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Low-temperature synthesis method of titanium-dioxide-based nanocrystal for light anode of solar cell

A solar cell and titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, photosensitive equipment, etc., can solve the problems that the crystallinity of the film needs to be improved, reduce the crystallization temperature of the tantalum pentoxide film, etc., and achieve good dispersion, The effect of high conversion efficiency

Inactive Publication Date: 2013-07-03
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhang Yanrong and others prepared anatase titanium dioxide film in an ice-water bath by electrophoresis, but the crystallinity of the film needs to be improved (CN101608330A)
In addition, Lu et al. lowered the crystallization temperature of tantalum pentoxide thin films by means of gas pressurization (Journal of the European Ceramic Society, 2006, 26, 2753-2759). At present, no pressurization method has been applied to the preparation of other The reports of oxide nanocrystals, especially the method of preparing nanocrystals at low temperature by the reaction supercharging method, have not been reported at home and abroad.

Method used

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  • Low-temperature synthesis method of titanium-dioxide-based nanocrystal for light anode of solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Pour 0.06 mol of tetrabutyl titanate into a high-pressure container, add 1.80 mol of ethanol, and stir thoroughly. After mixing evenly, add 0.04 mol of concentrated nitric acid, and slowly add 0.10 mol of deionized water dropwise after stirring for 5 minutes , keep stirring vigorously during the dropwise addition. After the dropwise addition, continue to stir for 0.5 h, then add 0.85 mol of hydrogen peroxide, and after standing for 10 s, seal the container, keep stirring and keep warm at 90° C. for 18 h to prepare pure titanium dioxide nanocrystalline particles.

[0020] The X-ray diffraction (XRD) pattern of the prepared pure titanium dioxide nanocrystals is shown in figure 1 As shown, its diffraction peaks are consistent with the standard spectrum of anatase phase titanium dioxide, indicating that the obtained product is anatase phase titanium dioxide. Calculated by Scherrer equation (Scherrer equation), the average crystal diameter is 8.9nm. The solar ce...

Embodiment 2

[0024] Example 2: Pour 0.02 mol of isopropyl titanate into a high-pressure container, add 0.01 mol of zinc acetate, then add 1.40 mol mL of ethanol, stir thoroughly, after mixing evenly, add 0.06 mol of diethanolamine, and stir for 5 minutes Finally, 0.05 mol of deionized water was slowly added dropwise, and vigorous stirring was maintained during the dropwise addition. After the dropwise addition, continue to stir for 0.5h, then add 0.02mol of zinc carbonate, and after standing for 10s, seal the container, keep stirring and keep warm at 98°C for 26h to prepare zinc-doped titanium dioxide-based nanocrystalline particles. The diameter is 10.9nm. The assembly and performance testing of the solar cell are the same as in Example 1. The test results show that the open circuit voltage is 0.74V and the short circuit current is 11.78mA / cm 2 , the fill factor is 0.652, and the photoelectric conversion efficiency is 5.68%.

Embodiment 3

[0025] Example 3: Pour 0.09 mol of tetrabutyl titanate into a high-pressure container, add 0.005 mol of tantalum ethoxide, then add 1.98 mol of isopropanol, and stir thoroughly. After mixing evenly, add 0.08 mol of concentrated hydrochloric acid, and stir After 5 minutes, 0.15 mol of deionized water was slowly added dropwise, and vigorous stirring was maintained during the dropwise addition. After the dropwise addition, continue to stir for 1 hour, then add 1.05 mol of hydrogen peroxide, and after standing still for 15 seconds, seal the container, keep stirring and keep warm at 95°C for 22 hours to prepare titanium dioxide-based nanocrystalline particles doped with tantalum, with an average particle size of 9.5nm. The assembly and performance testing of the solar cell are the same as in Example 1. The test results show that the open circuit voltage is 0.77V and the short circuit current is 12.08mA / cm 2 , the fill factor is 0.658, and the photoelectric conversion efficiency i...

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Abstract

The invention discloses a low-temperature synthesis method of a titanium-dioxide-based nanocrystal for a light anode of a solar cell, belonging to a low-temperature synthesis method of nanocrystals for solar cells. The synthesis method comprises mixing a titanium dioxide precursor and a dopant in an alcohol, adding a hydrolysis inhibitor to control the hydrolysis rate of the titanium dioxide precursor, and thus forming a solution containing titanium-dioxide-based nanoparticles; and converting the titanium-dioxide-based nanoparticles into nanocrystal, firstly adding a decomposition agent, and preparing titanium-dioxide-based nanocrystal with high photoelectric conversion efficiency by using a reaction pressurized induced crystallization method. The synthesis method disclosed by the invention has the advantages that: 1, titanium-dioxide-based nanocrystal can be synthesized under low-temperature conditions of 60-100 DEG C,, thus the preparation of high-conversion-efficiency light anode of the solar cell at low temperature is achieved; and 2, by adding the decomposition agent, not only is the titanium dioxide-based nanocrystal with grain size about 10 nm synthesized, but also the synthesized nanocrystal has better dispersity.

Description

technical field [0001] The invention relates to a low-temperature synthesis method of nanocrystals for solar cells, in particular to a low-temperature synthesis method of titanium dioxide-based nanocrystals for photoanodes of solar cells. Background technique [0002] Titanium dioxide-based nanocrystals are the main material for photoanodes of solar cells, and the preparation methods can be divided into physical deposition methods and chemical preparation methods. The physical deposition method usually has a high deposition temperature, and the deposition equipment is complicated and expensive. Chemical preparation mainly includes liquid phase precipitation method, sol-gel method and hydrothermal method. The liquid-phase precipitation method and the sol-gel method prepare amorphous titanium dioxide. If it needs to be converted into nanocrystals, subsequent high-temperature treatment is required; although the hydrothermal method can prepare titanium dioxide-based nanocrystal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053H01G9/042H01G9/20
Inventor 许程强颖怀刘炯天
Owner CHINA UNIV OF MINING & TECH