A new chlorinated non-fullerene acceptor based organic photovoltaic cells over 12% efficiency
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A new chlorinated non-fullerene acceptor based organic photovoltaic cells over 12% efficiency CAO Rui(曹睿), CHEN Yu(陈瑜), CAI Fang-fang(蔡方方), CHEN Hong-gang(陈泓钢), LIU Wei(刘玮), GUAN Hui-lan(管慧兰), WEI Qing-ya(魏擎亚), LI Jing(李静), CHANG Qin(常秦), LI Zhe(李哲), ZOU Ying-ping(邹应萍) College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: The method to fluorinate the terminal group has achieved remarkable success and been widely used to fine-tune the intrinsic properties of organic acceptor materials. Referring to chlorination, however, it gets less attention and remains ambiguous effect on organic photovoltaic (OPV) cells. Herein, a new non-fullerene acceptor named Y19 was reported with benzotriazole as the electron-deficient core and 2Cl-ICs as the strong electron-withdrawing end groups. Y19 exhibits a wide film absorption band from 600 nm to 948 nm and low LUMO (the lowest unoccupied molecular orbital) energy level of −3.95 eV. Photovoltaic devices based on PM6:Y19 show high-power conversion efficiency (PCE) of 12.76 % with high open-circuit voltage (Voc) of 0.84 V, short-circuit current density (Jsc) of 22.38 mA/cm2 and fill factor (FF) of 68.18 %. Broad external quantum efficiency (EQE) response of over 60 % in the range of 480−860 nm can be obtained. This study demonstrates that chlorination, as a low-cost molecular design strategy, has its own superiorities to improve device performance and promote the potential application in OPV. Key words: non-fullerene acceptor; chlorination; electron-deficient core; device performance Cite this article as: CAO Rui, CHEN Yu, CAI Fang-fang, CHEN Hong-gang, LIU Wei, GUAN Hui-lan, WEI Qing-ya, LI Jing, CHANG Qin, LI Zhe, ZOU Ying-ping. A new chlorinated non-fullerene acceptor based organic photovoltaic cells over 12% efficiency [J]. Journal of Central South University, 2020, 27. DOI: https://doi.org/10.1007/s11771-020-4501-0.
1 Introduction Organic photovoltaic (OPV) cells, as a clean and sustainable energy technology, have attracted widespread attention due to its unique advantages, such as light-weight, translucency, flexibility and large-area preparation through roll-to-roll printing [1−3]. Over the past three decades, the power conversion efficiency (PCE) has increased to more than 16 %, owing to the great scientific advances in materials science and device technology [4−6]. At present, the photoactive layer comprising wide
band-gap polymer donors and narrow band-gap non-fullerene acceptors (NFAs) is promising as the dominant composition of high-performance organic photovoltaic (OPV) devices. This type of bulk heterojunction (BHJ) tends to obtain high photo-current with a wide range of harvesting photo from the visible (Vis) to near-infrared region (NIR) and the continuous interpenetrating network as well as the strong intermolecular interaction which mainly benefits from the development and application of NFAs [7−11]. Studies about NFAs sug
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