Circular silicon thin-film solar cell

Abstract

The invention discloses a round silicon thin film solar cell and a fabrication method thereof. The cell is composed of cell units connected in series, and takes a transparent substrate as a substrate, comprises a front electrode layer, a silicon thin film layer, a back electrode layer and a back paint layer which are stacked up in sequence. The round silicon thin film solar cell is characterized in that working faces of the cell units are formed by laser scribing, an external envelope takes an arc shape, a working face inside the cell is composed of n serially connected cell units which have equal effective area, n is not less than 2, at least two shielding lines and a laser scribing line or a dot-and-dash line which connects a positive electrode and a negative electrode are arranged between the positive electrode and the negative electrode of the cell, and the width between the positive electrode and the negative electrode is 0.03-0.10mm. The fabrication method adopts advanced laser marking technology, can scribe the cell units with fan-shaped or irregular figures, has high precision, and causes the width of an invalid region inside the solar cell to decrease from 0.5-1.8mm to 0.03-0.20mm, thus enlarging the effective working area of the cell.

Description

[0001] Field [0002] The invention discloses a circular silicon thin-film solar cell, which is widely used in various solar electronic instruments and other products, and belongs to the technical field of silicon thin-film solar cells. Background technique [0003] At present, silicon thin-film batteries mainly use amorphous silicon materials. According to different application requirements, solar cells can be made into various shapes. For example, Chinese patent 200610061259.2 "Heterogeneous silicon thin-film solar cells" discloses that the shape and the effective working surface of the battery are complex and diverse. Special-shaped solar cells can also be made into transparent windows of various shapes by drilling holes or laser scribing in the cell surface. However, the patent 200610061259.2 uses a traditional laser as the light source of the laser marking machine, resulting in the laser marking line diameter of the front electrode layer, silicon film layer, and back ele...

AI Technical Summary

Problems solved by technology

However, the patent 200610061259.2 uses a traditional laser as the light source of the laser marking machine, resulting in the laser marking line diameter of the front electrode layer, silicon film layer, and back electrode layer being too large, and the diameter of each laser marking line reaches 0.1 ~0.4mm, according to the structure of the inline silicon thin film solar cell, after the front electrode layer, the silicon thin film layer and the back electrode layer are stacked and connected in series, the width of the invalid area between the battery cells inside the battery can be calculated as: three laser lines The sum of the scribed line diameters is 0.3-1.2mm plus the spacing between the three laser lines and 0.2-0.6mm, that is, the width of the invalid area reaches 0.5-1.8mm, which reduces the effective capacity of the battery to a certain extent. Power generation area, thereby reducing the power generation power of the battery, that is, reducing the photoelectric conversion efficiency of the solar cell

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