Abstract: We have discovered that, by depositing a tantalum layer upon a substrate at a temperature of at least 325° C., it is possible to obtain an ultra low resistivity which is lower than that previously published in the literature. In addition, it is possible deposit a TaxNy film having an ultra low resistivity by depositing the TaxNy film upon a substrate at a temperature of at least 275° C., wherein x is 1 and y ranges from about 0.05 to about 0.18. These films having an ultra low resistivity are obtained at temperatures far below the previously published temperatures for obtaining higher resistivity films. A combination of elevated substrate temperature and ion bombardment of the film surface during deposition enables the use of lower substrate temperatures while maintaining optimum film properties.
Abstract: An ion beam sputtering system having a chamber, an ion beam source, multiple targets, a shutter, and a substrate stage for securely holding a wafer substrate during the ion beam sputtered deposition process in the chamber. The substrate stage is made to tilt about its vertical axis such that the flux from the targets hit the wafer substrate at a non-normal angle resulting in improved physical, electrical and magnetic properties as well as the thickness uniformity of the thin films deposited on the substrate in the ion beam sputtering system.
Type:
Grant
Filed:
July 10, 2000
Date of Patent:
May 29, 2001
Assignee:
International Business Machines Corporation
Abstract: Thin films of Ti-Cr-Al-O are used as a resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O2. Resistivity values from 104 to 1010 Ohm-cm have been measured for Ti-Cr-Al-O film <1 &mgr;m thick. The film resistivity can be discretely selected through control of the target composition and the deposition parameters. The application of Ti-Cr-Al-O as a thin film resistor has been found to be thermodynamically stable, unlike other metal-oxide films. The Ti-Cr-Al-O film can be used as a vertical or lateral resistor, for example, as a layer beneath a field emission cathode in a flat panel display; or used to control surface emissivity, for example, as a coating on an insulating material such as vertical wall supports in flat panel displays.
Type:
Grant
Filed:
January 3, 2000
Date of Patent:
April 17, 2001
Assignee:
The Regents of the University of California
Abstract: A structure and method of making resistive emitting members which exhibit high resistivity while at the same time providing high temperature operation significantly above that known in the art. Specifically the use of nitrides of Group IVB transition metals from the periodic table, exclusive of titanium is described.
Type:
Grant
Filed:
June 29, 1998
Date of Patent:
April 3, 2001
Assignee:
Honeywell International Inc.
Inventors:
Barrett E. Cole, James O. Holmen, David K. Greenlaw
Abstract: A thin-film microstructure sensor includes a substrate having an insulation layer. A thin-film platinum temperature-sensitive resistor is provided on the insulation layer of the substrate, the thin-film platinum temperature-sensitive resistor comprising a platinum layer, the platinum layer having a maximum crystal grain size above a reference grain size of 800 Å. The thin-film platinum temperature-sensitive resistor is formed by a sputtering process to provide a temperature coefficient of resistance TCR above a reference TCR level of 3200 ppm.
Abstract: A process for increasing the sheet resistance and lowering the temperature coefficient of resistance of a thin film resistor deposited on a wafer, the process comprising ramping the temperature of the wafer to an annealing temperature above the decomposition temperature of the thin film resistor using a radiant heat source such that the wafer reaches the annealing temperature within a ramp up time of from about 5 to 10 seconds, and annealing the wafer at the annealing temperature for an annealing period of from about 50 to 85 seconds.