Journal
ADVANCED MATERIALS
Volume 30, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705209
Keywords
conjugated polymers; crystal engineering; nonfullerene acceptors; organic solar cells
Categories
Funding
- British Council [337323]
- EPSRC [EP/L016702/1, EP/M025020/1, EP/P02484X/1]
- Daphne Jackson Trust
- Australian Research Council [DP170102145]
- Engineering and Physical Sciences Research Council [EP/K030671/1, EP/P02484X/1, EP/M025020/1, 1738165, 1376017] Funding Source: researchfish
- The British Council [337323] Funding Source: researchfish
- EPSRC [EP/K030671/1, EP/M025020/1, EP/P02484X/1] Funding Source: UKRI
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A 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 J(SC) of 19.6 mA cm(-2).
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