Semiconductor device forming method

Details Semiconductor device forming method Semiconductor device forming method

1996-09-06

2000-10-31

Trinh, Michael

Semiconductor device manufacturing: process

Making field effect device having pair of active regions...

On insulating substrate or layer

438164, 438486, H01L 2184

Patent

active

06140165&

ABSTRACT:
In thin film transistors (TFTs) having an active layer of crystalline silicon adapted for mass production, a catalytic element is introduced into doped regions of an amorphous silicon film by ion implantation or other means. This film is crystallized at a temperature below the strain point of the glass substrate. Further, a gate insulating film and a gate electrode are formed. Impurities are introduced by a self-aligning process. Then, the laminate is annealed below the strain point of the substrate to activate the dopant impurities. On the other hand, Nickel or other element is also used as a catalytic element for promoting crystallization of an amorphous silicon film. First, this catalytic element is applied in contact with the surface of the amorphous silicon film. The film is heated at 450 to 650.degree. C. to create crystal nuclei. The film is further heated at a higher temperature to grow the crystal grains. In this way, a crystalline silicon film having improved crystallinity is formed.

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