Abstract:
A self-aligned conductive spacer process for fabricating sidewall control gates on both sides of a floating gate for high-speed RAM applications, which can well define dimensions and profiles of the sidewall control gates. A conductive layer is formed on the dielectric layer to cover a floating gate patterned on a semiconductor substrate. Oxide spacer are formed on the conductive layer adjacent to the sidewalls of the floating gate. Performing an anisotropic etch process on the conductive layer and using the oxide spacers as a hard mask, a conductive spacers are self-aligned fabricated at both sides of the floating gate, serving as sidewall control gates.
Abstract:
A self-aligned conductive spacer process for fabricating sidewall control gates on both sides of a floating gate for high-speed RAM applications, which can well define dimensions and profiles of the sidewall control gates. A conductive layer is formed on the dielectric layer to cover a floating gate patterned on a semiconductor substrate. Oxide spacer are formed on the conductive layer adjacent to the sidewalls of the floating gate. Performing an anisotropic etch process on the conductive layer and using the oxide spacers as a hard mask, a conductive spacers are self-aligned fabricated at both sides of the floating gate, serving as sidewall control gates.
Abstract:
A method of forming an integrated circuit structure includes providing a semiconductor substrate including a top surface; forming a first insulation region and a second insulation region in the semiconductor substrate; and recessing the first insulation region and the second insulation region. Top surfaces of remaining portions of the first insulation region and the second insulation region are flat surfaces or divot surfaces. A portion of the semiconductor substrate between and adjoining removed portions of the first insulation region and the second insulation region forms a fin.
Abstract:
An exemplary structure for the fin field effect transistor comprises a substrate comprising a major surface; a plurality of fin structures protruding from the major surface of the substrate, wherein each fin structure comprises an upper portion and a lower portion separated at a transition location at where the sidewall of the fin structure is at an angle of 85 degrees to the major surface of the substrate, wherein the upper portion has sidewalls that are substantially perpendicular to the major surface of the substrate and a top surface having a first width, wherein the lower portion has tapered sidewalls on opposite sides of the upper portion and a base having a second width larger than the first width; and a plurality of isolation structures between the fin structures, wherein each isolation structure extends from the major surface of the substrate to a point above the transition location.
Abstract:
A semiconductor device and method of fabricating thereof is described that includes a substrate having a fin with a top surface and a first and second lateral sidewall. A hard mask layer may be formed on the top surface of the fin (e.g., providing a dual-gate device). A gate dielectric layer and work function metal layer are formed on the first and second lateral sidewalls of the fin. A silicide layer is formed on the work function metal layer on the first and the second lateral sidewalls of the fin. The silicide layer may be a fully-silicided layer and may provide a stress to the channel region of the device disposed in the fin.
Abstract:
In a method for forming FinFETs, a photo resist is formed to cover a first semiconductor fin in a wafer, wherein a second semiconductor fin adjacent to the first semiconductor fin is not covered by the photo resist. An edge of the photo resist between and parallel to the first and the second semiconductor fins is closer to the first semiconductor fin than to the second semiconductor fin. A tilt implantation is performed to form a lightly-doped source/drain region in the second semiconductor fin, wherein the first tilt implantation is tilted from the second semiconductor fin toward the first semiconductor fin.
Abstract:
An exemplary structure for a field effect transistor (FET) comprises a silicon substrate comprising a first surface; a channel portion over the first surface, wherein the channel portion has a second surface at a first height above the first surface, and a length parallel to first surface; and two source/drain (S/D) regions on the first surface and surrounding the channel portion along the length of the channel portion, wherein the two S/D regions comprise SiGe, Ge, Si, SiC, GeSn, SiGeSn, SiSn, or III-V material.
Abstract:
In a method for forming FinFETs, a photo resist is formed to cover a first semiconductor fin in a wafer, wherein a second semiconductor fin adjacent to the first semiconductor fin is not covered by the photo resist. An edge of the photo resist between and parallel to the first and the second semiconductor fins is closer to the first semiconductor fin than to the second semiconductor fin. A tilt implantation is performed to form a lightly-doped source/drain region in the second semiconductor fin, wherein the first tilt implantation is tilted from the second semiconductor fin toward the first semiconductor fin.
Abstract:
A semiconductor device and method for fabricating a semiconductor device is disclosed. An exemplary semiconductor device includes a substrate and a 3D structure disposed over the substrate. The semiconductor device further includes a dielectric layer disposed over the 3D structure, a WFMG layer disposed over the dielectric layer, and a gate structure disposed over the WFMG layer. The gate structure traverses the 3D structure and separates a source region and a drain region of the 3D structure. The source and drain region define a channel region therebetween. The gate structure induces a stress in the channel region.
Abstract:
A method of forming an integrated circuit structure includes providing a semiconductor substrate; providing a first lithography mask, a second lithography mask, and a third lithography mask; forming a first mask layer over the semiconductor substrate, wherein a pattern of the first mask layer is defined using the first lithography mask; performing a first etch to the semiconductor substrate to define an active region using the first mask layer; forming a second mask layer having a plurality of mask strips over the semiconductor substrate and over the active region; forming a third mask layer over the second mask layer, wherein a middle portion of the plurality of mask strips is exposed through an opening in the third mask layer, and end portions of the plurality of mask strips are covered by the third mask layer; and performing a second etch to the semiconductor substrate through the opening.