Patent ID: 11791423

Abstract:
A semiconductor having a n-doped cathode layer, a p-doped anode layer, and a drift region, arranged between the cathode layer and the anode layer, with a dopant concentration of at most 8·1015 cm−3. The drift region has a lightly n-doped drift layer and a lightly p-doped drift layer, arranged between the n-doped drift layer and the anode layer, both drift layers each have a layer thickness of at least 5 μm. The cathode layer has a first section with a dopant concentration of at least 1·1017 cm−3 and a second section, arranged between the first section and the drift region, the second section has a layer thickness of at least 1 μm and a dopant concentration gradient that increases in the direction of the first section up to a dopant concentration maximum. The dopant concentration maximum is smaller or equal to the dopant concentration of the first section.