Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202200166
Keywords
intermolecular interactions; nonfullerene acceptors; organic photovoltaics; side chains; unilateral pi-bridges
Categories
Funding
- Youth Innovation Promotion Association CAS [2021211]
- National Natural Science Foundation of China [51773220, 51873227]
- Shandong Energy Institute [SEII202111, SEIS202108, DICPQIBEBT UN201805]
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Thanks to the development of A-D-A type electron acceptors, organic solar cells have made remarkable progress. In this study, new acceptors with the synergistic effect of side chain and unilateral pi-bridge strategy were designed, leading to improved efficiency and molecular interactions. The resulting binary solar cell achieved an impressive efficiency of 15.36%, ranking the best among all small molecular acceptors with symmetric or asymmetric pi-bridges. The results highlight the importance of manipulating molecular interactions in achieving efficient charge transport and exciton dissociation.
Thanks to the development of acceptor-donor-acceptor (A-D-A) type electron acceptors, organic solar cells (OSCs) have achieved marvelous progress in recent years. However, a systematic investigation about the structure-efficiency relationship is still highly desired to better understand the working mechanisms inside a bulk heterojunction (BHJ). In this study, new acceptors with the synergistic effect of side chain and unilateral pi-bridge strategy are designed, accounting for lower energy loss, expanded absorption, modulated intermolecular interactions and BHJ morphology. As a consequence, the resultant A-D-pi-A acceptor ID-C6Ph-ST-4F based binary solar cell receives an impressive efficiency up to 15.36%, much greater than the A-D-A analog ID-C6Ph-4F (10.75%), and ranks the best among all small molecular acceptors with symmetric or asymmetric pi-bridges. The results highlight the promising manipulation of phenylalkyl side chain and unilateral pi-bridge on intermolecular interactions among acceptor molecules and interactions between donor and acceptor (D/A) molecules. Superior interactions among acceptor molecules are an essential precondition to ensure preferable molecular assembly for charge transport, and meanwhile, moderately enhanced D/A interactions are also crucial for proper phase-separation networks with efficient exciton dissociation and charge generation.
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