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Side-chain modification of non-fullerene acceptors for organic solar cells with efficiency over 18%
Li, Zhixiang1,2; Jiang, Changzun1,2; Chen, Xin1,2; Song, Guangkun1,2; Wan, Xiangjian1,2; Kan, Bin4; Duan, Tainan1,2,5; Knyazeva, Ekaterina A.3; Rakitin, Oleg A.3; Chen, Yongsheng1,2
2023-06-01
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.
DOI10.1039/d3tc00820g
发表期刊JOURNAL OF MATERIALS CHEMISTRY C
ISSN2050-7526
卷号11期号:21页码:6920-6927
通讯作者Kan, Bin(kanbin04@nankai.edu.cn) ; Chen, Yongsheng(yschen99@nankai.edu.cn)
收录类别SCI
WOS记录号WOS:000983918800001
语种英语