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Title: Reducing VOC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%-efficiency ternary organic photovoltaics
Authors: Yan, C 
Ma, R
Cai, G
Liu, T
Zhu, J
Wang, J
Li, Y
Huang, J 
Luo, Z
Xiao, Y
Lu, X
Yang, Y
Zhan, X
Yan, H
Li, G 
Issue Date: Dec-2020
Source: EcoMat, Dec. 2020, v. 2, no. 4, e12061, p. 1-11
Abstract: The ternary strategy is effectual to attain high-performance organic photovoltaics (OPVs). Herein, device processing and performance of PM6:Y6:IT-4F OPVs is improved, and ITIC-Th with high-lying lowest unoccupied molecular orbital is incorporated into PM6: Y6 blend. The PM6:Y6: ITIC-Th device afforded an excellent PCE of 17.2%, surpassing PM6: Y6 device, and becoming one of the highest PCE. The resulting ITIC-Th-based ternary OSCs demonstrated low energy loss (Eloss) of 0.53 to 0.54 eV, as compared to their binary counterparts with either high open-circuit voltage (VOC) but large Eloss, or less Eloss but low VOC. The incorporation of ITIC-Th and IT-4F balanced the charge mobilities, and thereby retained and improved fill factors. Increased crystalline coherence length and smaller d-spacing of π-π peaks are also observed in ternary blends, indicating enhanced crystallinity and thus improved active-layer morphology. These findings demonstrate the feasibility of exploring the exciting pool of nonfullerene acceptors to pursue new breakthroughs of OPVs.
Publisher: John Wiley & Sons
Journal: EcoMat
EISSN: 2567-3173
DOI: 10.1002/eom2.12061
Rights: © 2020 The Authors. EcoMat published by The Hong Kong Polytechnic University and John Wiley & Sons Australia, Ltd.
This is an open access article under the terms of the Creative Commons Attribution License (, which permits use, distribution and reproduction in any medium, providedthe original work is properly cited.
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