3D stacked multilayer semiconductor memory using doped select transistor channel
First Claim
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1. 3D stacked multilayer semiconductor memory comprising:
- memory transistors constituted by heavily doped N-type semiconductor layers and lightly doped or undoped P-type semiconductor layers alternately layered with one another in a stacking direction, each layer extending in a longitudinal direction perpendicular to the stacking direction; and
select transistors constituted by lightly doped P-type semiconductor layers and heavily doped P-type semiconductor layers alternately layered with one another, said select transistors being provided with gate electrodes,wherein the lightly doped P-type semiconductor layers of the select transistors are connected, continuously in the longitudinal direction, to one ends of the heavily doped N-type semiconductor layers of the memory transistors, respectively, and the heavily doped P-type semiconductor layers of the select transistors are connected, continuously in the longitudinal direction, to one ends of the lightly doped or undoped P-type semiconductor layers of the memory transistors, respectively, andwherein the lightly doped P-type semiconductor layers of the select transistor function as channels to select one of the heavily doped N-type semiconductor layers when applying voltage to the gate electrodes, and the heavily doped P-type semiconductor layers of the select transistors function as isolators to isolate the heavily doped P-type semiconductor layers from the lightly doped or undoped P-type semiconductor layers of the memory transistors.
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Abstract
In 3D stacked multilayer semiconductor memories including NAND and NOR flash memories, a lightly boron-doped layer is formed on top of a heavily boron-doped layer to form a select transistor, wherein the former serves as a channel of the select transistor and the latter serves as an isolation region which isolates the select transistor from a memory transistor.
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13 Claims
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1. 3D stacked multilayer semiconductor memory comprising:
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memory transistors constituted by heavily doped N-type semiconductor layers and lightly doped or undoped P-type semiconductor layers alternately layered with one another in a stacking direction, each layer extending in a longitudinal direction perpendicular to the stacking direction; and select transistors constituted by lightly doped P-type semiconductor layers and heavily doped P-type semiconductor layers alternately layered with one another, said select transistors being provided with gate electrodes, wherein the lightly doped P-type semiconductor layers of the select transistors are connected, continuously in the longitudinal direction, to one ends of the heavily doped N-type semiconductor layers of the memory transistors, respectively, and the heavily doped P-type semiconductor layers of the select transistors are connected, continuously in the longitudinal direction, to one ends of the lightly doped or undoped P-type semiconductor layers of the memory transistors, respectively, and wherein the lightly doped P-type semiconductor layers of the select transistor function as channels to select one of the heavily doped N-type semiconductor layers when applying voltage to the gate electrodes, and the heavily doped P-type semiconductor layers of the select transistors function as isolators to isolate the heavily doped P-type semiconductor layers from the lightly doped or undoped P-type semiconductor layers of the memory transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification