Organic photovoltaic cells are highly valued for their lightweight design, flexibility, and ability to be processed via solutions. These features make them ideal for emerging applications like wearable tech, portable power sources, and even integrated photovoltaic building designs. As a cutting-edge energy technology, they hold significant potential for widespread adoption. In recent years, advancements in organic photovoltaic materials and fabrication techniques have pushed efficiencies above 19%, marking a major leap forward. However, challenges like achieving large-scale printing production and ensuring long-term mechanical stability continue to hinder their commercial viability.
Recently, a team from the Qingdao Institute of Bioenergy and Process Chemistry, led by Dr. Bao Xichang, proposed a novel approach to address these issues. By using a ternary strategy that combines functional solid additives, they successfully enhanced both the efficiency and mechanical resilience of flexible organic photovoltaic cells. Drawing inspiration from earlier studies (published in Energy & Environmental Science, 2021, 14, 5968-5978), the team designed a polymer donor named PBB1-F, which they incorporated into existing material combinations such as PM6:Y6-BO-4Cl and PM6:BTP-eC9. This addition significantly improved photon absorption and molecular aggregation within the active layers. Additionally, they explored the benefits of introducing strong adhesive polyarylether solid additives to boost the dielectric properties and overall durability of the cells.
The resulting ternary rigid thin-film devices demonstrated impressive efficiencies—17.91% for PM6:PBB1-F:Y6-BO-4Cl and 18.51% for PM6:PBB1-F:BTP-eC9. Further investigation revealed that these improvements stemmed from faster charge extraction and reduced recombination losses. Notably, the thicker 300nm rigid films achieved efficiencies of 16.40% and 16.84%, while flexible versions reached 14.78% and 14.95%. Perhaps most impressively, the flexible thick-film devices maintained around 90% of their initial performance even after being bent 1,000 times at a radius of 10mm. This breakthrough offers a practical pathway to overcoming key obstacles in the development of flexible photovoltaics.
This pioneering work was featured on the inside cover of *Advanced Energy Materials*. The project received support from institutions including the Ministry of Science and Technology, the National Natural Science Foundation of China, and Shandong Energy Research Institute.
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This advancement represents a critical step toward realizing the full potential of organic photovoltaics. While challenges remain, the progress made here opens up exciting possibilities for integrating renewable energy solutions into our daily lives.
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