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High-Frequency Semiconductor Construction

IP.com Disclosure Number: IPCOM000098203D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Sawyer, DE: AUTHOR

Abstract

Thin metal strips or ribbons offer a number of advantages when employed in making ohmic or rectifying contacts with semiconductor bodies. Such ribbons have a substantial surface area and are excellent conductors of high-frequency currents since the latter flow mainly in the skin of a conductor. Furthermore, conductive ribbons have less self-inductance than do round-wire leads.

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High-Frequency Semiconductor Construction

Thin metal strips or ribbons offer a number of advantages when employed in making ohmic or rectifying contacts with semiconductor bodies. Such ribbons have a substantial surface area and are excellent conductors of high-frequency currents since the latter flow mainly in the skin of a conductor. Furthermore, conductive ribbons have less self-inductance than do round-wire leads.

When an end of a ribbon abuts a semiconductor body, the region of engagement is a very thin rectangle which approaches a line contact if the end of the ribbon is sharpened. The ribbon may be alloyed to the semiconductor at its abutting end so as to create either an ohmic or a rectifying contact. This is accomplished to place all portions of the ohmic contact or the rectifying junction, as the case may be, as close as possible to the surface of the conductive ribbon. This, in turn, promotes the easy flow of high-frequency currents through the junction. Furthermore, it avoids abrupt discontinuities at the ohmic contact or the rectifying junction which might otherwise impair broad-band operation.

The drawings illustrate a representative construction in the form of a high frequency diode 10 having the advantages mentioned. It includes a body or wafer 11 of a semiconductor material such as N-type germanium that is bonded to a conductive stud 12 so as to be in ohmic contact with it. A ribbon 13 of a material such as molybdenum bearing a gold indium platin...