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Solar cell Cu2S/FTO counter electrode and electrochemical deposition preparation method thereof

A solar cell and electrochemical technology, applied in the field of solar cells, can solve problems such as electrolyte leakage and poor electrode mechanical stability, and achieve the effects of low cost, simple preparation process, and reliable preparation scheme

Inactive Publication Date: 2016-06-08
JILIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the invention is to overcome the deficiency that counter electrode material exists in the background technology, solve Cu 2 S / Cu has problems such as poor mechanical stability of the electrode and electrolyte leakage, and provides a simple and low-cost electrochemical deposition to prepare Cu 2 The method of S / FTO opposite electrode and the solar cell Cu prepared by this method 2 S / FTO counter electrode

Method used

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  • Solar cell Cu2S/FTO counter electrode and electrochemical deposition preparation method thereof
  • Solar cell Cu2S/FTO counter electrode and electrochemical deposition preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Preparation of FTO / TiO 2 Film: First, ultrasonically wash FTO conductive glass with detergent, distilled water, acetone, isopropanol and ethanol; then weigh 0.66g of titanium dioxide P25 with an electronic balance and dissolve it in 3mL of absolute ethanol, stir at room temperature for 24h to obtain P25 slurry. Stick scotch tape on both sides of the upper surface of the clean FTO conductive glass (that is, one side of the FTO) to form a scraping area and use it to control TiO 2 Thickness of the film, drop excess P25 slurry on the scraping area, and scrape the P25 slurry with a glass rod to form a uniform coating. After being dried naturally, it was calcined in a muffle furnace at 450°C for 60 minutes to obtain FTO / TiO 2 film.

[0014] Preparation of FTO / TiO sensitized by CdS quantum dots 2 Thin film: Quantum dots prepared by continuous ion adsorption and reaction method (SILAR), that is, FTO / TiO 2 Film immersed in 0.125MCd(NO 3 ) 2 4H 2 O in ethanol solution for ...

Embodiment 2

[0019] Preparation of FTO / TiO by the same method 2 FTO / TiO sensitized by thin films and CdS quantum dots 2 film.

[0020] Preparation of Cu 2 S / FTO counter electrode: prepare electrolyte first, containing 0.0333mol / LCuCl 2 , 6.7×10 -3 mol / L thiourea, 0.333mol / L lactic acid, and NaOH to adjust the pH of the solution to a buffer system of 6.0. A three-electrode system electrochemical workstation (CHI660A, Shanghai Chenhua Instrument Co., Ltd.) using platinum wire as the counter electrode, calomel as the reference electrode, and FTO as the working electrode deposited Cu on the FTO by a potentiostatic method, and the potential was set to -0.8V , deposition for 60min. Then prepare polysulfide solution for vulcanization: 0.5MNa 2 S·9H 2 O, 0.5MS and 0.05M KCl in methanol. Put Cu-deposited FTO into the polysulfide solution for 5 seconds, take it out, rinse it with ethanol, and dry it to obtain Cu 2 S / FTO counter electrode.

[0021] Assembled solar cells: FTO / TiO sensitized ...

Embodiment 3

[0024] Preparation of FTO / TiO by the same method 2 FTO / TiO sensitized by thin films and CdS quantum dots 2 film.

[0025] Preparation of Cu 2 S / FTO counter electrode: prepare electrolyte first, 0.05mol / LCuCl 2 , 1.3×10 -2 mol / L thiourea and 0.5mol / L lactic acid were mixed, and NaOH was used to adjust the buffer system with a pH value of 7.0. A three-electrode system electrochemical workstation (CHI660A, Shanghai Chenhua Instrument Co., Ltd.) using platinum wire as the counter electrode, calomel as the reference electrode, and FTO as the working electrode deposited Cu on the FTO by the constant potential method, and the potential was set to -1.2 V, deposited for 60 min. Then prepare the polysulfide solution for vulcanization: the polysulfide solution is 1MNa 2 S·9H 2 O, 1MS and 0.1M KCl in methanol. Put Cu-deposited FTO into the polysulfide solution for 5 seconds, take it out, rinse it with ethanol, and dry it to obtain Cu 2 S / FTO counter electrode.

[0026] Assembled...

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Abstract

The invention provides a method for preparing a solar cell Cu2S / FTO counter electrode based on the electrochemical deposition process and belongs to the technical field of solar cells. According to the method, an electrolyte is prepared firstly and then a Cu2S / FTO counter electrode is obtained in a three-electrode system through electrochemically depositing the Cu material on an FTO according to the potentiostatic method and then sulfurizing the deposited Cu material in a polysulfide solution. The above electrolyte is composed of a buffer system comprising 0.03-0.05 mol / L of CuCl2, 6.6*10<-3>-1.3*10<-2> mol / L of thiourea and 0.3-0.5 mol / L of lactic acid, and the pH value of the buffer system is 5.0-7.0. The polysulfide solution is composed of a methanol solution comprising 0.5-1 M of Na2S*9H2O, 0.5-1 M of S and 0.05-0.1 M of KCl. The method is simple in preparation process and low in cost, which provides a reliable preparation scheme for the preparation of QDSCs counter electrodes. Meanwhile, the problems of the mechanical stability and the electrolyte leakage of Cu2S / FTO counter electrodes can be solved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a solar cell Cu 2 S / FTO counter electrode and preparation method thereof by electrochemical deposition. Background technique [0002] With the consumption of fossil fuels by human beings, environmental problems and energy problems have become increasingly prominent, and the development of new energy sources is an effective solution. Solar energy is one of the ideal new energy sources, and solar cells that can convert solar energy into electrical energy are the most feasible and effective form of direct photoelectric conversion. Quantum dot-sensitized solar cells (QDSCs), one of the third-generation solar cells, have attracted much attention in both academic and industrial fields due to their low cost and high theoretical conversion efficiency. Since 1998, Nozik et al. first proposed the concept of quantum dot-sensitized solar cells. In the following decades, there have been...

Claims

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Application Information

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IPC IPC(8): H01G9/00H01G9/20C25D3/38C25D5/48C25D7/12
CPCC25D3/38C25D5/48C25D7/12H01G9/0029H01G9/2022Y02E10/542Y02P70/50
Inventor 谢腾锋邱庆庆王德军徐丹丹
Owner JILIN UNIV
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