Patent ID: 8460994

Claim:
A manufacturing method for a bipolar semiconductor device, comprising the steps of: forming a first high-resistance layer of a first conductive type on one surface of a semiconductor substrate of the first conductive type; forming a base region of a second conductive type on the first high-resistance layer of the first conductive type; forming a second high-resistance layer of the first conductive type on the base region; forming a low-resistance layer of the first conductive type on the second high-resistance layer of the first conductive type; forming emitter regions by partially etching a portion of the low-resistance layer and the second high-resistance layer; forming a recombination-inhibiting semiconductor layer of the second conductive type in the vicinity of a surface of the second high-resistance layer that was exposed by the etching; forming a base contact region joined to the base region; joining a base electrode to the base contact region, emitter electrodes to the emitter regions, and a collector electrode to an opposite surface of the semiconductor substrate; and forming an upper-layer electrode above the base electrode and the emitter electrodes, wherein the recombination-inhibiting semiconductor layer is not joined to the base region, and the recombination-inhibiting semiconductor layer has an impurity concentration lower than an impurity concentration of the base region.