Patent ID: 6177712
Filing Date: 2001-01-23
Classification: H01L

Abstract:
A Schottky barrier diode comprising:a substrate including a first-conductivity-type low concentration layer and a first-conductivity-type high concentration layer; anda guard ring region comprising a second-conductivity-type diffusion layer having an impurity surface concentration of not greater than 5.times.10.sup.17 /cm.sup.3, formed in said first-conductivity-type low concentration layer;wherein said first-conductivity-type low concentration layer has a thickness large enough to prevent a depletion layer that appears in the low concentration layer upon application of a maximum reverse voltage from reaching said first-conductivity-type high concentration layer; andwherein said thickness of said first-conductivity-type low concentration layer is controlled to be not smaller than a value represented by:x+0.55.multidot.(.rho..multidot.V).sup.1/2where ""x"" is a thickness of said diffusion layer of said guard ring region, "".rho."" is a resistivity of said first-conductivity-type low concentration layer, and ""V"" is a maximum applied voltage.