摘要:
A method of manufacturing a MOS transistor begins with the provision of a semiconductor substrate. A gate oxide layer, a polysilicon layer and a silicon nitride layer are sequentially formed over the substrate. Next, the gate oxide layer, the polysilicon layer and the silicon nitride layer are patterned to form a gate structure. Subsequently, spacers are formed covering the sidewalls of the gate oxide layer, the polysilicon layer and the silicon nitride layer. Thereafter, a dielectric layer is formed, and covers the semiconductor substrate, the silicon nitride layer and the spacers. Next, a planarization operation is carried out to remove a portion of the dielectric layer. Planarization continues until the silicon nitride layer is exposed. After that, the silicon nitride layer is removed, exposing the polysilicon layer, and then a glue layer is formed over the dielectric layer and the polysilicon layer. Finally, a conductive layer is formed over the glue layer to complete the fabrication of the MOS transistor.
摘要:
A method of reducing laser mark peeling depends on what sort of layer lies over the laser mark. If a structure formed on the laser mark is a conductive layer, an adhesion layer or a passivation layer, the conductive layer, adhesion layer or passivation layer is removed from the laser mark. If a structure formed on a laser mark is a dielectric layer, the dielectric layer is left on the laser mark. The area removed from the upper layer is equal to or bigger than the area removed from the lower layer in order to avoid contacts between the conductive layers. In addition to being used for a laser mark, the method mentioned above can be also used for a wafer edge and an alignment mark.
摘要:
A method for manufacturing shallow trench isolation regions according to the invention uses a first stop layer and a second stop layer as two polishing stop layers, or a polishing stop layer and an etching stop layer, respectively. By performing chemical mechanical polishing twice, or performing chemical mechanical polishing one time and then etch back, the influence on subsequently formed shallow trench isolation regions caused by different sizes and densities thereof can be greatly alleviated.
摘要:
An adjustable method for making trenches for a semiconductor IC device having eliminated top corners is disclosed. The adjustable method includes forming a masking layer on the surface of the silicon nitride layer covering the device substrate that has openings corresponding to the openings of the trenches formed. Dimension of the masking layer opening is relatively greater than the dimension of the opening of the corresponding trench. An anisotropic etching procedure is then performed against the portions of the device substrate exposed out of the coverage of the masking layer, and the anisotropic etching shapes the trench sidewalls into sloped ones having larger dimension at the opening than at the surface of the filling material inside the trenches. This eliminates the top corners at the edges of the trench opening, charge accumulation and consequent leakage current can thus be prevented.
摘要:
The present invention provides a memory array including a substrate, an isolation region, a plurality of active regions, a plurality of buried bit lines, a plurality of word lines, a plurality of drain regions and a plurality of capacitors. The isolation region and the active regions are disposed in the substrate and the active regions are encompassed and isolated by the isolation region. The buried bit lines are disposed in the substrate and extend in the second direction. The word lines are disposed in the substrate extend in the first direction. The drain regions are disposed in the active region not covered by the word lines. The capacitors are disposed on the substrate and electrically connected to the drain regions.
摘要:
A method for adjusting the trench depth of a substrate has the steps as follows. Forming a patterned covering layer on the substrate, wherein the patterned covering layer defines a wider spacing and a narrower spacing. Forming a wider buffering layer arranged in the wider spacing and a narrower buffering layer arranged in the narrower spacing. The thickness of the narrower buffering layer is thinner than the wider buffering layer. Implementing dry etching process to make the substrate corresponding to the wider and the narrower buffering layers form a plurality of trenches. When etching the wider and the narrower buffering layers, the narrower buffering layer is removed firstly, so that the substrate corresponding to the narrower buffering layer will be etched early than the substrate corresponding to the wider buffering layer.
摘要:
A memory structure having a floating body is provided, which includes a substrate including an active area and an isolation structure surrounding the active area, a first source/drain region in the substrate in the active area, a first floating body in the substrate above the first source/drain region, a second floating body on the first floating body, a second source/drain region on the second floating body, and a trench-type gate structure in the substrate and beside the first floating body. A method of fabricating a memory structure having a floating body is also provided.
摘要:
A memory cell with surrounding word line structures includes an active area; a plurality of first trenches formed on the active area in a first direction, each first trench has a bit line on a sidewall therein; a plurality of second trenches formed on the active area in a second direction, each second trench has two word lines formed correspondingly on the sidewalls in the second trench; and a plurality of transistors formed on the active area. The word line pairs are arranged into a surrounding word line structure. The transistor is controlled by the bit line and the two word lines, thus improving the speed of the transistor.
摘要:
A manufacturing method for double-side capacitor of stack DRAM has steps of: forming a sacrificial structure in the isolating trench and the capacitor trenches; forming a first covering layer and a second covering layer on the sacrificial structure; modifying a part of the second covering layer; removing the un-modified second covering layer and the first covering layer to expose the sacrificial structure; removing the exposed part of the sacrificial structure to expose the electrode layer; removing the exposed electrode layer to expose the oxide layer; and removing the oxide layer and sacrificial structure to form the double-side capacitors.
摘要:
A self-alignment method for a recess channel dynamic random access memory includes providing a substrate with a target layer, a barrier layer and a lining layer, wherein the target layer has shallow trench isolation structures; patternizing the lining layer, barrier layer and target layer to form recess trench channels; depositing a dielectric layer onto the recess trench channel; forming an ion doped region in the target layer; removing a portion of the dielectric layer to expose a portion of the recess trench channel; forming a filler layer covered onto the recess trench channel; removing a portion of the filler layer to expose a portion of the recess trench channel; forming a passivation layer onto the recess trench channel; removing the passivation layer on the lining layer; and removing the lining layer to form a plurality of structural monomers disposed at the recess trench channel and protruded from the target layer.