Solar energy is an inexhaustible clean (green) energy source. In recent years, as countries around the world pay attention to environmental issues, solar cells that convert solar energy into electrical energy have become the research hotspot of the scientific community and the development and promotion of the industry. the key of. Compared with inorganic solar cells, polymer solar cells have the outstanding advantages of low cost, simple manufacturing process, light weight, and can be made into flexible devices. In addition, there are many types of conjugated polymer materials and strong designability. Effectively improve the performance of solar cells. Therefore, this type of solar cell has important development and application prospects, and has become an important research direction. With the support of the Ministry of Science and Technology, the National Natural Science Foundation of China and the Chinese Academy of Sciences, researchers from the State Key Laboratory of Polymer Physics and Chemistry of the Institute of Chemistry have collaborated with organic solid researchers, and recently made a series of progress on conjugated polymer photovoltaic materials . Among the wide band gap polymer solar cell donor materials, wide band gap materials such as MEH-PPV and P3HT have been used as the main materials for single-layer or stacked photovoltaic devices. Recently, they designed and synthesized a wide bandgap DA copolymer based on thiazole, which has an energy conversion efficiency of 5.2%, which is the highest value of the photoelectric conversion efficiency of polymers with bandwidths above 2.0 eV. (2011, 44, 4035–4037), and became the top ten downloads of the journal in the month of publication. The researchers also introduced the electron-withdrawing group sulfone group into the PBDTTT copolymer for the first time to synthesize the polymer PBDTTT-S. The polymer has a wide absorption and a lower HOMO energy level. The polymer is used as the donor and PC70BM as The open circuit voltage of the polymer solar cell of the receptor reaches 0.76 V, and the energy conversion efficiency reaches 6.22% (Chem. Commun., 2011, 47, 8904-8906); meanwhile, the BDP unit isomer is used to construct The new polymer photovoltaic material has an open circuit voltage of up to 0.8V and an efficiency of 5.2% (Chem. Commun., 2011, 47, 8850-8852). Recently, they replaced the alkoxy group on the BDT unit of the PBDTTT polymer with a thiophene conjugated branch, and synthesized a two-dimensional conjugated new polymer PBDTTT-CT (see figure). Compared with PBDTTT-C with alkoxy substituents, the hole mobility of PBDTTT-CT is significantly improved, the absorption spectrum is red-shifted and the HOMO energy level is shifted down, which is conducive to the improvement of photovoltaic performance. The polymer solar energy conversion efficiency with PBDTTT-CT as the donor and PC70BM as the acceptor reached 7.6%, which is one of the highest efficiency of polymer donor photovoltaic materials, which has aroused the attention of domestic and foreign academic and even industrial circles (Angew . Chem. Int. Ed., 2011, 50, 9697–9702). Based on a series of research results on high-efficiency conjugated polymer photovoltaic materials based on BDT cells, they were also invited to write a review article on Polym. Chem. Molecular structure of copolymer PBDTTT-CT based on two-dimensional structural unit substituted with thiophene and its comparison with alkoxy substituted polymer PBDTTT-C Air Purifier Filter,Compressed Air Filter,Air Filter Paper Box,Activated Carbon Air Filter Ningbo Ifilter Purification Equipment CO.,Ltd. , https://www.ifiltor.com