| 摘要 |
A p-n junction is formed at the interface of a low-concentration n-type impurity layer and a p-type diffusion region in the vicinity of the upper major surface of an n-type semiconductor substrate of a semiconductor device. A mask composed of an absorber is placed on the upper major surface of the semiconductor device, and electron beams are radiated. Thereafter, heat treatment is conducted. As a result, the peak of the crystal lattice defect densities is present in the vicinity of the upper major surface of the n-type semiconductor substrate, and the crystal lattice defect densities are decreasingly distributed toward the lower major surface. Thereby, a semiconductor device that can minimize the variation of the breakdown voltage characteristics of the p-n junction of the diode, and can control the optimum carrier lifetime can be obtained.
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