Substituting the hydrogen atoms on the conjugated side chain of a wide-bandgap polymer J52 with chlorine atoms can simultaneously increase the J_sc, V_oc, and FF of nonfullerene OSCs, leading to an efficiency boost from 3.78 to 11.53%, which is among the highest efficiencies for as-cast OSCs reported to date. To illustrate the impressive 3-fold PCE enhancement, the chlorination effect on the optical properties and energy levels of polymers, film morphology, and underlying charge dynamics is systematically investigated. Grazing incidence wide-angle X-ray scattering studies show that chlorinated J52-2Cl exhibits strong molecule aggregation, the preferred face-on orientation, and enhanced intermolecular π–π interactions, hence increasing the charge carrier mobility by 1 order of magnitude. Moreover, chlorination modifies the miscibility between the donor and acceptor and consequently optimizes the phase separation morphology of J52-2Cl:ITIC blend films. These results highlight chlorination as a promising approach to achieve highly efficient as-cast OSCs without any extra treatment.

中文翻译：

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氯化宽带隙给体聚合物，可实现11.5％的效率使游离非富勒烯太阳能电池退火

用氯原子取代宽带隙聚合物J52的共轭侧链上的氢原子可同时增加J _sc和V _oc，以及非富勒烯OSC的FF，将效率从3.78％提高到11.53％，这是迄今为止报道的铸态OSC效率最高的之一。为了说明令人印象深刻的3倍PCE增强，系统地研究了氯化对聚合物的光学性质和能级，薄膜形态和潜在电荷动力学的影响。掠入射的广角X射线散射研究表明，氯化J52-2Cl表现出较强的分子聚集性，优选的面朝性方向和增强的分子间π-π相互作用，因此使电荷载流子迁移率提高了1个数量级。此外，氯化作用改变了供体与受体之间的可混溶性，因此优化了J52-2Cl：ITIC共混膜的相分离形态。