Semiconductor device having a thin film transistor

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device

Reexamination Certificate

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C257S052000, C257S057000, C257S059000, C257S288000

Reexamination Certificate

active

06847064

ABSTRACT:
A semiconductor device having a pair of impurity doped second semiconductor layers, formed on a first semiconductor layer having a channel formation region therein, an outer edge of the first semiconductor film being at least partly coextensive with an outer edge of the impurity doped second semiconductor layers. The semiconductor device further includes source and drain electrodes formed on the pair of impurity doped second semiconductor layers, wherein the pair of impurity doped second semiconductor layers extend beyond inner sides edges of the source and drain electrodes so that a stepped portion is formed from an upper surface of the source and drain electrodes to a surface of the first semiconductor film.

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Divisional Application based on 10/011,708, filed May 8, 2002, entitledMethod of Manufacturing a Semiconductor Device, Hongyong Zhang et al.

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