Field effect transistor device with contact in groove
First Claim
1. A semiconductor device assembly comprising:
- a semiconductor wafer having opposed front and rear surfaces, said wafer being a common substrate;
a plurality of substantially identical semiconductor devices formed on said wafer, each device including at least one via-hole extending into said wafer from said front surface toward said rear surface;
at least one circumferential separation groove extending into said wafer from said front surface toward said rear surface farther than said at least one via-hole and lying outwardly from a first of said semiconductor devices for separation of said first semiconductor device from said wafer;
a first metallic electrode disposed in said at least one via-hole for electrically connecting said respective semiconductor devices at said front surface; and
a metal layer disposed in said at least one separation groove for forming a metal protection layer on surfaces of said semiconductor devices when they are separated from said wafer.
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Accused Products
Abstract
A high power FET device includes a plated heat sink, a rear surface electrode disposed between a substrate and the heat sink, a via-hole extending through the substrate and containing a metal plating for electrically connecting the rear surface electrode and an element, such as the source electrode, of the FET device. A metallic layer extending from the rear surface to the front surface of the device protects the side walls of the substrate during handling. The side wall protection layer extends onto portions of the front surface of the substrate as a measurement electrode. The arrangement gives access to the source, drain, and gate electrodes of the device from the front surface for measuring the electrical characteristics of the device while it is still part of a wafer containing a large number of devices. Each device includes a separation groove outwardly spaced from the device and containing a metallic layer which becomes the side wall protection layer after dicing. Preferably, the separation grooves are wider and deeper than the via-holes.
32 Citations
9 Claims
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1. A semiconductor device assembly comprising:
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a semiconductor wafer having opposed front and rear surfaces, said wafer being a common substrate; a plurality of substantially identical semiconductor devices formed on said wafer, each device including at least one via-hole extending into said wafer from said front surface toward said rear surface; at least one circumferential separation groove extending into said wafer from said front surface toward said rear surface farther than said at least one via-hole and lying outwardly from a first of said semiconductor devices for separation of said first semiconductor device from said wafer; a first metallic electrode disposed in said at least one via-hole for electrically connecting said respective semiconductor devices at said front surface; and a metal layer disposed in said at least one separation groove for forming a metal protection layer on surfaces of said semiconductor devices when they are separated from said wafer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification