Browse Prior Art Database

Glassed Diode Aluminum Ohmic Contact

IP.com Disclosure Number: IPCOM000094358D
Original Publication Date: 1966-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Folsom, RM: AUTHOR

Abstract

This fabrication technique eliminates failures in a solid state circuitry layer that are due to discontinuities in the circuit layer at the edge of an ohmic contact.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Glassed Diode Aluminum Ohmic Contact

This fabrication technique eliminates failures in a solid state circuitry layer that are due to discontinuities in the circuit layer at the edge of an ohmic contact.

Ohmic contacts in semiconductor devices conventionally consist of a metal contact layer that makes contact with the semiconductor device through an aperture in an overlying insulating glass layer.

The ohmic contact normally has a peripheral portion overlying the glass adjacent the aperture. When the relatively thin circuit pattern is joined to the ohmic contact, a discontinuity can develop where the pattern passes over the stepped edge of the ohmic contact to the insulating glass layer. In this method, ohmic contact 10 is applied over insulating glass layer 12 and silicon dioxide layer 14 in electrical contact with the semiconductor element 8, as in A, in the conventional manner. Contact 10 is then lapped flush with the surface of layer 12 resulting in the modified contact 10a as in B. Circuit pattern 16 is then deposited in glass layer 12 in contact with ohmic contact 10 as in C.

An alternate technique to eliminate discontinuities in the circuit pattern is to feather the peripheral edges of the ohmic contact by lapping or buffing. The circuit pattern is subsequently applied. The circuit layer can be applied over the gradual contour produced by feathering without developing a discontinuity.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]