Squaring process and application of monocrystal silicon round bar for solar cells

Abstract

The invention discloses a squaring process of a monocrystal silicon round bar for solar cells. The squaring process comprises the steps that the circumferential radian between a ridge line of the silicon bar and a ridge line of an adjacent crystal support is adjusted to be 2pi / 9-5pi / 18, and then the monocrystal silicon round bar is squared. The invention further provides a production process of a monocrystal silicon solar cell. The production process comprises the steps of preparation of monocrystal silicon cutting pieces, surface texturing and printing of electrode grid lines. The monocrystal silicon cutting pieces are quasi square silicon slices formed by wire-electrode cutting of cutting pieces by a monocrystal silicon square bar, and the monocrystal silicon square bar is obtained by the monocrystal silicon round bar through the squaring process, and the printed electrode grid lines are parallel to or perpendicular to the edges of the quasi square silicon slices. According to the squaring process of the monocrystal silicon round bar, four monocrystal silicon square bars with the lateral crystal orientations being <110> + / -5 degrees can be obtained, then four monocrystal silicon cutting pieces with the edge crystal orientations being <110> + / - 5 degrees are obtained, the bottom edge of a texturing face pyramid structure formed by conventional texturing of the monocrystal silicon slices can be used for transmitting photoproduction electrons, and route extending of the photoproduction electrons can not happen on the bottom edge of the pyramid structure.

Description

technical field [0001] The invention relates to a squaring process for monocrystalline silicon round rods for solar cells, and a production process for monocrystalline silicon solar cells applying the squaring process. Background technique [0002] At present, monocrystalline silicon wafers for solar cells mainly use monocrystalline silicon round rods with <100> crystal orientation grown by the Czochralski method as raw materials. Align the ridgelines of the crystal holder on the crystal holder one by one, and then square the monocrystalline silicon round rod, cut the round rod into a quasi-square cylinder (single crystal silicon square rod) with four corners and arc-shaped cross-section, and then pass through The grinding wheel of the spheronizing machine is rounded, so that the square bar blank with uneven growth potential can be obtained in a uniform size, and the square bar can be used for wire cutting and slicing to obtain monocrystalline silicon wafers for the pr...

AI Technical Summary

Problems solved by technology

) This relative position makes the photo-generated electrons need a longer transmission distance to reach the grid line when they are transmitted on the surface of the silicon wafer, resulting in an extension of the transmission distance

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