Patent ID: 6909142

Claim:
A semiconductor device comprising: an N-type semiconductor substrate; a transistor having a first impurity introduced region of P-type formed in a main surface of said semiconductor substrate and constituting a main junction together with said semiconductor substrate; and a channel stop structure formed in a peripheral portion of said semiconductor substrate, said channel stop structure including, a first conductive film; a second conductive film formed on said main surface of said semiconductor substrate and on said first conductive film, said second conductive film including a material different from that of said first conductive film and extending toward said main junction; a first trench formed in said main surface of said semiconductor substrate; and a second impurity introduced region of N-type formed in said main surface of said semiconductor substrate in a portion where said first trench is formed and directly contacting said first trench, wherein said first trench is filled with said first conductive film, and a portion of said first conductive film is formed on said main surface of said semiconductor substrate, said portion of said first conductive film extending toward said main junction.