Semiconductor device having reduced effective substrate resistivity and associated methods
First Claim
1. A semiconductor device comprising:
- a semiconductor substrate having opposing first and second surfaces, and having at least one recess extending from the second surface into interior portions;
at least one device active region formed in said semiconductor substrate adjacent the first surface thereof;
an electrical contact layer on the second surface of said semiconductor substrate; and
at least one resistivity-lowering body positioned in said at least one recess of said semiconductor substrate and connected to said electrical contact layer, said at least one resistivity-lowering body comprising a material different than said semiconductor substrate and having an electrical resistivity-lowering than an electrical resistivity of said semiconductor substrate tto thereby lower an effective electrical resistivity thereof.
10 Assignments
0 Petitions
Accused Products
Abstract
A semiconductor device includes at least one device active region formed in a first surface of a semiconductor substrate, an electrical contact layer on a second surface of the semiconductor substrate, and at least one resistivity-lowering body positioned in a corresponding recess in the substrate and connected to the electrical contact layer. The body preferably comprises a material having an electrical resistivity lower than an electrical resistivity of the semiconductor substrate to thereby lower an effective electrical resistivity of the substrate. The device active region may be an active region of a power control device, such as a MOSFET or IGBT, for example. The body may preferably comprise an electrical conductor such as copper, aluminum, silver, solder, or doped polysilicon. The at least one recess and associated resistivity-lowering body preferably defines a proportion of the semiconductor substrate area adjacent the device active region greater than about 0.4 percent, and may extend into the semiconductor substrate a distance greater than about 25 percent of a thickness of the substrate.
46 Citations
49 Claims
-
1. A semiconductor device comprising:
-
a semiconductor substrate having opposing first and second surfaces, and having at least one recess extending from the second surface into interior portions; at least one device active region formed in said semiconductor substrate adjacent the first surface thereof; an electrical contact layer on the second surface of said semiconductor substrate; and at least one resistivity-lowering body positioned in said at least one recess of said semiconductor substrate and connected to said electrical contact layer, said at least one resistivity-lowering body comprising a material different than said semiconductor substrate and having an electrical resistivity-lowering than an electrical resistivity of said semiconductor substrate tto thereby lower an effective electrical resistivity thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A semiconductor device comprising:
-
a semiconductor substrate having opposing first and second surfaces, and having at least one recess extending from the second surface into interior portions; at least one metal-oxide semiconductor field-effect transistor (MOSFET) active region formed in said semiconductor substrate adjacent the first surface thereof; a conduction terminal contact on the second surface of said semiconductor substrate; and at least one resistivity-lowering body positioned in said at least one recess of said semiconductor substrate and connected to said conduction terminal contact, said at least one resistivity-lowering body comprising a material different than said semiconductor substrate and having an electrical resistivity lower than an electrical resistivity of said semiconductor substrate. - View Dependent Claims (20, 21, 22, 23, 24, 25)
-
-
26. A semiconductor device comprising:
-
a semiconductor substrate having opposing first and second surfaces; at least one device active region formed in said semiconductor substrate adjacent the first surface thereof; an electrical contact layer on the second surface of said semiconductor substrate; and at least one resistivity-lowering body connected to said electrical contact layer and extending into interior portions of said semiconductor substrate, said at least one resistivity-lowering body comprising a material having an electrical resistivity lower than about 10-4 Ω
.cm;said at least one resistivity-lowering body defining a proportion of the semiconductor substrate area adjacent said at least one device active region greater than about 0.4 percent and extending into said semiconductor substrate a distance greater than about 25 percent of a thickness of said semiconductor substrate. - View Dependent Claims (27, 28, 29, 30, 31)
-
-
32. A semiconductor device comprising:
-
a semiconductor substrate having opposing first and second surfaces; at least one device active region formed in said semiconductor substrate adjacent the first surface thereof; an electrical contact layer on the second surface of said semiconductor substrate; and at least one electrically conductive metal body connected to said electrical contact layer and extending into interior portions of said semiconductor substrate, said at least one electrically conductive metal body comprising a material having an electrical resistivity lower than an electrical resistivity of said semiconductor substrate. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
-
-
40. A semiconductor device comprising:
-
a semiconductor substrate having opposing first and second surfaces, and having at least one recess extending from the second surface into interior portions; at least one device active region formed in said semiconductor substrate adjacent the first surface thereof; an electrical contact layer on the second surface of said semiconductor substrate; and at least one resistivity-lowering body positioned in said at least one recess of said semiconductor substrate and connected to said electrical contact layer, said at least one resistivity-lowering body comprising a material having an electrical resistivity lower than an electrical resistivity of said semiconductor substrate to thereby lower an effective electrical resistivity thereof. said at least one recess and associated resistivity-lowering body extending into said semiconductor substrate a distance greater than about 25 percent of a thickness of said semiconductor substrate. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49)
-
Specification