How to make a solar cell
A technology of solar cells and fabrication methods, which can be applied to circuits, photovoltaic power generation, electrical components, etc., can solve the problems of reducing the light-receiving area of solar cells and reducing photoelectric conversion efficiency, etc.
Inactive Publication Date: 2016-06-01
GINTECH ENERGY CORPORATION
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Problems solved by technology
However, in this method, during the printing and sintering of the silver glue, part of the silver glue 132 will be splashed on the outside of the electrode, such as Figure 1B As shown, if the splashed silver glue 132 is not removed first, the splashed silver glue 132 will be connected with the first electrode pattern 130a during electroplating, as shown in FIG. Figure 1C As shown, a large expanded line (front electrode 130b) is formed, which reduces the light-receiving area of the solar cell, greatly reduces its photoelectric conversion efficiency, and also violates the original purpose of using electroplating to make electrodes with thin line widths.
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Embodiment 1
[0032] Firstly, a semiconductor substrate is provided, and an anti-reflection layer is provided on the light-facing surface, and its material is silicon nitride. Next, screen-print silver glue on the anti-reflection layer as the front electrode, which includes multiple bus electrodes and multiple finger electrodes, and form the back electrode on the backlight surface, wherein the material of the back electrode is aluminum glue and silver aluminum glue. Then the electrode is sintered, the sintering step is a process of heating up in stages, in this embodiment, the sintering temperature is raised in stages from 475°C, 580°C, 585°C, 590°C, 595°C, 675°C to 970°C. After the electrode is sintered, a pre-value test is performed. The pre-value represents the basic parameter test before etching. The pre-value test results are shown in Table 1. After the sintering step, the silver glue is etched with a 25% nitric acid solution (HNO3) to remove the silver glue splashed around the electr...
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The invention provides a manufacturing method of a solar energy cell. The manufacturing method includes the steps: providing a semiconductor substrate which is provided with a light receiving surface provided with an anti-reflective layer and a shady surface; then screen printing a plurality of first electrode patterns on the anti-reflective layer; sintering the first electrode pattern; and then etching part of the first electrode, to reduce width of the first electrode; then electroplating the same materials as the first electrode on the first electrode, to form a front electrode of the solar energy cell.
Description
technical field [0001] The invention relates to a method for manufacturing a solar cell, in particular to a method for manufacturing a front electrode of a solar cell. Background technique [0002] Solar energy is an energy source that is inexhaustible and non-polluting. It has always been the focus of attention when solving the problems of pollution and shortage of petrochemical energy. Among them, solar cells can directly convert solar energy into electrical energy, which is a very important research topic at present. [0003] The most basic structure of a typical solar cell can be divided into a semiconductor substrate composed of a substrate and a P-N diode. The semiconductor substrate has a light-facing surface and a backlight surface. Each surface has a front electrode and a back electrode for external connection. The design of the front electrode of the solar cell is one of the important technologies to improve the efficiency of the solar cell. [0004] At present,...
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IPC IPC(8): H01L31/18H01L31/0224
CPCH01L31/022425Y02E10/50Y02P70/50
Inventor 陈易聪颜贤成吴家宏洪光辉柯震宇陈玄芳欧乃天黄桂武童智圣
Owner GINTECH ENERGY CORPORATION