Research on the regulation of organic solar cells using insulating resins by Qingdao Energy obtained series

Organic solar cells offer several advantages such as lightweight, flexibility, and solution-processability, making them promising candidates for applications in wearable electronics, photovoltaic building integration, and photovoltaic agriculture. However, their inherent limitations—such as high exciton binding energy due to a low dielectric constant and weak built-in electric field—pose significant challenges. These factors hinder effective exciton dissociation, leading to lower photocurrents compared to inorganic systems with similar band gaps. Moreover, during the photothermal process, severe self-aggregation within the photosensitive layer can cause excessive phase separation, impairing the formation of a well-ordered interpenetrating network. This results in poor exciton dissociation and transport, ultimately affecting the photothermal stability of organic photovoltaics. To address these issues, Dr. Bao Xichang from the Qingdao Institute of Bioenergy and Process, Chinese Academy of Sciences, has achieved notable advancements based on prior research (Adv. Funct. Mater. 2020, 30, 2003654). By leveraging the distinct solubility properties of polyarylether and photovoltaic acceptor materials, combined with a layer-by-layer coating technique, they fabricated planar heterojunction organic solar cells. This approach not only enhances molecular packing in the photosensitive layer but also improves charge recombination and extraction efficiencies. Consequently, these devices achieved a remarkable power conversion efficiency of 18.6%. Furthermore, the insulating resin embedded within the photosensitive layer forms a matrix network structure, which mitigates material self-aggregation and boosts the photothermal stability of the device. These findings were reported in ACS Energy Letters. Building on this work, researchers discovered that polyarylether materials distribute uniformly throughout the photosensitive layer. This observation led to the development of an innovative concept in organic photovoltaics—the "pin"—which enhances the dielectric constant and built-in electric field of the photosensitive layer. This advancement optimizes carrier transmission and collection efficiency. The corresponding study was published in Nano Energy. These efforts uncover a novel mechanism by which insulated polyarylether resin materials enhance the overall performance, photothermal stability, and flexible mechanical properties of organic solar cells. This opens up fresh avenues for designing highly efficient and stable organic photovoltaic devices. [Image: Insulated polyarylether resin enhances the performance and photothermal stability of devices] The image illustrates how the incorporation of polyarylether resin significantly improves the structural integrity and functional stability of organic solar cells under varying environmental conditions. This breakthrough underscores the potential of advanced material engineering in advancing renewable energy technologies.

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