All-around MOSFET gate and methods of manufacture thereof
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Accused Products
Abstract
Metal oxide field effect transistor having a channel and a gate that surrounds the channel on four sides. Method of manufacture of the transistor includes processing the back of a silicon wafer to form a buried gate that is electrically connected to the gate of a conventional field effect transistor to form an all-around structure.
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Citations
20 Claims
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1-9. -9. (Cancelled).
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10. A semiconductor element produced by a manufacturing method, said manufacturing method comprising:
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oxidizing a wafer having a first surface so as to form an oxide on the first surface;
creating a void in the oxide to form a gate region;
partially filling the void with gate dielectric;
filling the remaining portion of the void with gate material;
bonding the first surface of the wafer to a substrate;
removing material from a surface of the wafer opposite the first surface to expose the separation plane;
processing the separation plane surface to create a field effect transistor having a gate; and
electrically connecting the gate of the field effect transistor to the gate material contained in the void. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An all-around gate metal oxide semiconductor field effect transistor comprising:
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substrate comprising insulating material;
buried gate region that overlays the substrate, said buried gate region comprising;
layer of buried gate material, the bottom surface of which contacts the substrate, and layer of gate dielectric material that overlays the buried gate material, channel comprising silicon layer that overlays the gate dielectric material, said channel further comprising doped source and drain regions;
oxidized silicon that surrounds the buried gate region and the channel;
gate that overlays the channel so as to surround the channel on at least three sides, said gate comprising conducting material electrically isolated from the channel by gate dielectric material; and
one or more connections that electrically connect the gate to the layer of buried gate material in the buried gate region.
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20. An all-around gate metal oxide semiconductor field effect transistor comprising:
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substrate comprising conducting material;
dielectric layer that overlays the substrate buried gate region that overlays the substrate, said buried gate region comprising;
layer of buried gate material, the bottom surface of which contacts the substrate, and layer of gate dielectric material that overlays the buried gate material, channel comprising silicon layer that overlays the gate dielectric material, said channel further comprising doped source and drain regions;
oxidized silicon that surrounds the buried gate region and the channel;
gate that overlays the channel so as to surround the channel on at least three sides, said gate comprising conducting material electrically isolated from the channel by gate dielectric material; and
one or more connections that electrically connect the gate to the layer of buried gate material in the buried gate region.
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Specification