Graphene composite dye-sensitized solar cell light anode and preparation method thereof

Abstract

The invention discloses a graphene composite dye-sensitized solar cell light anode and a preparation method thereof. The light anode of the invention is characterized in that graphene is arranged on the surface of a transparent conductive substrate, the included angle between the platy surface of the grapheme and the surface of the transparent conductive substrate is not equal to 0 degree or 180 degrees, and the included angle is 90 degrees most preferably. Compared with the prior art, the light anode of the invention not only can transfer photo produced electron to an external circuit more quickly and reduce recombination of the electron and electrolyte, but also can reduce absorption area of graphene to light and improve light utilization factor of cell, thus the light anode of the invention can improve photo electricity energy conversion efficiency; and accordingly the photo electricity energy conversion efficiency of the dye-sensitized solar cell adopting the light anode of the invention is improved by 44.7% and 15.8% respectively compared with graphene uncompounded dye-sensitized solar cell and the existing graphene compounded dye-sensitized solar cell.

Description

technical field [0001] The invention relates to the field of dye-sensitized solar cells, in particular to a photoanode of a graphene composite dye-sensitized solar cell and a preparation method thereof. Background technique [0002] 1991 Ecole Polytechnique de Lausanne, Switzerland The professor first reported the research work of dye-sensitized solar cell (Dye-Sensitized Solar Cell, DSSC) (Nature, Vol.353, 737, 1991), which has the advantages of low cost, high efficiency, low manufacturing process requirements and long life , has opened up a new way for the development of low-cost solar cells, and has become a research hotspot in the field of solar cells in recent years. [0003] A dye-sensitized solar cell consists of a photoanode, an electrolyte, and a cathode. The photoanode is composed of a semiconductor nanocrystal film formed on a conductive substrate and its surface-adsorbed photosensitive dye. The working principle of the dye-sensitized solar cell is: when the dy...

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Problems solved by technology

[0006] The photoelectric energy conversion efficiency of dye-sensitized solar cells has been successfully improved by combining graphene with semiconductor nanocrystalline film, but there are still two shortcomings that affect the photoelectric energy conversion efficiency in this method: (1) because graphene is irregular Arranged in semiconductor nanocrystalline particles, so it cannot guarantee that the photogenerated electrons can be transferred from the film to the external circuit the fastest through this randomly arranged graphene, resulting in the inability to minimize the recombination of photogenerated electrons and electrolytes; (2) Graphene With opacity, single-layer graphene will absorb 2.3% of visible light. Therefore, a large number of randomly arranged graphene in the film has a large light-absorbing area, resulting in a sharp drop in the utilization of light by the battery.

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