Patent ID: 11688799

Abstract:
Provided is an IGBT device. The IGBT device includes an MOSFET cell array, where each MOSFET cell includes a p-type body region located at the top of an n-type drift region, an n-type emitter region located in the p-type body region, and a gate dielectric layer, a gate electrode and an n-type floating gate which are located above the p-type body region. The gate electrode is located above the gate dielectric layer, the n-type floating gate is located above the gate dielectric layer, and the gate electrode acts on the n-type floating gate through capacitive coupling. The n-type floating gate of at least one MOSFET cell is isolated from the p-type body region through the gate dielectric layer, and the n-type floating gate of at least one MOSFET cell contacts the p-type body region through an opening in the gate dielectric layer to form a p-n junction diode.