A kind of preparation method of p-type dye-sensitized battery

Abstract

The invention relates to a preparation method of a P-type dye-sensitized battery, belonging to the fields of material preparation and solar cells. That is to use a femtosecond laser to form a fine and dense micro-nano structure on a nickel sheet, and then oxidize at a high temperature in the air to form a dense NiO layer on the nickel sheet; combined with an ultra-thin dense aluminum oxide (Al2O3) passivation layer to prepare a p-type Dye-sensitized battery; due to the micro-nano structure on the surface of the nickel sheet, the specific surface area is large, resulting in an increase in the amount of dye adsorption. In addition, because the NiO layer is directly oxidized on the nickel sheet, the two are in close contact, and the NiO layer will not When a fracture occurs, the carrier transport characteristics to the electrode are also good. And when the ultra-thin (less than 1nm) Al2O3 passivation layer reduces the charge recombination on the NiO surface, since there are only a few atomic layers, the quantum tunneling effect is obvious, so that it has little effect on electrical transmission.

Description

technical field [0001] The invention relates to a preparation method of a P-type dye-sensitized battery, belonging to the fields of material preparation and solar cells. Background technique [0002] Dye-sensitized solar cells (DSCs) have been widely studied due to their advantages of simple preparation, low cost and high efficiency; although n -type DSCs (with n- type semiconductor as a dye carrier) conversion efficiency ( n ) has reached 12%, but it is still far below the theoretical efficiency of 30%; pn-type DSCs can break through the conversion efficiency of traditional n-type DSCs. The voltage is theoretically n- type and p-type DSCs open circuit voltage, the short-circuit current depends on the photoanode and photocathode current minimum, so the photoanode and photocathode are required to match the photocurrent in value; in p-type DSCs, p-type semiconductor electrode On the one hand, as a carrier of dye, it plays the role of adsorbing dye, and on the other hand, i...

AI Technical Summary

Problems solved by technology

[0002] Dye-sensitized solar cells (DSCs) have been widely studied due to their advantages of simple preparation, low cost and high efficiency; although n -type DSCs (with n- type semiconductor as a dye carrier) conversion efficiency ( n ) has reached 12%, but it is still far below the theoretical efficiency of 30%; pn-type DSCs can break through the conversion efficiency of traditional n-type DSCs. The voltage is theoretically n- type and p-type DSCs open circuit voltage, the short-circuit current depends on the photoanode and photocathode current minimum, so the photoanode and photocathode are required to match the photocurrent in value; in p-type DSCs, p-type semiconductor electrode On the one hand, as a carrier of dye, it plays the role of adsorbing dye, and on the other hand, it also plays the role of collecting holes; at present, the short-circuit current of p-type DSCs is generally too small to match that of n-type DSCs, resulting in pn The efficiency of p-type DSCs is relatively low, which is the key problem of pn-type DSCs. The significance of developing p-type dye-sensitized solar cells is to combine them with n-type DSCs to make pn-type DSCs with high theoretical conversion efficiency.

[0003] At present, p-type DSCs often use nickel oxide (NiO) to make p-type semiconductor electrodes. The preparation methods of NiO electrodes for DSCs can be roughly divided into two categories: physical methods and chemical methods: (1) Physical methods, generally firstly make nickel-containing compounds. Then the slurry is coated / deposited on the conductive glass, and the NiO electrode is obtained by high-temperature calcination in the air, or the NiO film is prepared by the sputtering method; (2) chemical method, the nickel compound is in situ Deposited on conductive glass, calcined at high temperature in the air to obtain NiO electrode; the current problem in the preparation of nickel oxide electrode is how to obtain a dense NiO film with a certain thickness in order to increase the adsorption of dyes. In addition, femtosecond transient absorption spectroscopy studies show that , the injection of holes from dye to NiO is an ultra-fast process, however, the speed of hole return (from NiO to dye) is also very fast, such a fast return speed reduces the separation efficiency of charges, in order to improve The separation efficiency of charges, on the one hand, it is necessary to increase the injection rate of holes, and on the other hand, it is necessary to reduce the return rate of holes.

Images