Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803541
Keywords
anthracene; end-group modulation; energy level match; nonfullerene acceptors
Categories
Funding
- NSFC [91633301, 51773095]
- Tianjin city [17JCJQJC44500, 17CZDJC31100]
- 111 Project [B12015]
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Two new nonfullerene small molecule acceptors (NF-SMAs) AT-NC and AT-4Cl based on heptacyclic anthracene(cyclopentadithiophene) (AT) core and different electron-withdrawing end groups are designed and synthesized. Although the two new acceptor molecules use two different end groups, naphthyl-fused indanone (NINCN) and chlorinated INCN (INCN-2Cl) demonstrate similar light absorption. AT-4Cl with chlorinated INCN as end groups are shifted significantly due to the strong electron-withdrawing ability of chlorine atoms. Thus, desirable V-oc, and photovoltaic performance are expected to be achieved when polymer PBDB-T is used as the electron donor with AT-NC as the acceptor, and fluorinated analog PBDB-TF with down-shifted energy levels is selected to blend with AT-4Cl. Consequently, the device based on P6DB-TF:AT-4Cl yields a high power conversion efficiency of 13.27% with a slightly lower V-oc of 0.901 V, significantly enhanced J(sc) of 19.52 mA cm(-2) and fill factor of 75.5% relative to the values based on PBDB-T:AT-NC. These results demonstrate that the use of a new electron-rich AT core, together with energy levels modulations by end-group optimizations enabling the match with polymer donors, is a successful strategy to construct high-performance NF-SMAs.
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