Patent ID: 6225197
Filing Date: 2001-05-01
Classification: H01L

Abstract:
In forming thin-film transistors with high electron mobility, a method for crystallizing an amorphous silicon film on a glass substrate comprising the steps of:a) depositing a layer of the amorphous silicon film having a first thickness on the glass substrate;b) introducing a transition metal to the amorphous silicon film, the transition metal introduction being selected from the group consisting of electroless plating, selective vapor deposition, and ion implantation at a first dosage; andc) in a one-step rapid thermal anneal (RTA), converting, at least partially, the amorphous film into a polycrystalline film, the one-step RTA consisting of ramping the temperature up to a temperature generally in the range of 650 to 800 degrees C, and annealing for a time in the range of between 1 ns and 1,000 seconds, whereby the transition metal induces rapid crystallization of the amorphous film in a continuous, unidirectional, growth front.