Abstract:
A trench step channel cell transistor and a manufacture method thereof are disclosed. The transistor could be applied to increase the channel length thereof. The transistor comprises a step silicon layer formed by a selective growth, while the step silicon layer is located above the active area of the transistor.
Abstract:
A method for fabricating a semiconductor device is described. A gate dielectric layer is formed on a substrate. A plurality of gate structures are formed on the gate dielectric layer. Each of the gate structures is composed of a stacked structure and a spacer. Each stacked structure includes a gate conductive layer and a cap layer. The spacer includes a first dielectric layer and a second dielectric layer. A barrier layer is formed over the substrate covering conformally the gate structures and the gate dielectric layer. A dielectric layer is formed on the barrier layer. A self-aligned contact window etching process is conducted to form a contact window opening. A SEG process is conducted to grow an epitaxial silicon layer to form a contact window and an air gap in the opening.
Abstract:
A deep trench capacitor disposed in a deep trench in a substrate is provided. The deep trench capacitor includes a bottom electrode disposed in the substrate surrounding a bottom of the deep trench; a first conductive layer disposed in the deep trench; a capacitor dielectric layer disposed between a lower surface of the deep trench and the first conductive layer; a second conductive layer disposed in the deep trench and above the first conductive layer; a collar oxide layer disposed between an upper surface of the deep trench and the second conductive layer; a third conductive layer disposed in the deep trench and above the second conductive layer; an isolation structure disposed in parts of the third conductive layer, the second conductive layer and the substrate; and an isolation layer disposed below the isolation structure and in parts of the second conductive layer and the substrate.
Abstract:
A method of fabrication deep trench capacitors includes forming a plurality of deep trenches in a substrate. A bottom electrode is formed in the substrate surrounding the bottom of each deep trench. A capacitor dielectric layer and a first conductive layer are formed at the bottom of each deep trench. A collar oxide layer is formed on the sidewall of the deep trench exposed by the first conductive layer. A second conductive layer fills each deep trench. An opening is formed in a region predetermined for an isolation structure between adjacent deep trenches, wherein the depth of the opening is greater than that of the isolation structure. An isolation layer is filled in the opening.
Abstract:
An apparatus for preparing an ultra-thin specimen with a polishing wheel is developed. The apparatus includes a base, a holding unit mounted on the base and having a movable part for supporting the specimen, and an adjusting assembly attached to the base for adjusting an orientation of the specimen relative to a top surface of the polishing wheel by providing a fine movement during polishing. The movable part of the holding unit is advantageously moved away from the adjusting assembly to enlarge the latitudinal cross-section of the apparatus so as to increase the precision of the orientation.