Compared with other types of solar cells, the photoelectric conversion efficiency of organic solar cells still has a certain gap. How to obtain organic small molecule/oligomer battery materials with high photoelectric conversion efficiency presents great challenges. Recently, Wang Jinliang's research group of the School of Chemistry, Beijing Institute of Technology, and Wu Hongbin, the research group of South China University of Technology, and Liu Wei, the National Laboratory of Berkeley Lawrence, made new breakthroughs in this respect.
They used fluorobenzothiadiazole as the electron-deficient unit, led the province (IDT) as the electron-rich unit, and dithiophene as the oligomer material of the capping unit, and blended with the fullerene derivative to obtain photoelectric conversion. Organic solar cell devices with efficiencies as high as 9.1% and fill factor up to 0.77. The two sets the highest record in the donor materials of organic solar cells currently built on IDT modules and the highest in organic solar cells. The research results were published online in the American Chemical Society.
In addition, part of its work is to build a bridge between the systematic study of the relationship between small molecules and oligomers to polymers, which facilitates a more in-depth disclosure of the structure-effect relationship between “structure-performanceâ€.
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