High-performance organic solar cells based on polymer donor/small molecule donor/nonfullerene acceptor ternary blends. Issue 5 (14th January 2019)

• Record Type: Journal Article
• Authors: Dai, Shuixing; Chandrabose, Sreelakshmi; Xin, Jingming; Li, Tengfei; Chen, Kai; Xue, Peiyao; Liu, Kuan; Zhou, Ke; Ma, Wei; Hodgkiss, Justin M.; Zhan, Xiaowei
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 5(2019)
• Page Start: 2268
• Page End: 2274
• Publication Date: 2019-01-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta11637g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Polymer donor/small molecule donor/nonfullerene acceptor ternary organic solar cells afford efficiency of 13.1%, higher than that of the polymer donor/nonfullerene acceptor binary blend (12.1%). Abstract : We used mid-bandgap small molecule donor TR as a third component to fabricate ternary nonfullerene organic solar cells (OSCs) based on narrow-bandgap polymer donor PTB7-Th and narrow-bandgap nonfullerene acceptor FOIC. TR exhibits full miscibility with PTB7-Th and efficient energy transfer to PTB7-Th, enhances stacking of PTB7-Th, hole mobility and charge generation of the blends, and ultimately improves device performance. Compared with the binary PTB7-Th/FOIC blend, the ternary device with 25% TR (w/w) yields simultaneously improved open-circuit voltage, short-circuit current density and fill factor. Finally, single-junction OSCs based on the ternary PTB7-Th/TR/FOIC blend yield power conversion efficiency as high as 13.1%, higher than the binary OSCs (12.1%). The ternary device efficiency exhibits high tolerance to thickness variation (>12% in the range of 80–200 nm). Transient absorption spectroscopy confirms the importance of long-range resonant energy transfer from donor to acceptor phases.