Abstract:
A method for manufacturing a multi-layer semiconductor structure is disclosed. First, a first wafer comprising a first semiconductor device structure and a second wafer comprising a substrate and a single crystal silicon layer are provided, and the first and second wafers are combined in which a surface of the first wafer having the first semiconductor device structure is in contact with a surface of the second wafer having the single crystal silicon layer. A glue layer and a dielectric layer can be employed to combine the first and second wafers. Afterwards, a process for manufacturing a second semiconductor device structure is performed on the single crystal silicon layer.
Abstract:
A metal etching process is described. A substrate having a dielectric layer thereon is provided. An aluminum-copper alloy layer is formed on the dielectric layer. A hard mask layer is formed on the aluminum-copper alloy layer. A patterned photoresist layer is formed on the hard mask layer and then the hard mask layer is patterned. A thermal treatment process is performed. The thermal treatment process is carried out at a temperature of more than 300° C. for a period of at least 3 minutes. Thereafter, the aluminum-copper alloy layer is etched using the patterned hard mask layer as an etching mask. Due to the thermal treatment, the metal precipitate (CuAl2) within the aluminum-copper alloy layer is eliminated and hence the metal etching process is improved.
Abstract:
A writing method for a phase change memory is disclosed. The writing method inputs a first writing pulse signal to a phase change memory to heat the phase change memory to above a first temperature and inputting a second writing pulse signal to the phase change memory to keep the phase change memory at a second temperature.
Abstract:
A method for forming a gate structure with a pulled-back conductive layer and the use of the method are provided. The method conducts a local, not global, pull-back process on the conductive layer of the gate structure at the position intended for contact window formation, wherein the pull-back process is conducted after rapid thermal oxidation to prevent CBCB short, CB open and/or CBGC short.
Abstract:
An integration system for obtaining a set of overlay offset parameters of a first process layer which is going to be formed in an assigned photolithography tool with an assigned mask and an assigned pre-tool. By using the integration system, the set of overlay offset parameters of the first process layer can be precisely predicted based on summing the historic-recorded set of overlay offset parameters and the bias values including a mask bias value, a photolithography tool bias value and a pit-tool bias value. Therefore, the overlay offset parameters corresponding to the same process layer can be well integrated and managed. Hence, the cost and time due to performing the test run can be saved and the throughput can be increased as well.
Abstract:
The present gate structure comprises a gate oxide layer positioned on a substrate, a conductive stack positioned on the gate oxide layer, a passivation layer positioned on the sidewall of the conductive stack, and a cap layer positioned on the conductive stack. The conductive stack includes a polysilicon layer, a tungsten nitride layer, and a tungsten layer. The passivation layer can be made of silicon oxide, silicon nitride, or silicon oxynitride. The present method for preparing the gate structure comprises steps of forming a gate oxide layer, a conductive stack, and a cap layer on a semiconductor substrate in sequence, removing a portion of the gate oxide layer, the conductive stack, and the cap layer to form at least one opening, implanting silicon ions into the sidewall of the conductive stack, and performing a thermal treating process to transform the sidewall with silicon ions into a passivation layer.
Abstract:
A method for preparing a gate oxide layer first forms a mask layer including at least one opening on a semiconductor substrate, and forms a trench in the semiconductor substrate below the opening, wherein the trench surrounds an active area. The opening is enlarged to expose a portion of the semiconductor substrate at the sides of the trench, i.e., to expose the edge of the active area, and an implanting process is then performed to implant nitrogen-containing dopants into the exposed semiconductor substrate below the enlarged opening. Subsequently, the mask layer is removed to expose the semiconductor substrate in the active area, and a thermal treating process is performed to form a gate oxide layer on the upper surface of the semiconductor substrate in the active area. The nitrogen-containing dopants can inhibit the reaction rate of the thermal oxidation of the semiconductor substrate during the thermal treating process.
Abstract:
A method for preparing a trench capacitor structure first forms at least one trench in a substrate, and forms a capacitor structure in the bottom portion of the trench, wherein the capacitor structure includes a buried bottom electrode positioned on a lower outer surface of the trench, a first dielectric layer covering an inner surface of the bottom electrode and a top electrode positioned on the surface of the dielectric layer. Subsequently, a collar insulation layer is formed on the surface of the first dielectric layer above the top electrode, and a first conductive block is then formed in the collar insulation layer. A second conductive block with dopants is formed on the first conductive block, and a thermal treating process is performed to diffuse the dopants from the second conductive block into an upper portion of the semiconductor substrate to form a buried conductive region.
Abstract:
The present invention discloses a method for preparing a structure with high aspect ratio, which can be a trench or a conductor. A first mask is formed on a substrate, and a first etching process is performed to remove the substrate uncovered by the first mask to form at least one concavity. A second mask is formed on the surface of the prepared structure, a second etching process is then performed to remove the second mask on the concavity, and a third etching process is performed subsequently to extend the depth of the concavity into the substrate. To prepare a conductor with high aspect ratio in the substrate, the first mask and the second mask are preferably made of dielectric material or metal. In addition, to prepare a trench with high aspect ratio in a silicon substrate, the first mask and the second mask are preferably made of dielectric material.
Abstract:
A method for fabricating a first electrode of a capacitor is described. A substrate comprising an insulating layer formed thereon is provided. The insulating layer has an opening. A silicon layer is formed on the insulating layer. The silicon layer is transformed to a hemispherical grain layer. An etching process is performed to remove a portion of the hemispherical grain layer outside the opening.