Investigation of Dynamic Avalanche in the Termination Region for FWDs with High Reverse Recovery Capability

This study investigated the destruction of FWDs in the termination region during reverse recovery, with the aim of enabling the fabrication of FWDs with a high current density and high reverse recovery capability. An investigation carried out by device simulation clarified that a high hole current in the termination region during reverse recovery leads to a dynamic avalanche, which may result in the destruction of the FWD. This study also demonstrated that FWDs fabricated using two concepts based on this understanding have a high current density and high reverse recovery capability without sacrificing basic characteristics.