieno[3,4-c]pyrrole-4,6-dione-Mediated Crystallinity in Large-Bandgap Polymer Donors Directs Charge Transportation and Recombination in Efficient Nonfullerene Polymer Solar Cells

Embargo End Date
2021-01-02

Type
Article

Authors
Zhao, Jiaji
Li, Qingduan
Liu, Shengjian
Cao, Zhixiong
Jiao, Xuechen
Cai, Yue-Peng
Huang, Fei

Online Publication Date
2020-01-02

Print Publication Date
2020-02-14

Date
2020-01-02

Submitted Date
2019-12-30

Abstract
Solution-processed nonfullerene bulk-heterojunction (BHJ) polymer solar cells (PSCs), which are composed of polymer donors and organic acceptors, are proven to manifest promising performance and long-term stability. In this concise contribution, bithieno[3,4-c]pyrrole-4,6-dione (BiTPD), which is a TPD derivative but presents a large planar structure and strong electron-withdrawing ability, was used to construct a large-bandgap polymer donor PBiTPD. Results show that the polymer donor PBiTPD realized power conversion efficiency (PCE) as high as 14.2% in fullerene-free BHJ solar cells. Larger ionization potential value, more favorable face-on backbone orientation, and stronger crystallinity were concurrently obtained in PBiTPD. Correspondingly, improved and more balanced charge transportation; less nongeminate and trap-assisted recombination losses; and thus high fill factor (FF) of 67%, short-circuit current density (JSC) of 25.6 mA·cm-2, and high open-circuit voltage (VOC) of 0.83 V were concurrently achieved in PBiTPD-based devices. PBiTPD does clear the way for a novel and promising class of large-bandgap polymer donor candidates.

Citation
Zhao, J., Li, Q., Liu, S., Cao, Z., Jiao, X., Cai, Y.-P., & Huang, F. (2020). Bithieno[3,4-c]pyrrole-4,6-dione-Mediated Crystallinity in Large-Bandgap Polymer Donors Directs Charge Transportation and Recombination in Efficient Nonfullerene Polymer Solar Cells. ACS Energy Letters, 5(2), 367–375. doi:10.1021/acsenergylett.9b02842

Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 21805097, 21671071, and 51521002), the Guangdong Natural Science Foundation (No. 2016A030310428), Guangdong Applied Science and Technology Planning Project (Nos. 2015B010135009 and 2017B090917002), and Guangzhou Science and Technology Foundation (No. 201904010361). The authors thank Jinwei Gao (SCNU), Xin Song (King Abdullah University of Science & Technology (KAUST)), Zhiguang Xu (SCNU), and Wei Wei (SCNU) for help in thin-film thickness, PESA, theoretical calculation, and PL measurements, respectively. The authors appreciate SCNU Analysis & Testing Center for technical support. This work was performed in part on the SAXS/WAXS beamline at the Australian Synchrotron, which is part of ANSTO.

Publisher
American Chemical Society (ACS)

Journal
ACS Energy Letters

DOI
10.1021/acsenergylett.9b02842

Additional Links
https://pubs.acs.org/doi/10.1021/acsenergylett.9b02842

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