Taiwan Semiconductor Manufacturing Comp. Ltd.

Cheng-Fu Hsu

Po-Tao Chu

Kun-Ming Huang

Sen-Fu Chen

Ching-Wen Cho

A thin film transistor device structure and a method for fabricating the thin film transistor device structure each comprise a thin film transistor device formed over a substrate. The thin film transistor device structure also comprises a passivation layer formed of a silicon rich silicon oxide material formed over the thin film transistor device. The passivation layer formed of the silicon rich silicon oxide material provides the thin film transistor device with enhanced performance.

Thin film transistor (TFT) device structure employing silicon rich silicon oxide passivation layer

A new method of removing impurities and moisture from the surface of a wafer and thereby preventing polysilicon residue is described. A dielectric layer is provided over the surface of a semiconductor substrate. A polysilicon layer is deposited overlying the dielectric layer. A hard mask layer is deposited overlying the polysilicon layer and patterned to form a hard mask. The wafer is cleaned whereby moisture and impurities form on the surfaces of the hard mask and the polysilicon layer. Thereafter, the wafer is heat treated whereby the moisture and impurities are removed. Thereafter, the polysilicon layer is etched away where it is not covered by the hard mask to complete formation of a polysilicon line on a wafer in the fabrication of an integrated circuit.

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Taichung, Taiwan

Cheng-Fu Hsu