Patent ID: 6825522
Filing Date: 2004-11-30
Classification: H01L

Abstract:
A capacitor comprising:a first conducting electrode formed of a semiconductor material, said first conducting electrode comprising a bulk layer having a first surface and a plurality of bonding sites thereon and an interface layer having a chemical composition different from said bulk layer, said interface layer is chemically bonded to at least some of the bonding sites on the first surface and extends from the first surface of the bulk layer, said interface layer comprising a plurality of dopant atoms chemically bonded therein, wherein the concentration of the dopant atoms in the interface layer is greater than the concentration of the dopant atoms in the bulk layer so as to substantially confine a depletion region in the first electrode to the interface layer, wherein the depletion region is caused by removal of mobile charge carriers in response to an applied voltage; a second conducting electrode; and an insulating layer interposed between the first and second conducting electrodes such that the insulating layer is disposed adjacent the interface layer of the first conducting electrode.