A solid electrolyte for dye-sensitized solar cells based on ionic crystals

Abstract

The invention relates to a solid electrolyte for dye-sensitized solar cells based on ionic crystals, which comprises the following components: 70-80 wt% of ionic crystals; 5-15 wt% of iodine simple substance; 5-15 wt% of methyl benzimidazole; The chemical structural formula of the ionic crystal is: , where: s is an integer of 1-12, q is an integer of 0-5; it also includes the following components in mass fraction: 1-5wt% CuAl2O4. Not only the cyanobiphenyl group is introduced into the ionic crystal, which can increase the light scattering phenomenon; but also by adding CuAl2O4 to the electrolyte, a hole transport structure can be formed, which can be combined with the light scattering generated by the introduction of the ionic crystal to improve Cell performance and photoelectric conversion efficiency.

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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