Preparation method for back contact type silicon solar cell
A silicon solar cell and back contact technology, which is applied in the manufacture of circuits, electrical components, and final products, can solve problems affecting the mechanical strength of devices, complex manufacturing processes, and broken silicon wafers, so as to improve photoelectric conversion efficiency and simplify the manufacturing process. , the effect of reducing the fragmentation rate
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Embodiment 1
[0040] see Figure 1~9 Shown, a kind of preparation method of back contact silicon solar cell, silicon chip is p-type, comprises the following steps:
[0041] The first step is texturing, the purpose of which is to form an uneven structure on the surface of the original bright silicon wafer through chemical reaction to prolong the propagation path of light on its surface, thereby improving the absorption of light by the silicon wafer 1; the silicon wafer after texturing The schematic diagram of the structure is as figure 1 shown;
[0042] The second step is to open holes 4 on the silicon wafer, the number of which is 100. Its function is to set electrodes in the holes 4 to lead the current from the light-receiving surface of the battery sheet to the backlight surface of the battery sheet, so that the positive electrode of the battery sheet Both the negative electrode and the negative electrode are located on the back of the cell; the holes can be opened by laser, mechanical...
Embodiment 2
[0052] A method for preparing a back-contact silicon solar cell, the silicon wafer is n-type, comprising the steps of:
[0053] The first step is texturing; its purpose is to form an uneven structure on the surface of the originally bright silicon wafer through chemical reaction to prolong the propagation path of light on its surface, thereby improving the absorption of light by the silicon wafer;
[0054] The second step is to open holes on the silicon wafer, the number of which is 60, and its function is to set electrodes in the through holes to lead the current from the light-receiving surface of the battery to the backlight surface of the battery, so that the positive electrode and the backlight of the battery can be connected. The negative electrodes are all located on the back of the battery sheet; in this embodiment, laser, mechanical drilling or chemical etching can be used to open holes;
[0055] The third step is to screen-print boron-containing paste on the surface ...
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