Patent ID: 6690068
Filing Date: 2004-02-10
Classification: H01L

Abstract:
A thin film transistor comprising:a glass substrate; a crystalline semiconductor film over the glass substrate; and at least a channel forming region in the crystalline semiconductor film, wherein: an orientation ratio of a lattice plane {101} of the crystalline semiconductor film is not less than 20%, the lattice plane {101} having an angle of not greater than 10 degrees with respect to a surface of the crystalline semiconductor film, an orientation ratio of a lattice plane {001} of the crystalline semiconductor film is not more than 3%, the lattice plane {001} having an angle of not greater than 10 degrees with respect to a surface of the crystalline semiconductor film, an orientation ratio of a lattice plane {111} of the crystalline semiconductor film is not more than 5%, the lattice plane {111} having an angle of not greater than 10 degrees with respect to a surface of the crystalline semiconductor film, the lattice planes {101}, {001}and {111} are detected by an electron backscatter diffraction pattern method, the crystalline semiconductor film is formed by heating an amorphous semiconductor film comprising silicon added with a metal element, and the amorphous semiconductor film comprises germanium at a concentration not less than 0.1 atomic % but not greater than 10 atomic %.