Journal
ADVANCED MATERIALS
Volume 30, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201707170
Keywords
intramolecular electron push-pull effect; miscibility; nonfullerene acceptor; organic solar cell; vibrational relaxation
Categories
Funding
- NSFC [91633301, 51673201]
- Chinese Academy of Sciences [XDB12030200, KJZD-EW-J01]
- National Basic Research Program 973 [2014CB643501]
- Office of Naval Research (ONR) [N00141512322, N000141712204]
- U.S. Department of Energy [DE-AC02-05CH11231]
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Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well-studied properties, a stronger intramolecular electron push-pull effect also affords other advantages in nonfullerene acceptors. A strong push-pull effect improves the dipole moment of the wings in IT-4F over IT-M and results in a lower miscibility than IT-M when blended with PBDB-TF. This feature leads to higher domain purity in the PBDB-TF:IT-4F blend and makes a contribution to the better photovoltaic performance. Moreover, the strong push-pull effect also decreases the vibrational relaxation, which makes IT-4F more promising than IT-M in reducing the energetic loss of organic solar cells. Above all, a power conversion efficiency of 13.7% is recorded in PBDB-TF:IT-4F-based devices.
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