Semiconductor device and manufacturing method thereof

Active solid-state devices (e.g. – transistors – solid-state diode – Non-single crystal – or recrystallized – semiconductor... – Field effect device in non-single crystal – or...

Reexamination Certificate

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C438S471000, C257SE27001

Reexamination Certificate

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07821008

ABSTRACT:
A catalytic element is added to an amorphous semiconductor film and heat treatment is conducted therefor to produce a crystalline semiconductor film with good quality, a TFT (semiconductor device) with a satisfactory characteristic is realized using the crystalline semiconductor film. A semiconductor layer includes a region containing an impurity element which has a concentration of 1×1019/cm3to 1×1021/cm3and belongs to group 15 of the periodic table and an impurity element which has a concentration of 1.5×1019/cm3to 3×1021/cm3and belongs to group 13 of the periodic table, and the region is a region to which a catalytic element left in the semiconductor film (particularly, the channel forming region) moves.

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