Patent Number: 7,535,065

Title: Thin film transistor device utilizing transistors of differing material characteristics

Abstract: A first insulating film is formed. Then, a gate electrode of a low voltage drive thin film transistor and a mask film for covering a region constituting a channel of a high voltage drive thin film transistor are formed with a molybdenum film on the first insulating film. An impurity is implanted into a semiconductor film while using the gate electrode and the mask film as a mask, thereby forming a high density impurity region. Thereafter, the impurity is activated by performing a thermal process under a condition at 500.degree. C. and for 2 hours, for example. Subsequently, the mask film is removed and a second insulating film is formed. A gate electrode of the high voltage drive thin film transistor is formed with an aluminum alloy on the second insulating film.

Inventors: Hotta; Kazushige (Kawasaki, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: H01L 29/76 (20060101); H01L 29/94 (20060101); H01L 31/062 (20060101); H01L 31/113 (20060101); H01L 31/119 (20060101)

Expiration Date: 2021-05-19 0:00:00