Journal
ADVANCED MATERIALS
Volume 31, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201807832
Keywords
crystallinity; miscibility; organic solar cell; side chain; small molecular acceptor
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Funding
- National Natural Science Foundation of China [21502205, 51573205, 51773220]
- Ministry of Science and Technology of China [2016YFE0115000]
- Qingdao Source Innovation Plan Applied Basic Research Project [18-2-2-28-jch]
- DICPQIBEBT [UN201805]
- Dalian National Laboratory for Clean Energy (DNL), CAS
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Research on fused-ring small-molecular-acceptors (SMAs) has deeply advanced the development of organic solar cells (OSCs). Compared to fruitful studies of ladder-type cores and end-caps of SMAs, the exploration of side chains is monotonous. The widely utilized alkyl and aryl side chains usually produce a conflicting association between SMAs' crystallinity and miscibility. Herein, a fresh idea about the modification of side chains is reported to explore the subtle balance between the crystallinity and miscibility. Specifically, a phenyl is introduced to the tail of the alkyl side chain whereby a new acceptor IDIC-C4Ph is reported. Moderately weakened crystallinity is observed, while maintaining preferred absorption profiles and face-on orientations. Concurrently, remarkably improved heterojunction morphologies and stacking orientations are detected. PBDB-T:IDIC-C4Ph devices exhibit greater efficiency of 11.50% than devices from alky and aryl modified acceptors. Notably, the as-cast OSCs of PBDB-TF:IDIC-C4Ph reveal outstanding FF over 76% with the best efficiency up to 13.23%. The annealed devices reveal further increased efficiency exceeding 14% with the state of the art FF of 78.32%. Overall, an effective but easily navigable approach is demonstrated to modulate the crystallinity of SMAs toward synergistically improved morphologies and molecular orientations of bulk heterojunction enabling highly efficient OSCs.
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