Method for fabricating thin film transistor device
First Claim
1. A method for fabricating a thin film transistor device having a polycrystalline semiconductor thin film to form a channel region, and a gate electrode which intersects the channel region, comprising the steps of:
- forming a structure comprising an amorphous semiconductor thin film separated by a gate insulating layer from a gate electrode on an insulating substrate; and
irradiating the amorphous semiconductor thin film with an energy beam having a rectangular irradiation area to convert the amorphous semiconductor thin film into a polycrystalline semiconductor thin film while relatively moving said energy beam along a scan direction which is orthogonal to the gate electrode and is parallel to the channel region.
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Abstract
A method for crystallizing a portion of a semiconductor thin film while forming a semiconductor device comprises providing a transparent substrate supporting a metallic gate electrode and an amorphous semiconductor thin film which are separated from each other by a gate insulating film, heating the gate electrode by subjecting it to light rays, and applying a laser beam to the amorphous semiconductor thin film so that the portion of the semiconductor thin film adjacent the metallic gate electrode is heated by both the laser beam and the heat of the gate electrode to cause a crystallization of a portion of the amorphous thin film and then processing the remaining amorphous portions of the thin film to form the transistor structure.
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Citations
8 Claims
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1. A method for fabricating a thin film transistor device having a polycrystalline semiconductor thin film to form a channel region, and a gate electrode which intersects the channel region, comprising the steps of:
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forming a structure comprising an amorphous semiconductor thin film separated by a gate insulating layer from a gate electrode on an insulating substrate; and irradiating the amorphous semiconductor thin film with an energy beam having a rectangular irradiation area to convert the amorphous semiconductor thin film into a polycrystalline semiconductor thin film while relatively moving said energy beam along a scan direction which is orthogonal to the gate electrode and is parallel to the channel region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification