| abstract |
The present invention provides a heteroatom-substituted benzothiadiazolyl polymer donor material and its preparation method and application. The heteroatom-substituted benzothiadiazolyl polymer donor material has the formula I structure, the polymer donor material of the present invention has a wider band gap, and the band gap widens with the increase of the heteroatom content in the benzothiadiazole unit, so that the open circuit voltage V oc of the polymer increases, thereby reaching the maximum Optimized polymer photoelectric energy conversion efficiency. Substituting heteroatoms such as fluorine, chlorine, and cyano groups on bidithiophene can increase the open circuit voltage of the polymer without losing current, thereby improving the photoelectric conversion efficiency of solar cells. Using the polymer of the present invention as a donor material to realize high-performance solar cells, the present invention optimizes the composition and structure of the polymer through the method of heteroatom substitution, and optimizes the aggregation of donor and acceptor materials and the morphology of photoelectric devices. The application of polymer solar cells has broad prospects. |