Process for cutting silicon wafer by using steel wire with diameter of 0.1mm

Abstract

The invention discloses a process for cutting a silicon wafer by using a steel wire with the diameter of 0.1mm. In the process, silicon carbide (SiC) and a cutting fluid are proportioned according to the mass ratio of 1:1 to 1:1.2; in a glue curing process, single crystals are pressurized for 0.5 to 3h by a 5 to 10kg heavy pressurizing punch to remove redundant glue; and the cutting is performed by using the steel wire with the diameter of 0.10mm under the pre-tension of 15 to 23N, a wire speed is 400 to 1,000m / min, the descending speed of a workbench is 0.3 to 1mm / min, and a cutting stroke is set according to the actual diameter of the single crystal. The process for cutting the silicon wafer by using the steel wire with the diameter of 0.1mm can effectively reduce cutting loss and improve the quality of a cut surface, achieves more remarkable benefits if the silicon wafer is thinner, and compared with the processes in which the steel wires with the diameters of 0.14mm and 0.12mm are adopted generally, saves raw materials by 6.45 percent and 2.15 percent respectively.

Description

technical field [0001] The invention relates to a process for slicing semiconductor silicon wafers, in particular to a process for cutting silicon wafers with a steel wire with a diameter of 0.1 mm. Background technique [0002] Solar cell power generation technology, with its environmental protection, inexhaustible supply, and wide range of applications, is being vigorously developed and widely used around the world. However, the current higher cost of solar cells is the biggest problem it is currently facing. [0003] Raw materials have always been the biggest cost in the processing of solar silicon wafers, reducing knife edge loss and thinning is the development direction of solar silicon wafer processing. [0004] Reducing the diameter of the cutting steel wire and the particle size of the cutting sand can reduce the loss of the slicing edge, but at the same time it will cause a decrease in the cutting ability and an increase in the wire breakage rate. When ...

AI Technical Summary

Problems solved by technology

[0004] Reducing the diameter of the cutting steel wire and the particle size of the cutting sand can reduce the loss of the slicing edge, but at the same time it will cause a decrease in cutting ability and an increase in the wire breakage rate. When changing the diameter of the steel wire, appropriate process adjustments are required

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