Adding a Third Component with Reduced Miscibility and Higher LUMO Level Enables Efficient Ternary Organic Solar Cells
Journal article, 2020
It is widely known that the miscibility between donor and acceptor is a crucial factor that affects the morphology and thus device performance of nonfullerene organic solar cells (OSCs). In this Letter, we show that incorporating a third component with lower miscibility and higher lowest unoccupied molecular orbital (LUMO) level into the state-of-the-art PM6:Y6 system can significantly enhance the performance of devices. The best results of the ternary devices are achieved by adding a small molecular acceptor named ITCPTC (similar to 5% w/w), which significantly improves the power conversion efficiency (PCE) of the host system from 16.44% to 17.42%. The higher LUMO of the third component increases the open-circuit voltage (V-oc), while the low miscibility enlarges the domains and leads to improved short-circuit current density (J(sc)) and fill factor (FF). The efficacy of this strategy is supported by using other nonfullerene third components including an asymmetric small molecule (N7IT) and a polymer acceptor (PF2-DTC), which play the same role as ITCPTC and boost the PCEs to 16.96% and 17.04%, respectively. Our approach can be potentially applied to a wide range of OSC material systems and should facilitate the development of the OSC field.
Author
Ruijie Ma
Hong Kong University of Science and Technology
Tao Liu
Hong Kong University of Science and Technology
Zhenghui Luo
Wuhan University
Hong Kong University of Science and Technology
Ke Gao
City University of Hong Kong
University of Washington
Kai Chen
Xi'an Jiaotong University
Guangye Zhang
eFlexPV Ltd
Wei Gao
City University of Hong Kong
Wuhan University
Yiqun Xiao
Chinese University of Hong Kong
Tsz-Ki Lau
Chinese University of Hong Kong
Qunping Fan
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Yuzhong Chen
Hong Kong University of Science and Technology
Lik-Kuen Ma
Hong Kong University of Science and Technology
Huiliang Sun
Hong Kong University of Science and Technology
Guilong Cai
Chinese University of Hong Kong
Tao Yang
University of Aveiro
Xinhui Lu
Chinese University of Hong Kong
Ergang Wang
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Chuluo Yang
Wuhan University
Alex K-Y Jen
City University of Hong Kong
University of Washington
He Yan
Hong Kong University of Science and Technology
ACS Energy Letters
23808195 (eISSN)
Vol. 5 8 2711-2720Subject Categories
Software Engineering
Embedded Systems
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1021/acsenergylett.0c01364