Journal
ADVANCED MATERIALS
Volume 30, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201802888
Keywords
backbone ordering; fused-ring electron acceptors; molecular packing; morphology; organic photovoltaics
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Funding
- NSFC/RGC Joint Research Scheme [N_CUHK418/17]
- RGC of Hong Kong [14303314, T23-407/13-N]
- NSFC [51761165023, 21734001]
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Fused-ring electron acceptors (FREAs), as a family of non-fullerene (NF) acceptors, have achieved tremendous success in pushing the power conversion efficiency of organic solar cells. Here, the detailed molecular packing motifs of two extensively studied FREAsITIC and ITIC-Th are reported. It is revealed for the first time the long-range structure ordering along the backbone direction originated from favored end group - stacking. The backbone ordering could be significantly enhanced in the ternary film by the mutual mixing of ITIC and ITIC-Th, which gives rise to an improved in-plane electron mobility and better ternary device performance. The backbone ordering might be a common morphological feature of FREAs, providing explanations to previously observed small open circuit voltage loss and superior performance of FREA-based devices and guiding the future molecular design of high-performance NF acceptors.
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