%0 Journal Article %A Kang, Zhenjing %A Chen, Shan-Ci %A Ma, Yunlong %A Wang, Jianbin %A Zheng, Qingdong %D 2017 %T Push–Pull Type Non-Fullerene Acceptors for Polymer Solar Cells: Effect of the Donor Core %U https://acs.figshare.com/articles/journal_contribution/Push_Pull_Type_Non-Fullerene_Acceptors_for_Polymer_Solar_Cells_Effect_of_the_Donor_Core/5198542 %R 10.1021/acsami.7b05417.s001 %2 https://acs.figshare.com/ndownloader/files/8869675 %K power conversion efficiency %K CDTDI %K Polymer Solar Cells %K non-fullerene small-molecule acceptors %K INCN %K core %K ITDI %K non-fullerene acceptors %K PCE %K PSC %X 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 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. %I ACS Publications