摘要:
Various processes are provided for producing a p-channel and/or n-channel transistor. The present processes are thereby applicable to NMOS, PMOS or CMOS integrated circuits, any of which derive a benefit from having an asymmetrical LDD structure. The asymmetrical structure can be produced on a p-channel or n-channel transistor in various ways. According, the present process employs various techniques to form an asymmetrical transistor. The various techniques employ processing steps which vary depending upon the LDD result desired. First the LDD implant can be performed only in the drain-side of the channel, or in the drain-side as well as the source-side. Second, the gate conductor sidewall surface adjacent the drain can be made thicker than the sidewall surface adjacent the source. Thickening of the drain-side sidewall spacer can be achieved either by depositing oxide upon a nitride-bearing film, or by growing additional oxide upon an exposed silicon surface having the source-side sidewall protected from growth. Third, the drain-side can be enhanced relative to the source-side by using an LTA implant. There may be numerous other modifications and alternative processing steps, all of which are described herein. Regardless of the sequence chosen, a barrier implant may be employed to prevent deleterious ingress of p-type implant species into the channel region. The present fabrication sequence reduces source-side resistance to enhance drive current--a desirable outcome for high speed circuits.
摘要:
An IGFET with a gate electrode in a transistor trench adjacent to an isolation trench is disclosed. The trenches are formed in a semiconductor substrate. A gate insulator is on a bottom surface of the transistor trench, insulative spacers are adjacent to opposing sidewalls of the transistor trench, and the gate electrode is on the gate insulator and spacers and is electrically isolated from the substrate. Substantially all of the gate electrode is within the transistor trench. A source and drain in the substrate are beneath and adjacent to the bottom surface of the transistor trench. The isolation trench is filled with an insulator and provides device isolation for the IGFET. Advantageously, the trenches are formed simultaneously using a single etch step.
摘要:
A method, apparatus, and a system for determining a control thread based upon a process result are provided. At least one post-process parameter is received. The post parameter relates to a first workpiece upon which a plurality of processes have been performed by a plurality of processing tools. A combination of at least a portion of the plurality of processing tools is selected based upon the post-process parameter.
摘要:
The present invention provides a method and apparatus for multivariate fault identification and classification. The method includes accessing data indicative of a plurality of physical parameters associated with a plurality of processed semiconductor wafers and providing at least one summary report including information indicative of at least one univariate representation of the accessed data and at least one multivariate representation of the accessed data.
摘要:
An integrated circuit fabrication process is provided in which an elevated doped polysilicon structure may be formed. The elevated structure may serve as a junction area of a transistor formed entirely within and upon the elevated polysilicon. The elevated structure frees up space within the lower level substrate for additional transistors and/or lateral interconnect, a benefit of which is to promote higher packing density within the integrated circuit. A transistor is provided which includes a gate conductor spaced between a pair of junctions. A primary interlevel dielectric is deposited across the transistor. A polysilicon structure is formed within a select portion of the upper surface of the primary interlevel dielectric. The polysilicon structure is a spaced distance above and a lateral distance from the transistor. A dopant is implanted into the polysilicon structure. A secondary interlevel dielectric is deposited across the primary interlevel dielectric and the doped polysilicon structure. Select portions of the primary and secondary interlevel dielectrics are then removed to expose one of the junctions and a portion of the doped polysilicon structure arranged proximate this junction. An interconnect is formed contiguously between the junction and the polysilicon structure by depositing a conductive material within the removed portions.
摘要:
In an IGFET device having at least one source/drain region with a lightly-doped sub-region proximate a channel region, the source/drain regions are formed by first implanting ions with parameters to form lightly-doped source/drain regions. A high density plasma deposition provides at least one spacer having preselected characteristics. As a result of the spacer characteristics, an ion implantation with parameters to form normally-doped source/drain regions is shadowed by the spacer. A portion of the source/drain region shadowed by the spacer results in a lightly-doped source/drain sub-region proximate the channel region. According to a second embodiment of the invention, the ion implantation resulting in the lightly-doped source/drain regions is eliminated. Instead, the spacer(s) formed by the high density plasma deposition and subsequent etching process only partially shadows the ion implantation that would otherwise result in normal doping of the source/drain regions. The parameters of the spacer(s) resulting from the high density plasma deposition and subsequent etching process result in a lightly-doped source/drain sub-region proximate the channel region. The shadowing of the spacer decreases with distance from the gate structure and results in a normal doping level for the portion of the source/drain terminal not shadowed by the spacer.
摘要:
An integrated circuit fabrication process is provided in which an elevated doped polysilicon structure may be formed and isolated from another polysilicon structure lying in the same elevated plane. The elevated structure may serve as a junction area of a transistor formed entirely within and upon the elevated polysilicon. The elevated structure frees up space within the lower level substrate for additional transistors and/or lateral interconnect, a benefit of which is to promote higher packing density within the integrated circuit. A first transistor is provided which is disposed upon and within a silicon-based substrate. A primary interlevel dielectric is deposited across the transistor and the substrate. Polysilicon may then be deposited across the primary interlevel dielectric and doped using ion implantation. A second transistor may be formed upon and within a portion of the polysilicon layer. The second transistor has a pair of implant regions spaced from each other by a gate conductor and a pair of oxide spacers arranged on opposed sidewall surfaces of the gate conductor. Part of the polysilicon layer is removed such that polysilicon only extends under the gate conductor and terminates a pre-defined distance from each of the pair of oxide spacers. A pair of junctions remain for the second transistor that are defined between an etched lateral edge and an oxide spacer. A second interlevel dielectric may be deposited across the second transistor and exposed areas of the primary interlevel dielectric to isolate the transistor from other active devices.
摘要:
A process for forming a semiconductor device having an elevated active region is disclosed. The process includes forming a plurality of gate electrodes on the semiconductor substrate and disposing a thick oxide layer over the gate electrodes. A trench is formed in a thick oxide layer and is filled with a polysilicon material. The polysilicon material is subsequently doped in order to form an elevated active region above an active region of the substrate.
摘要:
A high density integrated circuit structure and method of making the same includes providing a first silicon substrate structure having semiconductor device formations in accordance with a first circuit implementation and metal interlevel lines disposed on a top surface thereof and a second silicon substrate structure having a second circuit implementation and metal interlevel lines disposed on a top surface thereof. The first substrate structure includes a planarized low-K dielectric disposed between the metal interlevel lines and a protective coating separating the metal interlevel lines from the low-K dielectric, the metal interlevel lines of the first silicon substrate structure have a melting temperature on the order of less than 500.degree. C. and the low-K dielectric having a dielectric K-value in the range of 2.0-3.8. The second substrate structure also includes a planarized low-K dielectric disposed between the metal interlevel lines and a protective coating separating the metal interlevel lines from the low-K dielectric, the metal interlevel lines having a melting temperature on the order of less than 500.degree. C. and the low-K dielectric having a dielectric K-value in the range of 2.0-3.8. Lastly, the first substrate structure is low temperature bonded to the second substrate structure at respective metal interlevel lines of the first and second substrate structures.
摘要:
A process is provided for producing active and passive devices on various levels of a semiconductor topography. As such, the present process can achieve device formation in three dimensions to enhance the overall density at which an integrated circuit is formed. The multi-level fabrication process not only adds the to the overall circuit density, but does so with emphasis placed on high performance interconnection between devices on separate levels. The interconnect configuration is made as short as possible between features within one transistor level to features within another transistor level. This interconnect scheme lowers resistivity by forming a gate conductor of an upper level transistor upon a gate conductor of lower level transistor. Alternatively, the gate conductors can be a single conductive entity. In order to abut the gate conductors together, or form a single gate conductor, the upper level transistor is inverted relative to the lower level transistor. In addition to the inverted, shared gate conductor, the multi-level transistor fabrication process incorporates formation of openings and filling of those openings to produce interconnect to junctions of the upper/lower transistors. Interconnecting the gate conductors of a pair of stacked transistors and connecting specific junctions of those transistors allows formation of a high density inverter circuit hereof.