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 (V_oc) of 0.84 V, short-circuit current density (J_sc) 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.

氟化端基的方法取得了显著成功，并已广泛用于微调有机受体材料的内在性能。但是，谈到氯化，它受到的关注较少，并且对有机光伏（OPV）电池仍然存在模糊的影响。在此，报道了一种新的非富勒烯受体Y19，其中苯并三唑是电子缺陷核心，2Cl-ICs是强吸电子端基。Y19表现出从600 nm到948 nm的宽薄膜吸收带，且LUMO（最低未占据分子轨道）能级低至-3.95 eV。基于PM6的光伏器件：Y19的高功率转换效率（PCE）为12.76％，高开路电压（V _oc）为0.84 V，短路电流密度（J _sc）为22.38 mA / cm ²，填充系数（FF）为68.18％。在480–860 nm范围内，可以获得超过60％的广泛外部量子效率（EQE）响应。这项研究表明，氯化作为一种​​低成本的分子设计策略，具有其自身的优势，可以改善器件性能并促进其在OPV中的潜在应用。