Development of 600V-class trench filling SJ-MOSFET with SSRM analysis technology

600 V-class superjunction (SJ)-MOSFETs were developed using our original high-resolution Scanning Spread Resistance Microscopy (SSRM) analysis technology [1] for optimization of trench filling process for the first time. The SSRM analysis is a powerful tool for the SJ structure design, because it can be achieved the measurement of two- dimensional (2D)-carrier profile and detect of minute voids. The measured profile was applicable for device simulation of the SJ-Diode and the estimated breakdown voltage was in good agreement with the experimental values. By the feed back of these results to the trench filling process, the breakdown voltage was increased and the trade-off characteristics between the breakdown voltage and the specific on-resistance were achieved to 685 V/16.5 mOmegacm² in the fabricated SJ-MOSFET.