Solid electrolyte for dye-sensitized solar cell based on ionic crystals

Abstract

The invention relates to a solid electrolyte for a dye-sensitized solar cell based on ionic crystals. The solid electrolyte comprises the following ingredients including 70 to 80 weight percent of ionic crystals, 5 to 15 weight percent of Iodine and 5 to 15 weight percent of methylbenzimidazole, wherein the chemical structural formula of the ionic crystals is shown as the accompanying drawing; in the formula, s is an integer from 1 to 12, and q is an integer from 0 to 5; and the solid electrolyte also comprises the following ingredients in percentage by mass: 1 to 5 weight percent of CuAl<2>O<4>. Cyanobiphenyl groups are introduced into the ionic crystals, so that the light scattering phenomenon can be increased; the CuAl<2>O<4> is added into the electrolyte, so that a hole transport structure can be formed; therefore the hole transport structure can be combined with a light scattering structure generated by ionic crystal introduction; and the cell performance and the photoelectric conversion efficiency are improved.

Description

technical field [0001] The invention belongs to the field of dye-sensitized solar cells, in particular to a solid electrolyte for dye-sensitized solar cells based on ionic crystals. Background technique [0002] As the core component of dye-sensitized solar cells, the electrolyte mainly plays the role of transporting redox pairs, and its performance directly affects the efficiency of solar cells. [0003] Common electrolytes for dye-sensitized solar cells are liquid, quasi-solid, and solid. Among them, liquid electrolytes mostly contain organic solvents such as acetonitrile and methoxypropionitrile, which have the disadvantages of easy leakage, volatility, difficult packaging, high toxicity, and poor stability; quasi-solid electrolytes contain a small amount of ethylene carbonate, propylene carbonate, Solvents such as ionic liquids also have the problems of easy leakage and difficult packaging. Long-term use has leakage problems, which will cause a decline in battery stabil...

AI Technical Summary

Problems solved by technology

Although the highest photoelectric conversion efficiency of the dye-sensitized solar cell prepared by using this solid electrolyte is 5.7%, due to the non-polymeric ionic liquid content as high as 50wt% to 89wt%, and the selected imidazolium iodide salt with strong water absorption, During long-term use, it will inevitably absorb moisture in the air and cause leakage, which will affect the performance of dye-sensitized solar cells

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