Developing of laser cutting and simultaneous removing of heat affected layer method of silicon, sapphile and SiC

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Laser grooving was performed in this study, aiming for its application to semiconductor-die cutting. Analysis of grooves formed on silicon revealed that processing in liquid etchants is more effective for reducing the heat affected layer on the grooves than processing in air or pure water. Besides, using a high-repetition-rate and low-peak-power laser, lower groove width was achieved than a low-repetition-rate and high-peak-power laser; however, excess repetition-rate caused unintended etching around the grooves. Though, such unintended etching could be suppressed by circulating the liquid etchant. In addition to above facts about silicon, it is found that 4H-SiC can be removed effectively by processing in liquid containing strong oxidant.