Synthesis Of Double D-π-A Branched Dyes And Small Molecular Organic Hole Transporting Materials And Their Application In Dye-Sensitized Solar Cells

In dye sensitized solar cell, dye as the core component to capture photons, and the injection of electrons into the conduction band of the semiconductor nano effect, at the same time, the dye oxidation state and can obtain electronic regeneration from the electrolyte. Therefore plays a key role in the stability of the photoelectric conversion efficiency of the solar cell sensitizer for long-term use and process. In order to reduce the dye sensitized solar cell production costs and the pollution of the environment, development of pure organic dyes to replace the metal complex dyes is of far-reaching significance in the field of dye-sensitized solar cells.Pure organic dyes are studied for D-π-A structure, and the dyes with double D-π-A structure is relatively small, the double D-π-A structure with respect to D-π-A structure of dyes, We designed and synthesized 4 kinds of pure organic dyes, including two with double D-π-A structure, the other two as compared to also have two electron donating groups, but only one electron withdrawing groups. At the same time, spectrum and carbon spectrum and structure characterization of these compounds was carried out by using 1H nmr. And the study of their photophysical properties, the research of its application in dye sensitized solar cell system, the relationship between dye structure and battery performance. The photoelectric conversion efficiency of D-L dye reached 6.06%, the photoelectric conversion efficiency in the single electron withdrawing group compared to the S-L4.56%, there are about 25% increase. This shows that the double D-π-A dye structure rationality and broad research prospect.Because the traditional liquid electrolyte are easy to corrosion, easy to leak, not easy to carry and other defects,seriously limits the commercial application prospect. Solid state dye sensitized solar cell can avoid these defects,but also provide the necessary condition for the commercial application of dye sensitized solar cells.Thiophene derivatives is very important in organic photovoltaic materials to a large class, it has relatively modest energy gap, a wide spectral response, also has to quantify the environmental stability and thermal stability. So, we design and synthesis of thiophene derivatives of hole transport materials based on four kinds of. Spectrum and carbon spectrum, the structural characterization of these compounds by NMR mass spectrometry. And the study of their photophysical properties and photochemical properties. Finally, its application in perovskite cell, the four hole transport materials used in photoelectric conversion efficiency of the perovskite cell reached 1.13%,8.03% and 7.23%,11.16%, of which SBP-OMe the conversion efficiency of reached highest 11.16% can be Spiro-OMeTAD as a potential replacement products.