Semiconductor device including a ferroelectric film and control method thereof
First Claim
1. A semiconductor device with a memory cell, said memory cell comprising:
- a first semiconductor region of a first conductivity type forming a channel region;
second semiconductor regions of a second conductivity type forming a pair of source/drain regions formed at both ends of said first semiconductor region;
a gate dielectric film formed on one main surface of said first semiconductor region and having a ferroelectric film;
a gate electrode formed on said ferroelectric film; and
a back electrode formed on another main surface of said first semiconductor region at a position corresponding to said gate electrode with an insulating film interposed therebetween.
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Accused Products
Abstract
A non-volatile semiconductor device can be obtained which is capable of enhancing integration level and performing accurate control of operations. A memory cell transistor of the semiconductor device in accordance with the present invention has a gate dielectric film including a ferroelectric film between a gate electrode and a semiconductor region. A back electrode is formed at the semiconductor region in a position corresponding to the gate electrode. A channel is formed at a channel formation region of the semiconductor region by applying a voltage to the back electrode, and the ferroelectric film is polarized as desired by the difference in potential between the channel and the gate electrode. Information can thus be written into the memory cell.
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Citations
10 Claims
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1. A semiconductor device with a memory cell, said memory cell comprising:
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a first semiconductor region of a first conductivity type forming a channel region; second semiconductor regions of a second conductivity type forming a pair of source/drain regions formed at both ends of said first semiconductor region; a gate dielectric film formed on one main surface of said first semiconductor region and having a ferroelectric film; a gate electrode formed on said ferroelectric film; and a back electrode formed on another main surface of said first semiconductor region at a position corresponding to said gate electrode with an insulating film interposed therebetween. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor device comprising:
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a plurality of memory cells arranged in row and column directions each including; a first semiconductor region of a first conductivity type forming a channel region; second semiconductor regions of a second conductivity type forming a pair of source/drain regions formed at both ends of said first semiconductor region; a gate dielectric film formed on one main surface of said first semiconductor region and having a ferroelectric film; a gate electrode formed on said ferroelectric film; and a back electrode formed on another main surface of said first semiconductor region at a position corresponding to said gate electrode with an insulating film interposed therebetween.
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7. A method of controlling a semiconductor device, comprising the steps of:
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forming an inversion layer, at a first semiconductor region of a first conductivity type constituting a channel region which has one main surface and another main surface, by applying a prescribed voltage to a back electrode formed under said another main surface of said first semiconductor region with an insulating film interposed therebetween; applying a prescribed voltage to second semiconductor regions of second conductivity type constituting source/drain regions formed in contact with both ends of said first semiconductor region, and setting a potential of the inversion layer equal to that of the source/drain regions; and applying a voltage of an arbitrary value to a gate electrode formed on said one main surface of said first semiconductor region with a gate dielectric film having a ferroelectric film interposed therebetween, and polarizing the ferroelectric film in the gate dielectric film by a difference in potential between the gate electrode and the inversion layer. - View Dependent Claims (8, 9, 10)
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Specification