The vertical phase distribution of the activelayer and the effective interface contact between the activelayer and transport layer are crucial for the photovoltaic per-formance of organic solar cells (OSCs). We synthe...The vertical phase distribution of the activelayer and the effective interface contact between the activelayer and transport layer are crucial for the photovoltaic per-formance of organic solar cells (OSCs). We synthesized an α-diketone-based polymeric donor PBTO, which was applied tobridge the copper(I) thiocyanate CuSCN and the active layer inOSCs. PBTO exhibited perfectly complementary absorptionwith those of PM6 and BTP-eC9, and the poor solubility ofBPTO in toluene renders it a layer. The coordination of con-tact between the PBTO and the CuSCN surface enhanced thebinding strength of both materials. Moreover, due to closersurface energy, PBTO can induce a favorable vertical phasedistribution in the upper active layer to achieve a p-i-n-likeconfiguration, effectively reducing carrier recombination los-ses. Through the multiple roles of the bridging agent PBTO,we achieved a wide range of photon capture, efficient chargetransport, and reduced carrier recombination. Ultimately, thedevice power conversion efficiency reached 19.02%. Our re-search results present a strategy for synergistically improvingcharge transport and optimizing vertical phase distribution inOSCs, offering new insights into the polymer molecular de-sign.展开更多
基金supported by the National Natural Science Foundation of China (22379011 and 52373169)。
文摘The vertical phase distribution of the activelayer and the effective interface contact between the activelayer and transport layer are crucial for the photovoltaic per-formance of organic solar cells (OSCs). We synthesized an α-diketone-based polymeric donor PBTO, which was applied tobridge the copper(I) thiocyanate CuSCN and the active layer inOSCs. PBTO exhibited perfectly complementary absorptionwith those of PM6 and BTP-eC9, and the poor solubility ofBPTO in toluene renders it a layer. The coordination of con-tact between the PBTO and the CuSCN surface enhanced thebinding strength of both materials. Moreover, due to closersurface energy, PBTO can induce a favorable vertical phasedistribution in the upper active layer to achieve a p-i-n-likeconfiguration, effectively reducing carrier recombination los-ses. Through the multiple roles of the bridging agent PBTO,we achieved a wide range of photon capture, efficient chargetransport, and reduced carrier recombination. Ultimately, thedevice power conversion efficiency reached 19.02%. Our re-search results present a strategy for synergistically improvingcharge transport and optimizing vertical phase distribution inOSCs, offering new insights into the polymer molecular de-sign.
