Self-aligned manufacturing method of a thin film transistor for

Semiconductor device manufacturing: process – Making field effect device having pair of active regions... – On insulating substrate or layer

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438159, 438302, H01L 2100

Patent

active

059982462

ABSTRACT:
The present invention is related to a self-aligned manufacturing method of a thin film transistor for forming a single-crystal bottom-gate and an offset drain. The main object of the present invention is to disclose two manufacturing methods to attain the self-aligned manufacturing method of a thin film transistor for forming a single-crystal bottom-gate and an offset drain. In the first method, a photoresistor and a silicon nitride are used to form a dual stack as a mask, further a large-angle ion implant is used to form a thin film transistor with a single-crystal bottom-gate and an offset drain. In the second method, the source side is protected by a dual stack formed by a P+ polysilicon layer which may be discarded selectively and a silicon nitride and an insulation spacer of sidewall in order to selectively discard the silicon nitride on the drain side, thus the object of a thin film transistor with a single-crystal bottom-gate and an offset drain is obtained.

REFERENCES:
patent: 5355006 (1994-10-01), Iguchi

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