摘要:
A method of forming high contrast alignment marks on an integrated circuit wafer for patterning a layer of highly reflective electrode metal is described. A method of patterning a layer of highly reflective metal on an integrated circuit wafer using high contrast alignment marks is also described. Due to a difference in height of alignment marks and contact metal surrounding the alignment marks the alignment marks are transferred to the contour of the highly reflective electrode metal. A non reflective layer of bottom anti-reflection coating material is then used to provide high contrast at the location where the edges of the alignment marks are transferred to the highly reflective electrode metal.
摘要:
A new method of local oxidation using an oxynitrided pad oxide layer to suppress the growth of a bird's beak is described. An oxide layer is provided over the surface of a semiconductor substrate. The oxide layer is annealed in a nitrogen atmosphere whereby the oxide layer is nitrided. The nitrided oxide layer is then reoxidized. A silicon nitride layer is deposited overlying the oxide layer. Portions of the silicon nitride and oxide layers not covered by a mask pattern are etched through to provide an opening exposing the portion of the semiconductor substrate that will form the field oxidation. The silicon substrate within the opening is oxidized wherein the semiconductor substrate is transformed to silicon dioxide wherein the nitrided oxide layer suppresses the formation of the bird's beak whereby the field oxidation is formed with a small bird's beak. The remaining oxide and silicon nitride layers are removed completing the field oxidation of the integrated circuit.
摘要:
A new method is provided for the creation of a solder bump. Conventional methods are initially followed, creating a patterned layer of Under Bump Metal over the surface of a contact pad. A layer of photoresist is next deposited, this layer of photoresist is patterned and developed creating a resist mask having a T-shape opening aligned with the contact pad. This T-shaped opening is filled with a solder compound, creating a T-shaped layer of solder compound on the surface of the layer of UBM. The layer of photoresist is removed, exposing the Created T-shaped layer of solder compound, further exposing the layer of UBM. The layer of UBM is etched using the T-shaped layer of solder compound as a mask. Reflow of the solder compound results in creating a solder ball.
摘要:
Within a method for fabricating an microelectronic fabrication there is first provided a substrate employed within an optoelectronic microelectronic fabrication, where the substrate comprises an optoelectronic microelectronic device which is in electrical communication with a bond pad formed over the substrate. There is then processed, when fabricating the substrate to form the optoelectronic microelectronic fabrication, the substrate in the absence of optoelectronically transducable radiation, in order to attenuate corrosion of the bond pad. The method is particularly useful for forming a color filter sensor image array optoelectronic microelectronic fabrication comprising multiple photoresist based patterned colored filter layers.
摘要:
A method of forming a high polysilicon resistor over a dielectric layer, comprising the following steps. A polysilicon resistor over a semiconductor structure is provided. The polysilicon resistor has a doped polysilicon layer having a first voltage coefficient of resistance and grain boundaries having a first trapping density. A to a first level of DC current is provided for a predetermined duration through the doped polysilicon layer to stress the doped polysilicon layer to partially melt the doped polysilicon layer without causing breakdown of the doped polysilicon layer. The to a first level of DC current is removed to allow recrystallization of the melted doped polysilicon layer, whereby the recrystallized doped polysilicon layer has a second voltage coefficient of resistance less than the first voltage coefficient of resistance and grain boundaries having a second trapping density that is less than the first trapping density. This makes the Rs of the polysilicon to be stable and saturated.
摘要:
A field oxide region and method of forming a field oxide region using a LOCOS process and nitride spacers formed on the sidewalls of the field oxide regions. During the LOCOS process recesses are formed in the field oxide which result in poor step coverage during successive process steps. Nitride spacers are formed on the sidewalls of the field oxide covering the recesses. The spacers provide a smooth surface over the field oxide and improved step coverage during subsequent process steps.
摘要:
A process has been developed in which an aluminum based, interconnect structure overlies a tungsten plug structure, in a small diameter contact hole. The tungsten plug is formed via RIE removal of unwanted tungsten, from areas other then the contact hole using a halogen containing etchant, and using a RIE overetch cycle that creates an unwanted crevice in the center of the tungsten plug. A post RIE anneal, in a nitrogen ambient removes moisture from surrounding dielectric layers and also forms a protective, nitrogen containing tungsten layer, filling the crevice in the tungsten plug. The filling of the crevice allows a planar overlying aluminum based, interconnect structure to be obtained.
摘要:
This invention describes a new method for forming self-aligned silicide for application in MOSFET, and a new structure of MOSFET device featuring elevated source and drain, with the objectives of reducing silicide penetration into the source and drain junctions, of eliminating junction spikes, of obtaining smoother interface between the silicide and the silicon substrate, and of reducing the chance of bridging of the silicides on the gate and on the source and drain. The new structure is made by depositing an amorphous layer of silicon on a silicon substrate already patterned with field oxide, gate oxide, polysilicon gate, and silicon nitride spacer on the gate sidewalls. Novel oxide sidewall spacers are then created by first implanting nitrogen into the horizontal surface of the amorphous silicon layer and subsequently thermally oxidizing the part of the amorphous silicon on the vertical sidewalls that is not exposed to nitrogen implantation. A dopant implantation followed by an annealing at 600.degree. C. in nitrogen converts the deposited silicon layer into elevated source and drains. A refractory metal, such as titanium is then deposited over the substrate and, upon rapid thermal annealing, reacts with the elevated source and drain polysilicon to form silicide without consuming the substrate silicon, and without ill effect on the source/drain junctions in the single crystalline silicon. The chance of silicide bridging is greatly reduced due to the special geometry of the novel sidewall oxide spacers.
摘要:
A method of forming different width spacers for NMOS and PMOS in the fabrication of an integrated circuit is described. A semiconductor substrate is provided wherein NMOS and PMOS regions are separated by an isolation region. Gate electrodes are formed in the NMOS and PMOS regions. Lightly doped regions are implanted into the semiconductor substrate within the NMOS and PMOS regions. A spacer material layer is deposited over the gate electrodes in the NMOS and PMOS regions and etched away to leave spacers on the sidewalls of the gate electrodes. The NMOS region is covered with a photoresist mask. Heavily doped source and drain regions are implanted into the semiconductor substrate within the PMOS region. The photoresist mask is removed. After the PMOS implantation, a portion of the spacers is etched away to leave narrower spacers on the sidewalls of the gate electrodes. The PMOS region is covered with a photoresist mask. Heavily doped source and drain regions are implanted into the semiconductor substrate within the NMOS region. The photoresist mask is removed and the fabrication of the integrated circuit is completed.
摘要:
A method of forming a polycide-to-polysilicon capacitor simultaneously with a CMOS device with polycide gate is described. Field oxide regions, n-well and p-well regions, and gate oxide regions are formed in and on a silicon substrate. A first layer of polysilicon, having a suitable doping concentration, is formed on the surface of the substrate and the field oxide regions. A layer of silicide is formed over the layer of polysilicon. The layer of silicide is ion implanted in a vertical direction to produce the low voltage coefficient and high linearity. A layer of interpoly oxide is formed over the layer of silicide. The layer of interpoly oxide is densified. A second layer of polysilicon is formed on the surface of the interpoly oxide. The second layer of polysilicon is doped, and then patterned to form the top plate of the capacitor. The layer of interpoly oxide is removed, except in the area under the top plate of the capacitor, where it acts as a capacitor dielectric. The layer of silicide and the layer of polysilicon are patterned to form a polycide bottom plate of the capacitor and to form the polycide gate. The layer of silicide is annealed. The source and drain regions of the CMOS device are formed in the substrate in the regions between the polycide gate and the field oxide regions; and the remaining layers are formed to complete the integrated circuit.