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Modified high-efficiency crystalline silicon solar cell and preparation method thereof

A technology of solar cells and crystalline silicon, which is applied in the field of solar cells to achieve the effects of promoting the absorption of sunlight, increasing the tap density, and improving the aspect ratio of electrodes

Inactive Publication Date: 2018-10-23
江苏昊科汽车空调有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a modified high-efficiency crystalline silicon solar cell and its preparation method to solve the small series resistance of the front silver paste and meet the requirements of environmental protection. The back field aluminum paste also has strong adhesion and water boiling resistance. Excellent physical properties without warping and high photoelectric conversion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 Preparation of modified high-efficiency crystalline silicon solar cell I

[0031] Step 1, cleaning the crystalline silicon substrate to remove the surface damage layer;

[0032] Step 2. Put the cleaned crystalline silicon substrate into a solution containing silicon dioxide nanospheres with a particle size of 300-500 nm, so that the surface of the crystalline silicon substrate is coated with a silicon dioxide nano-dispersion layer, and then the surface coated with two The crystalline silicon substrate of the silicon oxide nano-dispersed layer is placed in an alkaline solution for etching, and the etching conditions are: the alkaline solution is a tetramethylammonium hydroxide solution with a mass concentration of 7.8%wt, the temperature is 70°C, and the etching time is for 3-6min, and then respectively use the first acid cleaning solution, the second acid cleaning solution and deionized water to clean the corroded crystal silicon substrate, and the cleaning...

Embodiment 2

[0040] Embodiment 2 Preparation of modified high-efficiency crystalline silicon solar cell II

[0041] Step 1, cleaning the crystalline silicon substrate to remove the surface damage layer;

[0042] Step 2. Put the cleaned crystalline silicon substrate into a solution containing silicon dioxide nanospheres with a particle size of 300-500 nm, so that the surface of the crystalline silicon substrate is coated with a silicon dioxide nano-dispersion layer, and then the surface coated with two The crystalline silicon substrate of the silicon oxide nano-dispersed layer is placed in an alkaline solution for etching, and the etching conditions are: the alkaline solution is a tetramethylammonium hydroxide solution with a mass concentration of 7.8%wt, the temperature is 70°C, and the etching time is for 3-6min, and then respectively use the first acid cleaning solution, the second acid cleaning solution and deionized water to clean the corroded crystal silicon substrate, and the cleanin...

Embodiment 3

[0050] Example 3 Preparation of Modified High Efficiency Crystalline Silicon Solar Cell III

[0051] Step 1, cleaning the crystalline silicon substrate to remove the surface damage layer;

[0052] Step 2. Put the cleaned crystalline silicon substrate into a solution containing silicon dioxide nanospheres with a particle size of 300-500 nm, so that the surface of the crystalline silicon substrate is coated with a silicon dioxide nano-dispersion layer, and then the surface coated with two The crystalline silicon substrate of the silicon oxide nano-dispersion layer is placed in an alkaline solution for etching, and the etching conditions are: the alkaline solution is a tetramethylammonium hydroxide solution with a mass concentration of 7.8%wt, the temperature is 70°C, and the etching time is for 3-6min, and then respectively use the first acid cleaning solution, the second acid cleaning solution and deionized water to clean the corroded crystal silicon substrate, the cleaning con...

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Abstract

The invention discloses a modified high-efficiency crystalline silicon solar cell comprising a crystalline silicon substrate. The front side and back side of the crystalline silicon substrate are respectively printed with an environment-friendly conductive silver paste and a high-performance crystalline silicon solar back-field aluminum slurry by means of silk-screen printing; and then drying andsintering are carried out to form a silver grid line electrode and an aluminum back field. Compared with the prior art, the modified high-efficiency crystalline silicon solar cell has the following beneficial effects: the environment-friendly conductive silver paste uses ultra-fine silver oxide and micron silver powder for compounding, so that the resistivity is reduced; the micron silver powder has the large tap density and high sintering activity; for the high-performance back-field aluminum slurry, several kinds of aluminum powder and metal magnesium powder with different average grain sizes are used for compounding, so that the contact between the aluminum paste and the suede-like silicon wafer is improved; the wettability and interface bonding force with the aluminum liquid are enhanced by using the improved carbon nano tube; the short-circuit current and open-circuit voltage are increased; the laminated passivation film is deposited on the back side of the silicon wafer based onthe traditional process, so that the good passivation effect is realized; and the suede and the anti-reflection film are prepared on the front side of the silicon wafer, so that the solar light absorption is prompted.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a modified high-efficiency crystalline silicon solar cell and a preparation method thereof. Background technique [0002] As a kind of green energy, solar cells have attracted more and more attention due to their inexhaustible, non-polluting, and unrestricted by geographical resources. Therefore, in recent years, crystalline silicon solar cells have been used as the main solar photovoltaic power generation unit. Rapid development. In crystalline silicon solar cells, in order to obtain the largest light-receiving area, the conductivity is better, and the electrical energy generated by the silicon wafer is output to the greatest extent. This requires that the front electronic silver paste has good thixotropy and can print high-width Large gate lines have large open circuit voltage after sintering, small series resistance, and large parallel resistance. And also follow the EU'...

Claims

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Application Information

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IPC IPC(8): H01B1/02H01B1/04H01B1/08H01B1/16H01B1/22H01B13/00H01L31/0216H01L31/0224H01L31/0236H01L31/18
CPCH01B1/02H01B1/023H01B1/04H01B1/08H01B1/16H01B1/22H01B13/00H01L31/02168H01L31/022425H01L31/022441H01L31/02363H01L31/1804Y02E10/547Y02P70/50
Inventor 曹靖
Owner 江苏昊科汽车空调有限公司
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