摘要:
A method and apparatus for testing and characterizing features formed on a substrate. In one embodiment, a test structure is provided that includes a test element having a first side and an opposing second side. A first set of one or more structures defining a first region having a first local density are disposed adjacent the first side of the test element. A second set of one or more structures defining a second region having a second local density are disposed adjacent the second side of the test element. A third set of one or more structures defining a third region having a first global density are disposed adjacent the first region. A fourth set of one or more structures defining a fourth region having a second global density are disposed adjacent the second region.
摘要:
A method is provided, the method including forming a gate dielectric above a surface of the substrate and forming a doped-poly gate structure above the gate dielectric, the doped-poly gate structure having an edge region. The method also includes forming a dopant-depleted-poly region in the cage region of the doped-poly gate structure adjacent the gate dielectric.
摘要:
A method and apparatus for testing and characterizing features formed on a substrate. In one embodiment, a test structure is provided that includes a test element having a first side and an opposing second side. A first set of one or more structures defining a first region having a first local density are disposed adjacent the first side of the test element. A second set of one or more structures defining a second region having a second local density are disposed adjacent the second side of the test element. A third set of one or more structures defining a third region having a first global density are disposed adjacent the first region. A fourth set of one or more structures defining a fourth region having a second global density are disposed adjacent the second region.
摘要:
A method is provided, the method including forming a gate dielectric above a substrate layer, and forming a gate conductor above the gate dielectric. The method also includes forming at least one dielectric isolation structure in the substrate adjacent the gate dielectric.
摘要:
A method for enhancing the thickness of a field oxide layer at perimeters of the field regions is presented. The use of a relatively thin pad oxide layer under a nitride layer reduces lateral encroachment of the field oxide layer into device active areas, but also results in undesirable elevational disparities in an upper surface of the field oxide layer near perimeters. Elevational disparities are created when the field oxide layer grows up and around vertical edges of remaining portions of the patterned nitride layer. An oxide deposition step followed by a directional etch process are used to fill in the elevational disparities, increasing the thickness of the field oxide layer at perimeters of the field regions. In a first embodiment, an oxide layer is deposited over the exposed surface following removal of remaining portions of the nitride layer over device active areas. In a second and third embodiment, oxide layer deposition and etch follow removal of substantially all of the remaining portions of the pad oxide layer and an upper portion of the field oxide layer as to expose the silicon substrate in device active areas. In the third embodiment, a sacrificial oxide layer is grown in and on device active areas prior to oxide layer deposition and etch.
摘要:
A method of making MOS integrated circuits employs high-pressure oxidation of the surface of a silicon slice to create thermal field oxide for device isolation. The implant used prior to this oxidation to provide the channel-stop regions beneath the field oxide may be at a lower dosage, and yet the field-transistor threshold voltage is maintained at a high level. Thus, encroachment of the channel stop impurity into the transistor channel is minimized, and higher density devices are permitted.