A crystalline silicon solar cell

Abstract

A crystalline silicon solar cell, comprising a cell body (1), as well as a front electrode (2) positioned at the front face of the cell body (1) and a rear electrode (3) positioned at the rear face of the cell body (1), the front electrode (2) comprising multiple secondary grid lines (10) extending in a first direction (Y) and arranged in rows at regular intervals, and said front electrode (2) also comprising a number M of fine grid lines (20) extending in a second direction (X) and arranged in rows at regular intervals, the width (D1) of said fine grid lines (20) being 0.10-0.25mm; a number N of welding contacts (30) are provided at intervals on each fine grid line (20), the welding contacts (30) being layered over the fine grid line (20), the shapes of the welding contacts (30) being two or more of square, circular and elliptical, the length (L1) of a side of a square, diameter (R) of a circle or length (L2) of the short axis of an ellipse being greater than the width (D1) of a fine grid line (20); the rear electrode (3) comprises a number N×M of electrode units (31), the electrode units (31) and welding contacts (30) corresponding one-to-one, and the length of each electrode unit (31) along the first direction (Y) and the second direction (X) being no shorter than the length of a welding contact (30) along the corresponding direction.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a crystalline silicon solar cell. Background technique [0002] A crystalline silicon solar cell is an electronic component that converts sunlight energy into electrical energy. The preparation of crystalline silicon solar cells generally goes through processes such as texturing, diffusion, coating, screen printing, and sintering. Texturing is divided into single crystal and polycrystalline texturing. Monocrystalline cells use alkali texturing to form pyramid textures on the surface of silicon wafers. Polycrystalline cells use acid etching to form pitted textures on the surface of silicon wafers. The suede surface on the silicon surface can increase the absorption of sunlight on the surface of the battery to achieve light trapping; the diffusion process is to form a P-N junction inside the silicon wafer through thermal diffusion, so that when there is light, a voltage can be...

AI Technical Summary

Problems solved by technology

During the welding process of the ultra-fine ribbon and the sub-grid, due to the small width of the sub-grid, the abnormality of the sub-grid is too low, etc., resulting in virtual welding or inability to weld, the power of the photovoltaic module is reduced.

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