An Alkylated Indacenodithieno[3,2-b ]thiophene-Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses
Eisner, Flurin D.
Röhr, Jason A.
Chesman, Anthony S. R.
Easton, Christopher D.
McNeill, Christopher R.
Anthopoulos, Thomas D.
KAUST DepartmentKAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2018-01-09
Print Publication Date2018-02
Permanent link to this recordhttp://hdl.handle.net/10754/626846
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AbstractA new synthetic route, to prepare an alkylated indacenodithieno[3,2-b]thiophene-based nonfullerene acceptor (C8-ITIC), is reported. Compared to the reported ITIC with phenylalkyl side chains, the new acceptor C8-ITIC exhibits a reduction in the optical band gap, higher absorptivity, and an increased propensity to crystallize. Accordingly, blends with the donor polymer PBDB-T exhibit a power conversion efficiency (PCE) up to 12.4%. Further improvements in efficiency are found upon backbone fluorination of the donor polymer to afford the novel material PFBDB-T. The resulting blend with C8-ITIC shows an impressive PCE up to 13.2% as a result of the higher open-circuit voltage. Electroluminescence studies demonstrate that backbone fluorination reduces the energy loss of the blends, with PFBDB-T/C8-ITIC-based cells exhibiting a small energy loss of 0.6 eV combined with a high JSC of 19.6 mA cm-2 .
CitationFei Z, Eisner FD, Jiao X, Azzouzi M, Röhr JA, et al. (2018) An Alkylated Indacenodithieno[3,2-b ]thiophene-Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses. Advanced Materials: 1705209. Available: http://dx.doi.org/10.1002/adma.201705209.
SponsorsThe authors thank the British Council (337323) EPSRC (EP/L016702/1, EP/M025020/1, EP/P02484X/1), the Daphne Jackson Trust and the Australian Research Council (DP170102145) for the financial support. This work was performed in part on the SAXS/WAXS beamline at the Australian Synchrotron, part of ANSTO.
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