Patent ID: 8508016

Claim:
A method for manufacturing a bipolar punch-through semiconductor device with a semiconductor substrate, having at least a two-layer structure with layers of a first and a second conductivity type, a first main side, and a second main side, wherein one of the layers in the two-layer structure is a base layer of the first conductivity type, wherein the first main side is arranged opposite of the second main side, wherein a first electrical contact is arranged on the first main side, wherein a second electrical contact is arranged on the second main side, wherein a buffer layer of the first conductivity type is arranged on the base layer on the second main side, which buffer layer has a higher doping concentration than the base layer, wherein a first layer is arranged in the substrate between the buffer layer and the second electrical contact, the first layer having alternating regions including at least one first region of the first conductivity type and at least one second region of the second conductivity type, the manufacturing method comprising: applying particles of the first conductivity type on the second main side to create the at least one first region; applying particles of the second conductivity type on the second main side to create the at least one second region; and activating the particles of the second conductivity type at such conditions that the particles diffuse into the substrate by not more than 2 μm and that the doping profile of the second region drops from 90% to 10% of the maximum doping concentration, to a distance within at most 1 μm, wherein at least one of the steps of the application of particles for the creation of the first region or the second region is performed through a mask.