Side-chain modification of non-fullerene acceptors for organic solar cells with efficiency over 18%
作者:
Li, ZX (Li, Zhixiang) [1] , [2] ; Jiang, CZ (Jiang, Changzun) [1] , [2] ; Chen, X (Chen, Xin) [1] , [2] ; Song, GK (Song, Guangkun) [1] , [2] ; Wan, XJ (Wan, Xiangjian) [1] , [2] ; Kan, B (Kan, Bin) [4] ; Duan, TA (Duan, Tainan) [1] , [2] , [5] ; Knyazeva, EA (Knyazeva, Ekaterina A.) [3] ; Rakitin, OA (Rakitin, Oleg A.) [3] ; Chen, YS (Chen, Yongsheng) [1] , [2]
DOI
10.1039/d3tc00820g
在线发表
APR 2023
已索引
2023-05-26
文献类型
Article; Early Access
摘要
Three non-fullerene acceptors BTP-OC4, BTP-OC6 and BTP-OC8 with different 4-alkyloxyphenyl side-chains were designed and synthesized through a new synthetic route without organotin reagent. The length of the alkyloxy attached to the benzene ring has no influence on the energy levels and absorption of these small-molecular acceptors. However, the active layer morphology is modulated by the different crystallinity caused by the different chain's length. Among them, the device based on the PM6:BTP-OC6 system exhibited the lowest energy loss of 0.513 eV and the highest power conversion efficiency (PCE) of 17.59%, as well as excellent photo-soaking/thermal/storage stability. Moreover, when Y6 was introduced into PM6:BTP-OC6 to fabricate a ternary device, the PCE was promoted to over 18%. Our results provide a feasible strategy to develop high-performance acceptors through fine tuning the aromatic side chain, which can be easily realized by our reported synthetic route.