am7b05417_si_001.pdf (883.23 kB)
Push–Pull Type Non-Fullerene Acceptors for Polymer Solar Cells: Effect of the Donor Core
journal contribution
posted on 2017-07-05, 00:00 authored by Zhenjing Kang, Shan-Ci Chen, Yunlong Ma, Jianbin Wang, Qingdong ZhengThere
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 push–pull
(acceptor–donor–acceptor) 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.