<scp>Host‐Guest</scp> Strategy Enabling Nonhalogenated Solvent Processing for <scp>High‐Performance All‐Polymer</scp> Hosted Solar Cells<sup>†</sup>
Yuting Huang, Haiyang Chen, Qunping Fan, Ziyuan Chen, Junyuan Ding, Heyi Yang, Zhe Sun, Rui Zhang, Weijie Chen, Changduk Yang, Feng Gao, Yaowen Li
Abstract
Comprehensive Summary The power conversion efficiencies (PCEs) of all‐polymer solar cells (all‐PSCs), usually processed from low‐boiling‐point and toxic solvents, have reached high values of 18%. However, poor miscibility and uncontrollable crystallinity in polymer blends lead to a notable drop in the PCEs when using green solvents, limiting the practical development of all‐PSCs. Herein, a third component (guest) BTO was employed to optimize the miscibility and enhance the crystallinity of PM6/PY2Se‐F host film processed from green solvent toluene ( TL ), which can effectively suppress the excessive aggregation of PY2Se‐F and facilitate a nano‐scale interpenetrating network morphology for exciton dissociation and charge transport. As a result, TL ‐processed all‐polymer hosted solar cells (all‐PHSCs) exhibited an impressive PCE of 17.01%. Moreover, the strong molecular interaction between the host and guest molecules also enhances the thermal stability of the devices. Our host‐guest strategy provides a unique approach to developing high‐efficiency and stable all‐PHSCs processed from green solvents, paving the way for the industrial development of all‐PHSCs.