Dye-sensitized nanocrystalline thin film solar cell with light trapping structure

A solar cell and dye sensitization technology, applied in the field of solar cells, can solve the problems of affecting the number of photogenerated electrons, reducing the adsorption of dye molecules, limited light absorption and utilization, etc. Effect

Inactive Publication Date: 2013-03-20
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure has limited absorption and utilization of light after all, and it cannot achieve the purpose of trapping light.
Moreover, the specific surface area of ​​large-particle nanocrystals is low, which reduces the adsorption of dye molecules and affects the number of photogenerated electrons.

Method used

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  • Dye-sensitized nanocrystalline thin film solar cell with light trapping structure
  • Dye-sensitized nanocrystalline thin film solar cell with light trapping structure
  • Dye-sensitized nanocrystalline thin film solar cell with light trapping structure

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Experimental program
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Effect test

Embodiment 1

[0037] FTO conductive glass was used as a substrate, and anatase titanium dioxide (n=2.5) and rutile titanium dioxide (n=2.7) powders with different particle sizes were used to prepare photoanode films.

[0038] Pretreatment of the conductive substrate: Firstly, put the conductive glass into detergent, deionized water, and absolute ethanol for ultrasonic cleaning respectively. The ultrasonic time is 10-30min, and it is dried at 50-100°C.

[0039] The preparation methods of various powders are as follows:

[0040] Preparation of anatase and rutile powder: Dissolve an appropriate amount of tetrabutyl titanate in absolute ethanol, and add deionized water drop by drop under stirring until no white precipitate occurs. The white precipitate was washed, dried, divided into two parts, and calcined at 450° C. and 700° C. for 2 hours respectively to obtain anatase and rutile titanium dioxide powders with particle diameters in the range of 100-700 nm.

[0041] Rutile TiO 2 Preparation ...

Embodiment 2

[0047] Using FTO conductive glass as the substrate, using anatase titanium dioxide (n=2.5) and rutile TiO 2 (n=2.7) microspheres assembled with nanorods to prepare photoanode films. The preparation methods of various powders are as follows:

[0048] Dissolve an appropriate amount of tetrabutyl titanate in absolute ethanol, and add deionized water drop by drop under stirring until no white precipitate occurs. The white precipitate was washed, dried, and calcined at 450° C. for 2 hours to obtain anatase titanium dioxide powder with a particle size in the range of 100-700 nm. TiCl 4 As titanium source, hydrochloric acid solution as solvent, rutile TiO was prepared by hydrothermal method 2 Microspheres assembled with nanorods, wherein the cross-sectional width of a single nanorod is 400-600 nm, and the diameter of the assembled microspheres is about 7 μm.

[0049] With terpineol and ethyl cellulose as additives, an anatase-type titanium dioxide slurry with a solid content of 2...

Embodiment 3

[0051] Using FTO conductive glass as a substrate, tin dioxide (n=2.0), anatase titanium dioxide (n=2.5) and rutile titanium dioxide (n=2.7) powders were used to prepare photoanode films. The preparation methods of various powders are as follows:

[0052] Dissolve an appropriate amount of tetrabutyl titanate in absolute ethanol, and add deionized water drop by drop under stirring until no white precipitate occurs. The white precipitate was washed, dried, divided into two parts, and calcined at 450° C. and 700° C. for 2 hours respectively to obtain anatase and rutile titanium dioxide powders with particle diameters in the range of 100-700 nm. Take appropriate amount of SnCl 4 ·5H 2 O is dissolved in PEG200, and after calcining, tin dioxide powder with a particle size of about 500nm is obtained. With terpineol and ethyl cellulose as additives, the above powders were respectively configured into a slurry with a solid content of 20%, wherein the tin dioxide slurry was expressed ...

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Abstract

The invention discloses a dye-sensitized nanocrystalline thin film solar cell with a light trapping structure. The dye-sensitized nanocrystalline thin film solar cell with the light trapping structure comprises a photo-anode, electrolyte and a counter electrode, wherein the photo-anode mainly comprises a conductive substrate and a nanocrystalline film; the nanocrystalline film consists of at least one layer of unit thin film; each layer of unit thin film is formed by laminating more than three layers of nanocrystalline thin films with different refractive indexes; and the light refractive indexes of the nanocrystalline thin films of the outmost layers on the two sides of the unit thin film are lower than the light refractive index of each nanocrystalline thin film of the inner layer of the unit thin film, and the light refractive indexes of each nanocrystalline thin film of the inner layer are gradually increased or gradually increased and then gradually decreased along a light projection direction. The cell provided by the invention fulfills the aim of trapping light by the scattering and complete reflection of light, is prepared from a wide range of materials by a simple preparation method, has a wide application range and can greatly enhance the light absorption and utilization of the thin films, thereby greatly optimizing the photoelectric conversion efficiency of the cell.

Description

technical field [0001] The invention belongs to the field of solar cells, and mainly relates to a dye-sensitized nanocrystalline solar cell with a light-trapping structure and a preparation method thereof. Background technique [0002] Facing the severe environment, energy crisis and global energy conservation and emission reduction requirements, it is urgent to find new energy sources. As an inexhaustible and inexhaustible renewable clean energy, solar energy has attracted more and more attention from various countries. Solar cells, which directly convert light energy into electrical energy, are one of the most efficient ways to utilize solar energy. At present, the most mature research technology is silicon solar cells, and industrialized production has been realized, but its high cost and cumbersome preparation process limit its large-scale application. As a new generation of solar cells, dye-sensitized nanocrystalline solar cells (DSSCs) have attracted people's attenti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01G9/04H01G9/20H01M14/00H01L51/44H01L51/48
CPCY02E10/542Y02E10/549Y02P70/50
Inventor 周幸福潘浩
Owner NANJING TECH UNIV
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