A nonfullerene acceptor incorporating a dithienopyran fused backbone for organic solar cells with efficiency over 14%

Ke, X (Ke, Xin); Meng, LX (Meng, Lingxian); Wan, XJ (Wan, Xiangjian); Cai, Y (Cai, Yao); Gao, HH (Gao, Huan-Huan); Yi, YQQ (Yi, Yuan-Qiu-Qiang); Guo, ZQ (Guo, Ziqi); Zhang, HT (Zhang, Hongtao); Li, CX (Li, Chenxi); Chen, YS (Chen, Yongsheng)^{[ 1 ]}

NANO ENERGY, 2020, 75, 文献号: 104988

DOI: 10.1016/j.nanoen.2020.104988

摘要

An acceptor-donor-acceptor (A-D-A) type small molecule acceptor ITOT-4Cl incorporating a dithienopyran (DTP) fused backbone, has been designed and synthesized. With the strong electron-donating capability of the backbone D unit, ITOT-4Cl shows a narrow band gap of 1.28 eV, and has an efficient absorption in near-infrared region up to 968 nm. The photovoltaic devices based on PBDB-T:ITOT-4Cl give a power conversion efficiency (PCE) of 12.50%, with a high short circuit current density (J(sc)) of 22.89 mA cm(-2). With F-Br as the third component, the ternary organic solar cells device shows an enhanced PCE of 14.29% with an improved J(sc) of 24.40 mA cm(-2), which is among the best results for oxygen heterocycle fused nonfullerene acceptor based devices.