Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 29, Pages 24771-24777Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05417
Keywords
polymer solar cell; non-fullerene acceptor; push-pull; indenothiophene; power conversion efficiency
Funding
- National Natural Science Foundation of China [U1605241, 61325026, 51561165011]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH032]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
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There has been a growing interest in the design and synthesis of non-fullerene acceptors for organic solar cells that may overcome the drawbacks of the traditional fullerene-based acceptors. Herein, two novel pushpull (acceptordonoracceptor) type small-molecule acceptors, that is, ITDI and CDTDI, with indenothiophene and cyclopentadithiophene as the core units and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (INCN) as the end-capping units, are designed and synthesized for non-fullerene polymer solar cells (PSCs). After device optimization, PSCs based on ITDI exhibit good device performance with a power conversion efficiency (PCE) as high as 8.00%, outperforming the CDTDI-based counterparts fabricated under identical condition (2.75% PCE). We further discuss the performance of these non-fullerene PSCs by correlating the energy level and carrier mobility with the core of non-fullerene acceptors. These results demonstrate that indenothiophene is a promising electron-donating core for high-performance non-fullerene small-molecule acceptors.
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