Method for electrochemical depositing solar cell metallic electrode

A technology for solar cells and metal electrodes, applied in circuits, electrical components, photovoltaic power generation, etc., can solve problems such as difficult to achieve, achieve uniform illumination intensity, solve the decline of battery efficiency, and avoid uneven deposition of metals.

Active Publication Date: 2008-09-03
WUXI SUNTECH POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, this uniform contact is difficult to achieve in industrial production

Method used

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  • Method for electrochemical depositing solar cell metallic electrode

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0082] The first step is to make a traditional solar cell:

[0083] After P-type silicon wafers are textured, diffused, edge etched, N-type surface is coated with silicon nitride, P-type surface is screen-printed with aluminum paste, N-type surface is screen-printed with silver paste, and the solar cell is measured after sintering. The photoelectric conversion efficiency is 16.57%, and its open circuit voltage, current density, series resistance, parallel resistance and fill factor are 625mV; 35.3mA / cm2; 0.0075Ω; 13.11Ω; 75.1%.

[0084] The second step is to prepare the electrolyte solution:

[0085] Preparation of copper electrolyte solution: Dissolve 200 grams of copper sulfate, 120 grams of sulfuric acid, and 4.5 milliliters of brightener VF100 into 1 liter of water evenly.

[0086] Preparation of tin electrolyte solution: 50 grams of stannous sulfate, 60 grams of sulfuric acid, 48 grams of phenolsulfonic acid, and 2.4 grams of cresol were evenly dissolved in 1 liter of wa...

no. 3 example

[0102] The first step is to make a full backside conductive electrode solar cell:

[0103] Fabricate on N-type silicon wafers, N-type diffusion, oxidation, use photoresist as a mask to open the P-type electrode contact area, P-type deep expansion, use photoresist as a mask to open the N-type electrode contact area, Electroless nickel plating is carried out on the electrode contact area, and nickel-silicon alloy is formed after nickel sintering.

[0104] The second step is to prepare the electrolyte solution:

[0105] Preparation of nickel electrolyte solution: 150 grams of nickel sulfate, 8 grams of sodium chloride, 30 grams of boric acid, and 40 grams of anhydrous sodium sulfate were evenly dissolved in 1 liter of water.

[0106] Preparation of copper electrolyte solution: Dissolve 200 grams of copper sulfate, 120 grams of sulfuric acid, and 4.5 milliliters of brightener VF100 into 1 liter of water evenly.

[0107] Copper-tin electrolyte solution: Dissolve 20 grams of cupro...

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Abstract

A method of electrochemical deposition solar cell metallic electrode includes the following steps: the cathodic surface of the solar cell contacts with the electrolyte solution; the anodic of the solar cell connects with the solid metal; the main light surface of the solar cell execute light irradiation; the metallic ion in the electrolyte solution creates metal and deposits on the cathode surface of the solar cell, after accepting the electric produced by the cathode surface of the solar cell, meanwhile the solid metal creates metallic ion into electrolyte solution, after providing electric for anodic of the solar cell. The method resolves a battery efficiency descendent problem caused by the short circuit during depositing metal on anodic, at the same time breakage solar cell piece by any electroplating rack and the inhomogeneous probable by deposited metal are avoided, and can control the electrochemical reaction velocity effectively, assure the deposited metallic homogeneity, especially for producing a solar cell with selective diffusion structure.

Description

technical field [0001] The invention relates to a method for electrochemically depositing metal, in particular to a method for electrochemically depositing a metal electrode on the cathode surface of a solar cell. Background technique [0002] At present, most of the conductive electrodes of commercial solar cells are produced by screen printing, brushing silver paste on the surface of the cathode of the solar cell, brushing aluminum paste on the surface of the anode, and then co-firing at a high temperature. Conductive cathodes and anodes are simultaneously formed on the cathode and anode of the solar cell. The advantage of this solar cell conductive electrode generation method is that the process is simple and reliable, and it is easy to be applied in large-scale production. [0003] However, the simple process of screen printing and co-firing to generate conductive electrodes for solar cells limits the improvement of the photoelectric conversion efficiency of solar cells...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCY02E10/50C25D5/006C25D7/126H01L31/022425C25D5/011
Inventor 季静佳斯图亚特·威耐姆陈丽萍施正荣
Owner WUXI SUNTECH POWER CO LTD
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