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http://hdl.handle.net/10397/90343
| 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. |
| Appears in Collections: | Journal/Magazine Article |
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| eom2.12061.pdf | 3.48 MB | Adobe PDF | View/Open |
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