Electrochemical treatment method for modifying the surface properties of copper-zinc-tin-sulfur thin-film solar cells absorber layer

A thin-film solar cell, copper-zinc-tin-sulfur technology, applied in the field of solar cells, can solve the problems of serious environmental pollution and high cost, and achieve the effects of environmental friendliness, low cost and short processing time

Active Publication Date: 2017-03-29
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The main purpose of the present invention is to provide an electrochemical treatment method for modifying the surface properties of copper-zinc-tin-sulfur thin films in view of the problems of serious environmental pollution and high cost in the prior art

Method used

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  • Electrochemical treatment method for modifying the surface properties of copper-zinc-tin-sulfur thin-film solar cells absorber layer
  • Electrochemical treatment method for modifying the surface properties of copper-zinc-tin-sulfur thin-film solar cells absorber layer
  • Electrochemical treatment method for modifying the surface properties of copper-zinc-tin-sulfur thin-film solar cells absorber layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 This example is an electrochemical method to modify the surface of copper-zinc-tin-sulfur film

[0043] Metal Mo with a thickness of 1 μm is deposited on the soda-lime glass substrate as a back electrode, and a copper-zinc-tin-sulfur thin film with a thickness of 1-2 μm is deposited on the Mo layer 4 by electrochemical deposition, which is a prefabricated layer.

[0044] Step (1): The copper-zinc-tin-sulfur thin film material is selenized in a constant temperature tubular annealing furnace, and then placed on the electrochemical workstation, only the substrate 3 and the Mo4 back electrode are connected to the working electrode of the electrochemical workstation 1; Soak in ethanol for 1-2 minutes, remove surface particles and impurities, and blow dry with high-purity nitrogen;

[0045] Step (2) Prepare treatment solution 7. The treatment solution is a mixed solution of zinc sulfate, sulfuric acid and deionized water, and the pH value of the treatment solution ...

Embodiment 2

[0048] Example 2 This example is an electrochemical method to modify the surface of copper-zinc-tin-sulfur film

[0049] Metal Mo with a thickness of 500nm is deposited on a molybdenum foil substrate with a thickness of 100 μm as the back electrode, and a copper-zinc-tin-sulfur film with a thickness of 1-2 μm is deposited on the Mo layer 4 by electrochemical deposition. This layer of film is prefabricated layer.

[0050] Step (1): The copper-zinc-tin-sulfur thin film material is selenized in a constant temperature tubular annealing furnace, and then placed on the electrochemical workstation, only the substrate 3 and the Mo4 back electrode are connected to the working electrode of the electrochemical workstation 1; Soak in ethanol for 1-2 minutes, remove surface particles and impurities, and blow dry with high-purity nitrogen;

[0051] Step (2): Prepare treatment solution 7. The treatment solution is a mixed solution of sodium nitrate, nitric acid and deionized water, and the...

Embodiment 3

[0054] Example 3 This example is an electrochemical method to modify the surface of copper-zinc-tin-sulfur film

[0055] Metal Mo with a thickness of 1 μm is deposited on the soda-lime glass substrate as a back electrode, and a copper-zinc-tin-sulfur thin film with a thickness of 1-2 μm is deposited on the Mo layer 4 by electrochemical deposition, which is a prefabricated layer.

[0056] Step (1): The copper-zinc-tin-sulfur thin film material is selenized in a constant temperature tubular annealing furnace, and then placed on the electrochemical workstation, only the substrate 3 and the Mo4 back electrode are connected to the working electrode of the electrochemical workstation 1; Soak in ethanol for 1-2 minutes, remove surface particles and impurities, and blow dry with high-purity nitrogen;

[0057] Step (2) Prepare treatment solution 7. The treatment solution is a mixed solution of sodium chloride, hydrochloric acid and deionized water, and the pH value of the treatment so...

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Abstract

The invention relates to the technical field of solar cells, and specifically discloses an electrochemical treatment method for modifying surface properties of an absorption layer of a copper zinc tin sulfide thin film solar cell. The method includes the steps of: placing a copper zinc tin sulfide tin film material in an electrochemical workstation after selenylation (or sulfuration) in a constant temperature tubular annealing furnace, and connecting a substrate and Mo with a working electrode; putting the copper zinc tin sulfide thin film material in a treatment solution which is a mixed solution of 0.001 to 1 M / L salt, inorganic acid and deionized water; and applying an electrical signal which is any one of a cyclic voltammetry electrical signal, constant voltage electrical signal, constant current electrical signal, pulse voltage electrical signal or pulse current electrical signal. The method provided by the invention can remove a high-conductivity copper-rich phase on the surface of the copper zinc tin sulfide thin film, optimizes interface characteristics of a pn junction of a solar cell device, improves performance output of the cell, is environment-friendly and reduces cost.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to an electrochemical treatment method for modifying the surface properties of an absorbing layer of a copper-zinc-tin-sulfur thin film solar cell. Background technique [0002] Solar energy is the most abundant energy among many renewable energy sources. The energy of global sunlight for one hour is equivalent to the energy consumption of the earth for a year, which is much higher than wind energy, geothermal energy, hydropower, ocean energy, biomass energy and other energy sources. The proportion of solar energy in the future energy structure will increase, and it is conservatively estimated that this proportion will exceed 60% in 2100. Therefore, solar cell research is an important topic for future energy development. [0003] Zinc tin sulfur (CuZn x sn y S z , can also include selenium Se, abbreviated as CZTS) is a derivative of copper indium gallium selenium CIGS, the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 何绪林张永政廖成刘江叶勤燕梅军刘焕明
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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