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Molecular structures of polymer donors and non-fullerene acceptor materials and volt-ampere curves of corresponding OSCs
Organic Solar Cells (OSCs) is a new type of device that converts solar energy into electricity. The main parameter for evaluating its performance is the energy conversion efficiency (PCE). At present, researchers have used polymers or small molecules as electron donor materials and fullerene derivatives as electron acceptor materials. The prepared OSCs have achieved more than 11% of PCE. In recent years, in order to improve the difficulty in absorption spectroscopy and molecular energy level modulation of fullerene receptor materials, researchers have shifted the research center to non-fullerenic electron acceptor materials, and developed and applied a variety of high performance. The electron acceptor materials, such as polymer N2200, small molecule ITIC, etc., based on this OSCs showed very good photovoltaic performance.
Recently, under the support of the Chinese Academy of Sciences and the National Natural Science Foundation of China, the researcher of the Hou Jianhui Research Group of the Polymer Physics and Chemistry Laboratory of the Institute of Chemistry, Chinese Academy of Sciences researchers simultaneously optimized the donor and acceptor materials in the OSCs, and based on this, prepared OSCs, which achieve more than 13% of PCE, are the world's highest reported results in the current OSCs (J. Am. Chem. Soc. 2017, 139, 7148-7151). They introduced fluorine atoms into the polymer donor PBDB-T and the non-fullerene receptor ITIC, and designed and synthesized novel donor and acceptor PBDB-T-SF and IT-4F (shown below). The absorption performance of the new type of donor and acceptor materials is significantly higher than that of the original, resulting in a significant increase in the short-circuit current density of the corresponding OSCs, obtaining 13% of the PCE, and has been certified by the China Institute of Metrology. In addition, the OSCs can maintain excellent performance over a wide range of film thickness and storage for a long time, which is of great significance to the practical application of OSCs.
The results of this study show that the molecular design and optimization of photoactive materials can effectively enhance the PCE of OSCs, and at the same time, it also proves that non-fullerene-type OSCs have a broad space for development and have great potential for future industrial applications.
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