Semiconductor device having heterojunction type MIS...

Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Heterojunction

Reexamination Certificate

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C257S020000, C257S213000

Reexamination Certificate

active

06984844

ABSTRACT:
A semiconductor device according to the invention includes: a semiconductor layer (10–15); a gate insulator (16) provided on the semiconductor layer; a gate electrode (17) provided on the gate insulator; a source region (20a) and a drain region (20b), which are of a first conductivity type and are provided in the semiconductor layer on both sides of the gate electrode in plan view; a cap layer (25), a channel region (24), and an under-channel region (23,22), which are of a second conductivity type and are provided in the semiconductor layer between the source region and the drain region in a descending order from an interface with the gate insulator; and a bias electrode member (Vbs) for applying a voltage to the under-channel region, wherein the channel region is formed of a first semiconductor, the cap layer and the under-channel region are formed of a second semiconductor and a third semiconductor, respectively, each of which has a larger band gap than the first semiconductor, the bias electrode member is capable of applying the voltage independently of the gate electrode.

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Takamiya M. et al., “High Drive-Current Electrically Induced Body Dynamic Threshold SOI MOSFET (EIB-DTMOS) with Large Body Effect and Low Threshold Voltage”, IEEE Transactions on Electron Devices, Aug., 2001. vol. 48, No. 8, pp. 1633 to 1640, full text.
Toshiro Hiramoto et al., “Low Power and Low Voltage MOSFETs with Variable Threshold Voltage Controlled by Back-Bias”, IEICE Trans. Electron., vol. E83-C, No. 2 Feb. 2000,pp. 161-169.
Tadahiro Kuroda et al., “A 0.9-V, 150-MHz, 10-mW, 4 mm2, 2-D Discrete Cosine Transform Core Processor with Variable Threshold-Voltage (VT) Scheme”, IEEE Journal of Solid-State Circuits, vol., 31, No. 11, Nov. 1996, pp. 1770-1779.

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