Patent ID: 6784455
Filing Date: 2004-08-31
Classification: H01L

Abstract:
A first thin-film transistor (TFT) comprising source/drain and channel regions of a single grain of crystallized first film material formed from doping an amorphous first film with a transition metal through a transition metal window at a first concentration, first density of nucleation sites, and a first distance between nucleation step, annealing said amorphous first film to form a first area of crystallized first film which is a single grain of crystal, the doping occurring, at least partially, simultaneously with the annealing of said first film, the doping of said first film being controlled by depositing an insulator film having a first thickness over said amorphous first film, with said transition metal being deposited overlying said insulator film, and in which said transition metal diffuses through said insulator film into said amorphous first film first during annealing, whereby said transition metal is continually introduced during the annealing process to support the lateral growth of crystallization, and etching a pattern in said first area of crystallized first film to form the source/drain resigns, whereby a transistor is formed having high electron mobility and low leakage current in the transistor active areas.