Electrode and preparation method thereof, and dye-sensitized solar cell containing same

Abstract

The invention relates to an electrode which comprises a transparent conductive substrate, double-layer TiO2 nanoparticle films and metalgrid films, wherein the double-layer TiO2 nanoparticle films are covered on the conductive substrate in a blocky array way; the metal grid films are nested in the gaps among the blocky array of the double-layer TiO2 nanoparticle films; and the double-layer TiO2 nanoparticle film consists of a first-layer TiO2 nanoparticle film and a second-layer nanoparticle TiO2 film which are sequentially covered on the substrate. The invention also relates to a preparationmethod of the electrode and a dye-sensitized solar cell containing the electrode. The electrode of the dye-sensitized solar cell is beneficial to sufficiently absorbing light rays, can reduce the generation of dark currents and the current loss caused by the internal resistance of a transparent conductive film, and is suitable for preparing large-area dye-sensitized solar cells.

Description

technical field [0001] The invention relates to an electrode of a solar cell, in particular to an electrode of a dye-sensitized solar cell, a preparation method thereof and a dye-sensitized solar cell containing the electrode. Background technique [0002] French scientist Henri Becquerel first observed the phenomenon of photoelectric conversion in 1839, but it was not until the advent of the first practical semiconductor solar cell in 1954 that the idea of ​​"converting solar energy into electrical energy" really became a reality. There are many types of solar cells. If the material used is a narrow bandgap semiconductor material with certain absorption in the visible region, this type of solar cell is also called a semiconductor solar cell. Since the ability of the wide bandgap semiconductor itself to capture sunlight is very poor, if an appropriate dye is adsorbed on the surface of the semiconductor, with the help of the strong absorption of visible light by the dye, the...

AI Technical Summary

Problems solved by technology

However, the network structure electrode formed by sintering nanoparticles also has its problems: the number of photogenerated electrons generated on the side of the nanoparticle film close to the conductive substrate is often large, while the side close to the electrolyte is difficult to reach the light, and the adsorbed dyes are often unable to be absorbed by light. excited to generate electrons

The possible reason for this degradation is that when the area of ​​the battery increases, the resistance of the conductive film of the FTO conductive glass used as the battery substrate gradually increases, and consumes most of the photogenerated current, thereby affecting the external output power of the battery; On the other hand, when the cell area increases, the transmission path of a single photogenerated electron in the transparent conductive film also increases, thereby increasing the possibility of dark current (that is, the current in which the electrons in the conductive layer react with the electrolyte) to occur.

Images