Impact of Nonfullerene Acceptor Core Structure on the Photophysics and Efficiency of Polymer Solar Cells
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ArticleAuthors
Alamoudi, Maha A
Khan, Jafar Iqbal
Firdaus, Yuliar

Wang, Kai
Andrienko, Denis

Beaujuge, Pierre

Laquai, Frédéric

KAUST Department
KAUST Solar Center (KSC)Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2018-03-02Online Publication Date
2018-03-02Print Publication Date
2018-04-13Permanent link to this record
http://hdl.handle.net/10754/627308
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Small-molecule “nonfullerene” acceptors are promising alternatives to fullerene (PC61/71BM) derivatives often used in bulk heterojunction (BHJ) organic solar cells; yet, the efficiency-limiting processes and their dependence on the acceptor structure are not clearly understood. Here, we investigate the impact of the acceptor core structure (cyclopenta-[2,1-b:3,4-b′]dithiophene (CDT) versus indacenodithiophene (IDTT)) of malononitrile (BM)-terminated acceptors, namely CDTBM and IDTTBM, on the photophysical characteristics of BHJ solar cells. Using PCE10 as donor polymer, the IDTT-based acceptor achieves power conversion efficiencies (8.4%) that are higher than those of the CDT-based acceptor (5.6%) because of a concurrent increase in short-circuit current and open-circuit voltage. Using (ultra)fast transient spectroscopy we demonstrate that reduced geminate recombination in PCE10:IDTTBM blends is the reason for the difference in short-circuit currents. External quantum efficiency measurements indicate that the higher energy of interfacial charge-transfer states observed for the IDTT-based acceptor blends is the origin of the higher open-circuit voltage.Citation
Alamoudi MA, Khan JI, Firdaus Y, Wang K, Andrienko D, et al. (2018) Impact of Nonfullerene Acceptor Core Structure on the Photophysics and Efficiency of Polymer Solar Cells. ACS Energy Letters: 802–811. Available: http://dx.doi.org/10.1021/acsenergylett.8b00045.Sponsors
The research reported in this publication was supported by the Office of Sponsored Research (OSR) under the Grant Agreement FCS/1/3321/01 and by the King Abdullah University of Science and Technology (KAUST). M.A.A. is grateful to Saudi Basic Industries Corporation (SABIC) for funding received towards the Ph.D.Publisher
American Chemical Society (ACS)Journal
ACS Energy LettersAdditional Links
https://pubs.acs.org/doi/10.1021/acsenergylett.8b00045ae974a485f413a2113503eed53cd6c53
10.1021/acsenergylett.8b00045