New small-molecule acceptors based on hexacyclic naphthalene(cyclopentadithiophene) for efficient non-fullerene organic solar cells

Yi, YQQ (Yi, Yuan-Qiu-Qiang); Feng, HR (Feng, Huanran); Chang, MJ (Chang, Meijia); Zhang, HT (Zhang, Hongtao)^[ 1 ] ; Wan, XJ (Wan, Xiangjian); Li, CX (Li, Chenxi); Chen, YS (Chen, Yongsheng)^[ 1 ]

JOURNAL OF MATERIALS CHEMISTRY A, 2017, 5(33): 17204-17210

DOI: 10.1039/c7ta05809h

 WOS:000408267300006

Abstract

A series of new non-fullerene small molecule acceptors (NTIC, NTIC-Me, NTIC-OMe and NTIC-F) based on the acceptor-donor-acceptor (A-D-A) architecture, using hexacyclic naphthalene(cyclopentadithiophene) as the central unit, were designed and synthesized. The non-fullerene OSC device based on PBDB-T:NTIC showed a highest PCE of 8.63%. With a relatively high-lying LUMO level of NTIC-OMe, the PBDB-T:NTIC-OMe based device obtained a comparatively high V-oc of 0.965 V and a PCE of 8.61% simultaneously. The results demonstrate that the naphthalene core is a promising building block for constructing highly efficient non-fullerene acceptors and further boosting the photovoltaic performance of the devices.