Changchun Yinghua made series progress in the field of all-polymer solar cells

In the conversion of light energy into electric energy, all-polymer solar cells use a blend of a p-type polymer semiconductor (donor) and an n-type polymer semiconductor (receptor) as an active layer, as compared with conventional inorganic solar cells. The outstanding advantages of flexibility, low cost, and light weight have become one of the important directions for solar cell research. However, the number and type of n-type polymer semiconductors are much smaller than those of p-type polymer semiconductors. Therefore, the development of n-type polymer semiconductor materials is the core of the development of all-polymer solar cells.

Liu Jun Group, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, proposed the use of boron-nitrogen coordination bonds (B←N) to reduce LUMO/HOMO energy levels of conjugated polymers and to develop n-type polymers. Semiconductor strategies, and the development of two types of boron-nitrogen coordination bond n-type polymer semiconductor acceptor material, its all-polymer solar cell device efficiency and classical imide n-type polymer semiconductor similar.

The research group first elucidated the basic principle of boron-nitrogen coordination bonds to reduce the LUMO/HOMO energy level of conjugated polymers. For the first time, boron-nitrogen coordination bonds were introduced into the molecular design of n-type polymer semiconductors (Angew. Chem. Int. Ed., 2015, 54, 3648). Further, two molecular design methods for designing n-type polymer semiconductor acceptor materials using boron-nitrogen coordination bonds are proposed: First, in the repeating units of conjugated polymers, a boron-nitrogen coordination bond is used to replace carbon-carbon covalent bonds. , to reduce the LUMO/HOMO level of the conjugated polymer by 0.5–0.6 eV at the same time, and to convert the common p-type polymer semiconductor donor material into an n-type polymer semiconductor acceptor material (Angew. Chem. Int. Ed. 2016, 55, 5313); Secondly, a novel electron-deficient unit based on boron-nitrogen coordination bonds, bis-boron-nitrogen-bridged bipyridyl, was designed first, and then used to construct n-type polymer semiconductor acceptor materials (Angew. Chem. Int Ed., 2016, 55, 1436).

Studies have shown that boron-nitrogen coordination bonds n-type polymer semiconductors have the characteristics of LUMO orbital delocalization and LUMO energy levels are adjustable (Chem. Sci., 2016, 7, 6197). Based on this unique electronic structure, a photonic energy loss of 0.51 eV was achieved while achieving the full polymer solar cell device efficiency of 6%, which exceeded the limit of the 0.6 eV minimum photon energy loss in conventional organic solar cells, and is also known in the literature. The lowest value (Adv. Mater., 2016, 28, 6504).

The work was funded by the Ministry of Science and Technology's "973" project, the International Natural Science Foundation, the "Yang Thousand Talent Plan" of the Central Organization Department, and the CAS's pilot project.

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