Process for manufacturing thin film transistor on unannealed...

Semiconductor device manufacturing: process – Making field effect device having pair of active regions... – On insulating substrate or layer

Reexamination Certificate

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C438S151000, C438S166000

Reexamination Certificate

active

06861299

ABSTRACT:
Inexpensive, unannealed glass is used as a substrate. The surface of a polycrystalline silicon film doped with boron (B) or phosphorus (P) is oxidized with ozone at a processing temperature of 500° C. or below to form a silicon oxide film of 4 to 20 nm thick on the surface of polycrystalline silicon. On account of this treatment, the level density at the interface between the gate-insulating layer and the channel layer can be made lower, and a thin-film transistor having less variations of characteristics can be formed on the unannealed glass substrate.

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