Patent ID: 6025217
Filing Date: 2000-02-15
Classification: H01L

Abstract:
A method of forming thin-film semiconductor devices, comprising the steps of:preparing an insulating substrate;preparing an insulating layer on said substrate having a relatively low thermal conductivity and a thickness of more than 20 nm;forming an amorphous semiconductor thin film having a high thermal conductivity to a thickness of less than 35 nm on said insulating layer;patterning the amorphous semiconductor thin film into device regions of the thin-film semiconductor devices;introducing an impurity into the device regions by ion implantation to form source and drain regions for each device region;forming an anti-reflective film over the device regions;performing a laser annealing after the step of forming said anti-reflective film by non-uniformly irradiating said amorphous semiconductor thin film with a laser beam to simultaneously convert said amorphous semiconductor thin film into polycrystalline semiconductor thin film channel regions having uniform crystal grain diameters and activate the impurity introduced into the source and drain regions below a maximum processing temperature of the insulating substrate;removing the anti-reflective film;forming a gate-insulating film on each of the channel regions only; andforming gate electrodes on each of the gate-insulating films.