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Method for raising efficiency of battery prepared from dye sensitized TiO2 Nano crystal

A technology of cell efficiency and dye sensitization, used in circuits, photovoltaic power generation, electrical components, etc.

Inactive Publication Date: 2004-10-27
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the ultrafast experimental and theoretical research of the charge transfer process, the charge transfer efficiency is determined by the distance between the dye molecule and the surface adsorbed titanium atoms. The shorter the distance, the electrons are injected from the excited state of the dye molecule to the TiO2. 2 The higher the velocity in the semiconductor conduction band, the higher the efficiency of interfacial charge transfer, so the charge transfer efficiency of the simple physical adsorption state is much smaller than that of the chemically bonded adsorption state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: First prepare TiCL at low temperature 4 solution, and diluted with water to 0.2M for later use;

[0018] Second, immerse the electrode to be treated in diluted TiCl 4 In the solution, press 40-60μL / cm between the electrode and the solution 2 Equipped, after standing at room temperature for 8 hours, rinse with distilled water;

[0019] Third, sinter the treated electrode at a temperature of 450°C-550°C for 30 minutes, and the TiO 2 TiO with a particle size of ≤2nm is formed on the film 2 Nanoparticle nuclei;

[0020] Fourth, the treated electrode is subjected to dye photosensitization treatment.

Embodiment 2

[0021] Example 2: First, prepare an alcohol solution of titanyl isopropoxide at low temperature, adjust the pH value to about PH=2, then immerse the electrode to be treated in the above solution, and carry out hydrolysis at 0°C. Deposit 0.7nm TiO on the surface of the anode 2 nanoparticles, and then subject the treated electrode to dye photosensitization.

[0022] Further, the chemical deposition method is to hydrolyze titanium isopropoxide in n-hexanol solution at 0°C under acidic conditions, and deposit TiO with a particle size of 1.4 nm on the surface of the photoanode. 2 nanoparticles, and then subject the treated electrode to dye photosensitization.

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Abstract

TiO2 Nano grains with size less than and equal to 2nm are formed on surface of TiO2 Nano grain with size larger than 10 nm through chemical deposition method, thus surface state of TiO2 Nano grain is changed. Number of unsaturated titanium atoms is much more than number of TiO2 Nano grain with large size. The said changed surface state of TiO2 Nano grain possesses better characteristic of chemical adsorption so as to increase proportion of chemical adsorption of dye molecule on surface of Nano crystal. Result is to raise opto-electronic conversion efficiency of battery of TiO2 Nano crystal.

Description

technical field [0001] The invention relates to a method for improving dye sensitization TiO 2 A method for photoelectric conversion efficiency of nanocrystalline solar cells. Background technique [0002] The sustainable development of modern civilization is an important issue concerned by the governments of various countries today, in which environment and energy are two important factors. The development and utilization of solar energy can provide inexhaustible clean energy. In 1991, M. Grazel of the Institute of Advanced Technology in Lausanne, Switzerland, first published the nano-chemical solar cell technology with application and development value in the journal Nature. This technology uses very common titanium dioxide as an important raw material to make nano-films. After photosensitization, the synthetic dye is used as a photoelectrode, using a liquid electrolyte, and its photoelectric conversion efficiency is as high as 11%, while the expected industrial producti...

Claims

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Application Information

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IPC IPC(8): H01G9/20H01L31/18
CPCY02E10/542Y02P70/50
Inventor 翁羽祥张庆利都鲁超
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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