Schottky diode
First Claim
Patent Images
1. A Schottky diode, comprising:
- a semiconductor body having a top side;
a weakly-conductive doped well formed in said semiconductor body;
a metallic layer on said well for forming a Schottky junction with lateral edges, said lateral edges being at least one of longer than a straight edge, curved, ramified, and rimose;
said metallic layer being at least one layer selected from the group of thin layers consisting of;
a liner of a contact hole filling extending in a dielectric layer covering said top side, a metal silicide layer, and a liner on said metal silicide layer; and
a contact region being highly doped for a low-impedance contact connection and having a lateral boundary in said doped well and one of a lattice-shaped structure, a finger-shaped structure, a comb-shaped structure, an irregularly curved edge, a ramified edge, and a rimose edge.
1 Assignment
0 Petitions
Accused Products
Abstract
A Schottky diode has a Schottky junction formed by a thin metal layer and/or metal silicide layer at the top side of a doped well in a semiconductor body or substrate. In contrast to the fabrication of low-impedance contacts on CMOS wells, a metal, to be precise titanium in the preferred embodiment, is applied not to a highly doped contact region but to the lightly doped semiconductor material of the doped well, for example an HV well for the fabrication of high-voltage transistors.
-
Citations
7 Claims
-
1. A Schottky diode, comprising:
-
a semiconductor body having a top side;
a weakly-conductive doped well formed in said semiconductor body;
a metallic layer on said well for forming a Schottky junction with lateral edges, said lateral edges being at least one of longer than a straight edge, curved, ramified, and rimose;
said metallic layer being at least one layer selected from the group of thin layers consisting of;
a liner of a contact hole filling extending in a dielectric layer covering said top side, a metal silicide layer, and a liner on said metal silicide layer; and
a contact region being highly doped for a low-impedance contact connection and having a lateral boundary in said doped well and one of a lattice-shaped structure, a finger-shaped structure, a comb-shaped structure, an irregularly curved edge, a ramified edge, and a rimose edge. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A Schottky diode, comprising:
-
a semiconductor body having a top side;
a dielectric layer covering said top side and having a contact hole formed therein;
a contact hole filling disposed in said contact hole;
a weakly-conductively doped well formed in said semiconductor body;
a metallic layer on said well for forming a Schottky junction with lateral edges, said lateral edges being at least one of longer than a straight edge, curved, ramified, and rimose, said metallic layer being selected from the group of layers consisting of;
a liner of said contact hole filling, a metal silicide layer, and a liner on said metal silicide layer; and
a contact region being highly doped for a low-impedance contact connection and having a lateral boundary in said doped well and one of a lattice-shaped structure, a finger-shaped structure, a comb-like structure, an irregularly curved edge, a ramified edge, and a rimose edge.
-
Specification