Semiconductor thin flim forming method and semiconductor device
First Claim
1. A semiconductor device including an active semiconductor film formed on an insulating substrate, at least a channel region of the active semiconductor film having a quasi-monocrystal state, which is a crystal state containing only grain boundaries having inclination angles of not more than 90 to a current direction.
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Abstract
A polycrystal thin film forming method comprising the step of forming a semiconductor thin film on a substrate 14, and the step of flowing a heated gas to the semiconductor thin film while an energy beam 38 is being applied to the semiconductor thin film at a region to which the gas is being applied to thereby melt the semiconductor film, and crystallizing the semiconductor thin film in its solidification. The energy beam is applied while the high-temperature gas is being flowed, whereby the melted semiconductor thin film can have low solidification rate, whereby the polycrystal thin film can have large crystal grain diameters and can have good quality of little defects in crystal grains and little twins.
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Citations
9 Claims
- 1. A semiconductor device including an active semiconductor film formed on an insulating substrate, at least a channel region of the active semiconductor film having a quasi-monocrystal state, which is a crystal state containing only grain boundaries having inclination angles of not more than 90 to a current direction.
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2. A semiconductor device including an active semiconductor film formed on an insulating substrate,
at least a channel region of the active semiconductor film having a polycrystal state which is formed of circular large-diameter crystal grain, a radius L of the circular large-diameter crystal grain being larger than 250 nm, and the radius L being larger than W/4 when a width of the channel is represented by W.
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9. A semiconductor thin film including a width-reduced part, at least the width-reduced part having a quasi-monocrystal state, which is a crystal state including grain boundaries having an inclination angles of not more than 90 to a current direction.
Specification