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Photo-anode of dye-sensitized solar cell and preparation method of photo-anode

A technology of solar cells and dye sensitization, which is applied in the field of dye-sensitized solar cell photoanodes and its preparation, can solve the problems of low current density, limited electron transfer speed, low conductivity, etc., achieve high photoelectric conversion efficiency, improve electronic Transfer efficiency, effect of high current density

Inactive Publication Date: 2017-02-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The photoanode of dye-sensitized solar cells is composed of a transparent conductive glass substrate and the photoanode material on the substrate. Up to now, the photoanode material is generally used as nanoporous TiO 2 , but TiO 2 The intrinsic conductivity of the dye-sensitized solar cell is low, which limits the transfer speed of electrons in the conduction band, resulting in the rapid separation of electrons and holes in the photoanode and recombination, which makes the short-circuit current density of dye-sensitized solar cells low and the photoelectric conversion efficiency low.
[0005] Therefore, nanoporous TiO 2 Dye-sensitized solar cells as photoanode materials have the disadvantages of low current density and low photoelectric conversion efficiency

Method used

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  • Photo-anode of dye-sensitized solar cell and preparation method of photo-anode
  • Photo-anode of dye-sensitized solar cell and preparation method of photo-anode
  • Photo-anode of dye-sensitized solar cell and preparation method of photo-anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Preparation of 20% Nb-doped SrTiO by hydrothermal method 3 Nano powder:

[0024] 1mmol Sr(NO 3 ) 2 and 12.5mmol of NaOH were dissolved in 10ml of deionized water to obtain solution A, 0.8mmol of tetrabutyl titanate and 0.2mmol of niobium ethoxide were dissolved in 5ml of anhydrous butanol to obtain solution B, and 2.5ml of oleic acid was dissolved in 5ml of Obtain solution C in anhydrous butanol, mix solution A, solution B, and solution C and stir until the solutions are evenly mixed, transfer the mixed solution to a 50ml reaction water heating kettle, and react at 200°C for 24 hours after sealing, after the reaction is completed Naturally cooled to room temperature, centrifuged and washed 4 times with deionized water, and finally baked at 80 °C for 48 hours to obtain Nb-doped SrTiO 3 Nano powder.

[0025] 2. Preparation of composite slurry:

[0026] Weigh 0.002g of Nb-doped SrTiO prepared in step 1 3 Nanopowder, and 0.398g of titanium dioxide to mix the two, N...

Embodiment 2

[0032] This example discloses a method for preparing a composite photoanode, the preparation process of which is the same as that of Example 1, the only difference being that in the preparation of the composite slurry in step 2, the Nb-doped SrTiO 3 The mass of nanopowder is 0.004g, and the mass of titanium dioxide is 0.398g. After the two are mixed, Nb-doped SrTiO 3 The nano-powder accounts for 1% of the total mass of the mixed powder, and titanium dioxide accounts for 99%. The photoelectric test is carried out on the photoanode, and the test results are as follows: open circuit voltage: 0.709V, short-circuit current density: 20.90mA / cm 2 , fill factor: 0.53, photoelectric conversion efficiency: 7.855%.

Embodiment 3

[0034] This example discloses a method for preparing a composite photoanode, the preparation process of which is the same as that of Example 1, the only difference being that in the preparation of the composite slurry in step 2, the Nb-doped SrTiO 3 The mass of nano powder is 0.02g, the mass of titanium dioxide is 0.38g, and the Nb-doped SrTiO 3 The nano powder accounts for 5% of the total mass of the mixed powder, and titanium dioxide accounts for 95%. The photoelectric test is carried out on the photoanode, and the test results are as follows: open circuit voltage: 0.713V, short circuit density: 19.26mA / cm 2 , fill factor: 0.55, photoelectric conversion efficiency: 7.523%.

[0035] attached by image 3 It can be seen that the Nb-doped SrTiO prepared by the present invention 3Compared with the traditional titanium dioxide photoanode, the current density of the photoanode with different proportions of nano powder and titanium dioxide is better than that of the traditional ti...

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Abstract

The invention belongs to the field of preparation of materials for solar cells, and particularly relates to a photo-anode of a dye-sensitized solar cell and a preparation method of the photo-anode. The photo-anode comprises a transparent conductive glass substrate and a physically doped nano TiO2 thin film on the transparent conductive glass substrate, wherein the doped material is Nb-doped SrTiO3; and the thickness of the thin film is 1-7 microns. Electron-hole separation is assisted in the photo-anode by using high conductivity and a thermoelectric effect of the Nb-doped SrTiO3, so that the electron transmission efficiency of the photo-anode is improved, and the photo-anode has the properties of high current density and high photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the field of preparation of solar cell materials, in particular to a dye-sensitized solar cell photoanode and a preparation method thereof. [0002] technical background [0003] Dye-sensitized solar cells are a new type of solar cells developed based on nanotechnology in the past two decades. Because of their low cost, they are known as one of the most promising solar cells for commercial applications. In a dye-sensitized solar cell, the dye sensitizer is excited by incident photons to generate electron-hole pairs, and the electrons are quickly injected into the conduction band of the photoanode and transported to the conductive substrate through the photoanode; at the same time, the positive charge generated by photon excitation The redox electrolyte is delivered to the counter electrode to form a battery. Among them, the photoanode should not only accept the rapid injection of electrons, separate the electrons from the holes...

Claims

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Application Information

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IPC IPC(8): H01G9/20
CPCH01G9/2031H01G9/2036Y02E10/542Y02P70/50
Inventor 何泓材刘哲廷王宁刘涛
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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