| http://www.w3.org/ns/prov#value | - It can be thus seen clearly that the present invention is based on a concept completely different from theconventional concept based on the relaxation of the electric field concentration.Also, the location of the large band gap can be shifted depending on the location of the region to add thereto the impurity such as carbon, nitrogen, and oxygen.Further, the present invention has a feature that th
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