Why choose wafer cutting for 10W UV laser cutting machine?

Most semiconductor materials of ultraviolet laser cutting machine have good absorption of light in the ultraviolet band. Take the absorption of monocrystalline silicon in different wavelength bands as an example. When the semiconductor material is processed by laser in the ultraviolet band, due to the narrow focus spot of ultraviolet light, The photon energy is relatively high and can break the chemical bond of the material. The volume of the space occupied by the product expands rapidly, and finally shoots and separates the parent body in the form of a bulk explosion and takes away the excess energy. The hot zone has little effect. In this process, since there is no heat generated, the process of ultraviolet laser is also called "cold working". After the cutting is completed, each chip is separated by the corresponding split process. In this way, the machine can be used effectively, and at the same time, it can be convenient for us to find the fault in the maintenance of the problem, and facilitate the maintenance.

355nm UV laser cutting machine

Because the energy of this special wavelength and frequency laser acting on the material to be processed is only a few watts or even milliwatts, there is no molten material on the outside or inside, and the front and back sides are almost invisible with the eyes. , This provides a larger space for chip manufacturers to reduce the width of the cutting channel and increase the number of chips per unit area to reduce costs. Since the short-wavelength ultraviolet laser has almost no thermal damage, the material does not need to be cooled, and the entire cutting process is performed in a completely dry environment. The molten material is also vaporized, so the appearance of the material is not contaminated at all, which also solves the problem of contamination of semiconductor wafers.

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The application of UV lasers is becoming more and more popular

At present, with the gradual maturity and stability of ultraviolet lasers, the laser processing industry has shifted from infrared lasers to ultraviolet lasers. At the same time, the application of ultraviolet lasers is becoming more and more popular, and laser applications are moving towards a broader field. The working principle of the UV laser cutting machine is UV laser wafer cutting. The surface of the sapphire substrate is hard. Generally, the cutter wheel is difficult to cut, and the wear is large, the yield is low, and the cutting path is larger than 30 μm, which not only reduces the use area, And it reduces the output of the product. Driven by the blue and white LED industry, the demand for sapphire substrate wafer cutting has increased greatly, and higher requirements have been put forward for improving productivity and finished product qualification rate.

Application of UV laser in the field of semiconductor chip processing

In fact, the application of ultraviolet laser in the field of semiconductor chip processing mainly includes: chip cutting, wafer micro-hole drilling, wafer marking, laser adjustment of thin film resistance, laser measurement, laser etching, deep ultraviolet projection lithography, etc. In these applications, in order to adapt to the continuous development of large-scale production, from the perspective of output and cost, traditional die separation technology is no longer practical, and ultraviolet laser cutting technology will become an application with great potential. The key technology of the application. It also makes us more convinced of the success of this technology.