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Patent US7804144 - Low-temperature grown high quality ultra-thin CoTiO3 gate dielectrics - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA gate oxide and method of fabricating a gate oxide that produces a more reliable and thinner equivalent oxide thickness than conventional SiO2 gate oxides are provided. Gate oxides formed from alloys such as cobalt-titanium are thermodynamically stable such that the gate oxides formed will have minimal...http://www.google.com/patents/US7804144?utm_source=gb-gplus-sharePatent US7804144 - Low-temperature grown high quality ultra-thin CoTiO3 gate dielectricsAdvanced Patent SearchPublication numberUS7804144 B2Publication typeGrantApplication numberUS 12/176,949Publication dateSep 28, 2010Filing dateJul 21, 2008Priority dateDec 20, 2001Also published asUS6953730, US7429515, US8178413, US20030119246, US20050158973, US20080283940, US20110014767Publication number12176949, 176949, US 7804144 B2, US 7804144B2, US-B2-7804144, US7804144 B2, US7804144B2InventorsKie Y. Ahn, Leonard ForbesOriginal AssigneeMicron Technology, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (102), Non-Patent Citations (221), Referenced by (1), Classifications (32) External Links: USPTO, USPTO Assignment, EspacenetLow-temperature grown high quality ultra-thin CoTiO3 gate dielectricsUS 7804144 B2Abstract A gate oxide and method of fabricating a gate oxide that produces a more reliable and thinner equivalent oxide thickness than conventional SiO2 gate oxides are provided. Gate oxides formed from alloys such as cobalt-titanium are thermodynamically stable such that the gate oxides formed will have minimal reactions with a silicon substrate or other structures during any later high temperature processing stages. The process shown is performed at lower temperatures than the prior art, which inhibits unwanted species migration and unwanted reactions with the silicon substrate or other structures. Using a thermal evaporation technique to deposit the layer to be oxidized, the underlying substrate surface smoothness is preserved, thus providing improved and more consistent electrical properties in the resulting gate oxide.
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