Production method of non-homogeneous aluminum BSF solar cell
A production method and technology of solar cells, applied in the manufacture of circuits, electrical components, final products, etc., can solve the problems that solar cell manufacturers cannot determine the type of material change, problems are not easy to analyze and improve, and problem handling lags behind, so as to avoid Effects of battery breakage, reduction of wafer warpage, and reduction in usage
Inactive Publication Date: 2010-06-30
SHANGHAI JIAOTONG UNIV +1
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Problems solved by technology
However, their main direction is to change the added materials in the slurry to achieve the purpose. The effect is also different when the silicon material is uneven. For solar cell manufacturers, it is impossible to determine the type of material change. Furthermore, the problems that arise during the production process are not easy to analyze and improve in a timely manner, and it is easy to cause problems to be dealt with lagging behind
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[0016] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.
[0017] This embodiment relates to a manufacturing method of a non-uniform aluminum back field solar cell, and the specific implementation is as follows:
[0018] 1) Single crystal silicon or polycrystalline silicon wafer material selection, P type, volume resistivity 0.5-10 ohm cm, thickness 180-240nm;
[0019] 2) NaOH:Ethylpropanol cleaning, single crystal with NaOH:NaSiO 2 : Ethyl propanol for 20 minutes to make suede; polycrystalline use HNO 3 : HF20 minutes to make suede.
[0020] 3) POCl 3 Diffusion in a diffusion furnace at 860°C for 30 minutes to form a pn ...
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The invention relates to a method for manufacturing a solar cell with a non-uniform aluminum back surface field, which belongs to the technical field of semiconductors. In the method, a P type silicon chip is used as a substrate; the phosphorus oxychloride is proliferated to form a PN junction; the positive surface is provided with a silicon nitride passivation layer and an antireflection film; the positive back surface is provided with a silver electrode; and the back surface of the silicon chip is passivated to form a non-uniform aluminum back surface field which is formed by printing with a non-uniform wire mesh printing plate. The invention adopts the non-uniform aluminum back surface field in the battery process, thereby reducing the usage of aluminum paste and maintaining the characteristics of the aluminum back surface field. The use on the thin silicon chip can reduce the warping extent caused by the traditional aluminum back surface field, and prevent the battery breakage which can occur in the further battery processing and the component packaging. Due to the non-uniform aluminum back surface field, the invention facilitates the realization of the existing solar cell production line, greatly reduces the warping of the silicon chip caused by the aluminum back surface field, and prevents the basic functions of the aluminum back surface field from being influenced. Simultaneously, the invention reduces the usage of the aluminum paste and reduces the solar cell production cost.
Description
technical field [0001] The invention relates to a method for manufacturing a battery in the technical field of semiconductors, in particular to a method for manufacturing a non-uniform aluminum back field solar cell. Background technique [0002] Since the first practical silicon solar cell was born in Bell Laboratories in the United States, after more than half a century of development, crystalline silicon (including monocrystalline silicon and polycrystalline silicon) solar cells have gradually shown some of its limitations and basic defects. . Especially in the current situation where the price of silicon materials remains high and the supply is insufficient, the production of crystalline silicon cells has been greatly restricted. In order to break through this restriction, more and more new technologies have emerged, the most important of which are to continuously improve the efficiency of batteries and reduce the thickness of silicon wafers. However, with the continuo...
Claims
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IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 汪建强施旸黄建华王景霄崔容强
Owner SHANGHAI JIAOTONG UNIV