Patent ID: 11869971
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 14:
15. A 2-bit storage device comprising:
a substrate;
a source region in the substrate;
a drain region in the substrate; and
a gate stack over the substrate that, relative to a first direction, extends from the source region to the drain region, the gate stack including:
a ferroelectric layer over the substrate; and
a gate region located above the ferroelectric layer; and

wherein:
first and second ends of the ferroelectric layer are proximal correspondingly to the source and drain regions;
the ferroelectric layer includes dipoles;
the dipoles of the ferroelectric layer are asymmetrically polarized relative to the first direction, a first set of dipoles at the first end of the ferroelectric layer having a first polarization, and a second set of dipoles at the second end of the ferroelectric layer having a second polarization, the second polarization being substantially opposite of the first polarization;
the first polarization of the first end of the ferroelectric layer represents a first bit of the 2-bit storage device, the first bit being configured to be read by application of a read voltage to the source region and a do-not-disturb voltage to the drain region; and
the second polarization of the second end of the ferroelectric layer represents a second bit of the 2-bit storage device, the second bit is configured to be read by application of the do-not-disturb voltage to the source region and the read voltage to the drain region.