A preparation method of high-efficiency composite photoanode for dye-sensitized solar cells

Abstract

The invention relates to the field of development and utilization research of new energy resources, and in particular relates to a method for preparing an efficient compound light anode of a dye sensitized solar cell. The method comprises the following steps: firstly depositing a ZnO thin film doped with In on a transparent substrate by utilizing a magnetic control sputtering technology; then growing a ZnO nanowire array on the ZnO thin film doped with In by adopting a hydrothermal chemistry reaction method; and finally coating a layer of TiO2 nano particle dispersion solution on the surface of the ZnO nanowire array through a silk screen printing technology, and heating the dispersion solution to enable an organic solvent in the dispersion solution to volatilize, thus obtaining a hole-shaped TiO2 nano crystalline porous membrane / ZnO nanowire array compound light anode structure. Each TiO2 nano particle mainly comprises small particles with the diameter about 10 nanometers, and simultaneously a small quantity of large particles with the diameter about 200 nanometers are dispersed; and the compound light anode can be used for not only improving the photosensitive dye absorption capacity and the light capture efficiency, but also improving the transport capability of photoproduction electrons, and improving the photoelectric conversion efficiency of the dye sensitized solar cell.

Description

technical field [0001] The invention relates to the research field of development and utilization of new energy, in particular to a method for preparing a high-efficiency composite photoanode of a dye-sensitized solar cell. Background technique [0002] As the core component of a dye-sensitized solar cell (DSSC), the photoanode plays a decisive role in improving the performance of the cell. To improve the photoelectric conversion efficiency of DSSC, the photoanode must meet two conditions: first, generate a large number of photogenerated electrons; second, photogenerated electrons are rapidly transmitted from the excited dye to the external circuit through the photoanode. TiO 2 Nanocrystalline porous membranes and one-dimensional ZnO nanowire arrays are the two most widely studied anode structures. TiO 2 The nanocrystalline porous film provides a large specific surface area for the photoanode, which is conducive to the adsorption of more dyes, but there are a large number...

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Problems solved by technology

TiO 2 The nanocrystalline porous film provides a large specific surface area for the photoanode, which is conducive to the adsorption of more dyes, but there are a large number of grain boundaries in it, which makes the electron diffusion coefficient small and the recombination rate high, which restricts the further improvement of the photoelectric conversion efficiency of DSSC; and Although the one-dimensional ZnO nanowire array can provide a straight-line transmission path, increase the diffusion length of electrons, reduce electron recombination, and increase electron lifetime, its adsorption to dyes is limited, making the photoelectric conversion efficiency of this type of battery unsatisfactory.

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