Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/90343
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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 (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, providedthe original work is properly cited.
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