中文版 | English
CSpace
Donor Derivative Incorporation: An Effective Strategy toward High Performance All-Small-Molecule Ternary Organic Solar Cells
Tang, Hua1,2,3; Xu, Tongle1,2; Yan, Cenqi3; Gao, Jie1; Yin, Hang3; Lv, Jie1,2; Singh, Ranbir4; Kumar, Manish5; Duan, Tainan1; Kan, Zhipeng1
2019-11-01
摘要Thick-film all-small-molecule (ASM) organic solar cells (OSCs) are preferred for large-scale fabrication with printing techniques due to the distinct advantages of monodispersion, easy purification, and negligible batch-to-batch variation. However, ASM OSCs are typically constrained by the morphology aspect to achieve high efficiency and maintain thick film simultaneously. Specifically, synchronously manipulating crystallinity, domain size, and phase segregation to a suitable level are extremely challenging. Herein, a derivative of benzodithiophene terthiophene rhodanine (BTR) (a successful small molecule donor for thick-film OSCs), namely, BTR-OH, is synthesized with similar chemical structure and absorption but less crystallinity relative to BTR, and is employed as a third component to construct BTR:BTR-OH:PC71BM ternary devices. The power conversion efficiency (PCE) of 10.14% and fill factor (FF) of 74.2% are successfully obtained in approximate to 300 nm OSC, which outperforms BTR:PC71BM (9.05% and 69.6%) and BTR-OH:PC71BM (8.00% and 65.3%) counterparts, and stands among the top values for thick-film ASM OSCs. The performance enhancement results from the enhanced absorption, suppressed bimolecular/trap-assisted recombination, improved charge extraction, optimized domain size, and suitable crystallinity. These findings demonstrate that the donor derivative featuring similar chemical structure but different crystallinity provides a promising third component guideline for high-performance ternary ASM OSCs.
关键词morphology organic solar cells small molecules structural similarity thick films
DOI10.1002/advs.201901613
发表期刊ADVANCED SCIENCE
卷号6期号:21页码:8
通讯作者Kan, Zhipeng(kanzhipeng@cigit.ac.cn) ; Lu, Shirong(lushirong@cigit.ac.cn) ; Li, Gang(gang.w.li@polyu.edu.hk)
收录类别SCI
WOS记录号WOS:000496253700024
语种英语