Solar energy is an inexhaustible source of clean (green) energy. In recent years, as countries in the world have attached importance to environmental issues, solar cells that convert solar energy into electrical energy have become a research hotspot in various countries and have been developed and promoted by industrial circles. the key of. Compared to inorganic solar cells, polymer solar cells have outstanding advantages such as low cost, simple manufacturing process, light weight, and flexibility to be prepared. In addition, a variety of conjugated polymer materials can be designed, and can be modified through materials. Effectively improve the performance of solar cells. Therefore, such solar cells have important development and application prospects and have become an important research direction.

With the support of the Ministry of Science and Technology, the National Natural Science Foundation of China, the Chinese Academy of Sciences and the Institute of Chemistry, researchers from the State Key Laboratory of Polymer Physics and Chemistry of the Chinese Academy of Sciences collaborate with organic solid scientific researchers, most recently in conjugated polymer photovoltaics. Made a series of progress on the material.

In wide bandgap polymer solar cell donor materials, wide bandgap materials such as MEH-PPV, P3HT, etc. have been used as the main materials for single layer or laminated photovoltaic devices. Recently, they designed and synthesized a thiazole-based wide-bandgap DA copolymer with an energy conversion efficiency of 5.2%, which is the highest reported value of the photoelectric conversion efficiency of polymers with a bandwidth above 2.0 eV. The results are reported on Macromolecules. (Macromolecules, 2011, 44, 4035–4037), and became the top ten of the journal's downloads for the month of publication. They 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 level. The polymer is the donor and the PC70BM is the acceptor. The open-circuit voltage of the polymer solar cell reached 0.76 V, and the energy conversion efficiency reached 6.22% (Chem. Commun., 2011, 47, 8904-8906); meanwhile, a new BDP unit was used to construct the new isomer BDP unit. The 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 groups on the BDT units of PBDTTT polymers with thiophene conjugated branches and synthesized a novel polymer PBDTTT-CT with two-dimensional conjugation (see Figure 1), with the addition of alkoxy substituents. Compared with PBDTTT-C, the hole mobility of PBDTTT-CT is significantly increased, the absorption spectrum is red-shifted, and the HOMO energy level is shifted downward, which is favorable for the improvement of photovoltaic performance. The solar energy conversion efficiency of the polymer with PBDTTT-CT donor and PC70BM as the acceptor has reached 7.6%, which is one of the highest efficiency of the current polymer-donated photovoltaic materials, which has aroused the attention of domestic and foreign academics and even the industrial community (Angew Chem. Int. Ed., 2011, 50, 9697–9702).

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