摘要:
The phase transformation temperature of a metal silicide layer formed overlying a silicon layer on a semiconductor wafer is lowered. First, a refractory metal is disposed proximate to the surface of the silicon layer, a precursory metal is deposited in a layer overlying the refractory metal, and the wafer is heated to a temperature sufficient to form the metal silicide from the precursory metal. The precursory metal may be a refractory metal, and is preferably titanium, tungsten, or cobalt. The concentration of the refractory metal at the surface of the silicon layer is preferably less than about 10.sup.17 atoms/cm.sup.3. The refractory metal may be Mo, Co, W, Ta, Nb, Ru, or Cr, and more preferably is Mo or Co. The heating step used to form the silicide is performed at a temperature less than about 700.degree. C., and more preferably between about 600.degree.-700.degree. C. Optionally, the wafer is annealed following the step of disposing the refractory metal and prior to the step of depositing the precursory metal layer. Preferably, this annealing step is performed at a wafer temperature of at least about 900.degree. C.
摘要:
A semiconductor device is provided that includes a first inverter having a first p-channel FinFET and a first n-channel FinFET each coupled to a first shared contact forming a first cell node and having a first common gate. A second inverter is included having a second p-channel FinFET and a second n-channel FINFET each coupled to a second shared contact forming a second cell node and having a second common gate aligned with the first shared contact of the first inverter forming a latch circuit. Additionally, a pair of FinFET passgates are included each having a drain contact respectively coupled the first and second cell nodes and a source contact connected to one of a complementary bit line. Finally, a word line is connected to a gate contact of each of the pair of FinFET passgates to provide a static random access memory cell.
摘要:
Methods of forming an electrically conductive path under a barrier oxide layer of a semiconductor-on-insulator (SOI) substrate and an integrated circuit including the path are disclosed. In one embodiment, the method includes forming an electrically conductive path below a barrier oxide layer of a semiconductor-on-insulator (SOI) substrate, the method comprising: forming a first barrier oxide layer on a semiconductor substrate; forming the electrically conductive path within the first barrier oxide layer; and forming a second barrier oxide layer on the first barrier oxide layer. The electrically conductive path allows reduction of SRAM area by forming a wiring path underneath the barrier oxide layer on the SOI substrate.
摘要:
Methods of forming an electrically conductive path under a barrier oxide layer of a semiconductor-on-insulator (SOI) substrate and an integrated circuit including the path are disclosed. In one embodiment, the method includes forming an electrically conductive path below a barrier oxide layer of a semiconductor-on-insulator (SOI) substrate, the method comprising: forming a first barrier oxide layer on a semiconductor substrate; forming the electrically conductive path within the first barrier oxide layer; and forming a second barrier oxide layer on the first barrier oxide layer. The electrically conductive path allows reduction of SRAM area by forming a wiring path underneath the barrier oxide layer on the SOI substrate.
摘要:
Methods for fabricating a heterojunction bipolar transistor having a raised extrinsic base is provided in which the base resistance is reduced by forming a silicide atop the raised extrinsic base that extends to the emitter region in a self-aligned manner. The silicide formation is incorporated into a BiCMOS process flow after the raised extrinsic base has been formed. The present invention also provides a heterojunction bipolar transistor having a raised extrinsic base and a silicide located atop the raised extrinsic base. The silicide atop the raised extrinsic base extends to the emitter in a self-aligned manner. The emitter is separated from the silicide by a spacer.
摘要:
A detector circuit and method for detecting a silicon well voltage or current to indicate an alpha particle or cosmic ray strike of the silicon well. One significant application for the detection circuit of the present invention is for the redundancy repair latches that are used in SRAMs. The redundancy repair latches are normally written once at power-up to record failed latch data and are not normally written again. If one of the latches changes states due to an SER (Soft Error Rate-such as a strike by an alpha particle or cosmic ray) event, the repair data in the redundancy latches of the SRAM would now be incorrectly mapped. The detector circuit and method monitors the latches for the occurrence of an SER event, and responsive thereto issues a reload of the repair data to the redundancy repair latches. A first embodiment of the detector circuit differentially detects the floating voltages of first and second silicon wells during periods of non-operation of the circuits fabricated in the first and second silicon wells. In a second embodiment, a detector circuit monitors the background voltage level of a single silicon well over first and second consecutive periods of time. A second application for the detection circuit is for traditional logic circuits.
摘要:
A structure which ensures against deterioration of an underlying silicide layer over which a refractory material layer is deposited by physical vapor deposition (PVD) or chemical vapor deposition (CVD) is realized by first providing a continuous polysilicon layer prior to the refractory material deposition. The continuous polysilicon layer, preferably no thicker than 50 Å, serves a sacrificial purpose and prevents damage to an underlying silicide layer by blocking interaction between any fluorine and the underlying silicide that is released when the refractory material is formed.
摘要:
In a first aspect, a cross-coupled inverter is provided that includes a first inverter circuit having a first NFET coupled to a first PFET and a second inverter circuit having a second NFET coupled to a second PFET. The second inverter circuit is cross-coupled with the first inverter circuit at a plurality of nodes. The body of at least one of the first NFET, the second NFET, the first PFET and the second PFET is coupled so as to form a feedback path that reduces discharging at one or more of the plurality of nodes in response to a soft error event at the cross-coupled inverter.
摘要:
A selectively silicided semiconductor structure and a method for fabricating same is disclosed herein. The semiconductor structure has suicide present on the polysilicon line between the N+ diffusion or N+ active area and the P+ diffusion or active area at the N+/P+ junction of the polysilicon line, and silicide is not present on the N+ active area and the P+ active area. The presence of this selective silicidation creates a beneficial low-resistance connection between the N+ region of the polysilicon line and the P+ region of the polysilicon line. The absence of silicidation on the N+ and P+ active areas, specifically on the PFET and NFET structures, prevents current leakage associated with the silicidation of devices.
摘要:
An FET device and method of making comprising a first dielectric layer; a substrate layer on the dielectric layer; a channel region of a first conductivity type formed in the substrate layer; a gate formed above the substrate layer over the channel region; FET diffusion regions of a second conductivity type formed in the substrate layer, the diffusion regions each having edges, the edges of the FET diffusion regions being separated by the channel region; and a body contact region of the first conductivity type extending continuously from the channel region. The first conductivity type material in the body contact region is thinner than the first conductivity type material in the channel region. The FET also includes a second dielectric layer formed on the body contact region.