@article{5729bb3cb1f84f7184cfa9950ca72020,
title = "Reducing VOC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17\%-efficiency ternary organic photovoltaics",
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 excel-lent 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 find-ings demonstrate the feasibility of exploring the exciting pool of nonfullerene acceptors to pursue new breakthroughs of OPVs.",
keywords = "energy loss, morphology, nonfullerene acceptor, organic photovoltaics, ternary",
author = "Cenqi Yan and Ruijie Ma and Guilong Cai and Tao Liu and Jingshuai Zhu and Jiayu Wang and Yuhao Li and Jiaming Huang and Zhenghui Luo and Yiqun Xiao and Xinhui Lu and Tao Yang and Xiaowei Zhan and He Yan and Gang Li",
note = "Funding Information: the Hong Kong Polytechnic University, Grant/Award Numbers: 1-ZE29, Work Programme: YW3Y; the National Key Research and Development Program of China, Grant/Award Number: 2019YFA0705900; Hong Kong Innovation and Technology Commission, Grant/ Award Numbers: ITC-CNERC14SC01, ITS/471/18; Hong Kong PhD Fellowship Funding Information: Cenqi Yan and Ruijie Ma contributed equally to this work. Gang Li thanks the support from the Research Grants Council of Hong Kong (15218517, C5037-18G), Shenzhen Science and Technology Innovation Commission (JCYJ20170413154602102), the funding for Project of Strategic Importance (1-ZE29), Sir Sze-yuen Chung Endowed Professorship fund provided by the Hong Kong Polytechnic University, and National Natural Science Foundation of China (51961165102). Gang Li and Cenqi Yan thank the Hong Kong Polytechnic University for Postdoctoral Fellowships Scheme (YW3Y). He Yan thanks the support from the National Key Research and Development Program of China (2019YFA0705900) funded by MOST, the Research Grants Council of Hong Kong (R6021-18, 16305915, 16322416, 606012, and 16303917), the Shenzhen Technology and Innovation Commission (JCYJ20170413173814007 and JCYJ20170818113905024), and Hong Kong Innovation and Technology Commission for the support through projects ITC-CNERC14SC01 and ITS/471/18). Ruijie Ma acknowledges the support from Hong Kong PhD Fellowship Scheme (PF17-03929). Xinhui Lu thanks the Research Grant Council of Hong Kong (14314216). Funding Information: Scheme, Grant/Award Number: PF17-03929; National Natural Science Foundation of China, Grant/Award Numbers: 2019B030302007, 51961165102; the Research Grants Council of Hong Kong, Grant/Award Numbers: 14314216, 15218517, C5037-18G; Sir Sze-yuen Chung Endowed Professorship; the Basic and Applied Basic Research Major Program of Guangdong Province; the Hong Kong Research Grants Council, Grant/Award Numbers: R6021-18, 16303917, 16305915, 16322416, 606012; the Shen Zhen Technology and Innovation Commission, Grant/Award Numbers: JCYJ20170413154602102, JCYJ20170413173814007, JCYJ20170818113905024 Publisher Copyright: {\textcopyright} 2020 The Authors.",
year = "2020",
month = dec,
doi = "10.1002/eom2.12061",
language = "English",
volume = "2",
journal = "EcoMat",
issn = "2567-3173",
publisher = "John Wiley and Sons Inc.",
number = "4",
}