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Method for modulating Fermi level of optical anode of dye sensitized solar cell through trace N-type doping

An N-type, trace technology, applied in the field of preparation of photoanodes of dye-sensitized solar cells, to achieve the effect of increasing carrier concentration, improving Fermi energy level, and low cost of preparation process

Inactive Publication Date: 2011-12-28
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For porous TiO as the basic framework of dye-sensitized solar cells 2 Broadband semiconducting thin films, except for a small amount of research exploring the improvement of porous TiO 2 Beyond the conductivity of thin films, the modulation of the Fermi level of broadband semiconductors by doping and its effect on the performance of dye-sensitized broadband semiconductor solar cells has been largely unexplored.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0012] 1. Take 10ml of titanium isopropoxide and 2.1g of acetic acid, mix them evenly, pour them into 50ml of water, stir at room temperature for 1 hour, then add 0.68ml of nitric acid, and heat up to 80°C for degumming.

[0013] 2. During the degumming process, an aqueous solution of ammonium molybdate was added to the sol according to the molybdenum-titanium atomic ratio of 5 ppm.

[0014] 3. After degumming for 3 hours, the sol was fixed to 63ml, poured into the lining of a hydrothermal kettle, and kept at 230°C for 12 hours.

[0015] 4. Take out the precipitate in the lining of the hydrothermal kettle, add dropwise 0.4ml of nitric acid, stir at room temperature for 30 minutes, then move it into an ultrasonic instrument, set the ultrasonic power to 200W, ultrasonic for 30 minutes, then rotary steam to 20ml, and Add 0.56 g of polyethylene glycol and 0.5 ml of polyethylene glycol octylphenyl ether, and stir for 12 hours.

[0016] 5. Apply the slurry obtained in 4 to the...

Embodiment approach 2

[0021] 1. As described in Embodiment 1.

[0022] 2. During the degumming process, according to the molybdenum-titanium atomic ratio of 10ppm, add ammonium molybdate aqueous solution to the sol.

[0023] 3~6 are as described in Embodiment 1.

[0024] 7. Photoelectric energy conversion efficiency measurement:

[0025] Test conditions: 500W simulated sunlight light source xenon lamp (Oriel 91192, USA), Keithly 2400 source meter, irradiance intensity of 100W / cm 2 , the illuminated area of ​​the battery is 0.25cm 2 . Test result: open circuit voltage V oc is 735mV, the short-circuit current density J sc 13.69 mA / cm 2 , The photoelectric conversion efficiency is 6.89%.

Embodiment approach 3

[0027] 1. As described in Embodiment 1.

[0028] 2. During the degumming process, add ammonium molybdate aqueous solution to the sol according to the molybdenum-titanium atomic ratio of 100ppm.

[0029] 3~6 are as described in Embodiment 1.

[0030] 7. Photoelectric energy conversion efficiency measurement:

[0031] Test conditions: 500W simulated sunlight light source xenon lamp (Oriel 91192, USA), Keithly 2400 source meter, irradiance intensity of 100W / cm 2 , the illuminated area of ​​the battery is 0.25cm 2 . Test result: open circuit voltage V oc is 675mV, the short-circuit current density J sc 12.20 mA / cm 2 , The photoelectric conversion efficiency is 5.50%.

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Abstract

The invention discloses a method for modulating Fermi level of an optical anode of a dye sensitized solar cell through trace N-type doping, which comprises the steps of: with a salt containing a +5 valence or +6 valence metal element is used as an N type doping source material, preparing trace N type doped titanium dioxide slurry by adopting a hydrothermal method and preparing a trace N type doped titanium dioxide nanocrystalline porous film electrode by adopting a coating method. The Fermi level of titanium dioxide nano particles is modulated through trace N type doping, which can remarkablyimprove the open-circuit voltage, the short-circuit current and the photoelectricity conversion efficiency of the dye sensitized solar cell. Meanwhile, the invention has the advantages of low cost, simple process and good repeatability, and is suitable for industrialized application.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic cells, and relates to a method for preparing a photoanode of a dye-sensitized solar cell. Background technique [0002] The reported highest efficiency of dye-sensitized solar cells is about 11%, which is far from the theoretical value. The photoelectric conversion efficiency of dye-sensitized solar cells mainly depends on the short-circuit current, open-circuit voltage and fill factor of the cell. However, the current research on dye-sensitized solar cells is mainly focused on replacing liquid electrolytes with solid electrolytes or quasi-solid electrolytes, developing new dyes to extend the spectral coverage from the visible region to the near-infrared region, and studying new stacked tandem cell structures. wait. For porous TiO as the basic framework of dye-sensitized solar cells 2 Broadband semiconducting thin films, except for a small amount of research exploring the improvement of po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01L51/48H01G9/20H01M14/00
CPCY02E10/542Y02E10/549Y02P70/50
Inventor 赵兴中彭涛陈博磊
Owner WUHAN UNIV
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