Readily Accessible Benzo[d]thiazole Polymers for Nonfullerene Solar Cells with >16% Efficiency and Potential Pitfalls

Liang Wen Feng, Jianhua Chen, Subhrangsu Mukherjee, Vinod K. Sangwan, Wei Huang, Yao Chen, Ding Zheng, Joseph W. Strzalka, Gang Wang, Mark C. Hersam, Mark C. Hersam, Mark C. Hersam, Dean Delongchamp, Antonio Facchetti, Antonio Facchetti, Tobin J. Marks, Tobin J. Marks

Research output: Contribution to journalArticle

Abstract

Here we report facile, high-yield synthetic access to the difluoro BTA building block, 4,7-bis(5-bromo-4-(2-hexyl-decyl)-thiophen-2-yl)-5,6-difluoro-2-(pentadecan-7-yl)-benzo[d]thiazole (BTAT-2f), for use in donor (D)-acceptor 1 (A1)-D-acceptor 2 (A2) polymers [D = bithiophene; A1 = BTA-2f; A2 = benzothiadiazole (BT) derivative] for organic solar cells (OSCs). Fine tuning of polymer optical and electronic properties is achieved by incrementally varying the A2 fluorination level. Bulk-heterojunction (BHJ) PBTATBT-4f:Y6 solar cells deliver a noteworthy power conversion (PCE) efficiency of 16.08% (Voc = 0.81 V; Jsc = 27.25 mAcm-2 FF = 72.70%) without processing additives. In contrast, PBTATBT-2f:Y6 exhibits an irregular morphology and low PCE, ascribable to cocrystal formation-induced recombination, which is unprecedented for nonfullerene (NFA) OSCs. This result should be of guiding significance for future NFA design.

Original languageEnglish
Pages (from-to)1780-1787
Number of pages8
JournalACS Energy Letters
Volume5
Issue number6
DOIs
Publication statusPublished - Jun 12 2020

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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  • Cite this

    Feng, L. W., Chen, J., Mukherjee, S., Sangwan, V. K., Huang, W., Chen, Y., Zheng, D., Strzalka, J. W., Wang, G., Hersam, M. C., Hersam, M. C., Hersam, M. C., Delongchamp, D., Facchetti, A., Facchetti, A., Marks, T. J., & Marks, T. J. (2020). Readily Accessible Benzo[d]thiazole Polymers for Nonfullerene Solar Cells with >16% Efficiency and Potential Pitfalls. ACS Energy Letters, 5(6), 1780-1787. https://doi.org/10.1021/acsenergylett.0c00691