Abstract:
A high dielectric constant insulator including a thin film of a metal oxide selected from the group consisting of tungsten-bronze-type oxides, pyrochlore-type oxides, and combinations of Bi2O3 with an oxide selected from the group consisting of perovskites and pyrochlore-type oxides. An embodiment contains metal oxides represented by the general stoichiometric formulae AB2O6, A2B2O7 and A2Bi2B2O10, wherein A represents A-site atoms selected from the group of metals consisting of Ba, Bi, Sr, Pb, Ca, K, Na and La; and B represents B-site atoms selected from the group of metals consisting of Ti, Zr, Ta, Hf, Mo, W and Nb. Preferably, the metal oxides are (BaxSr1-x)(TayNb1-y)2O6,where 0 /=40, and preferably about 100. The value of Vcc in the metal oxides of the invention is close to zero. The value of Tcc is
Abstract:
A vapor-phase deposition system includes one or more channel units for promoting the downstream passage of reagent gases. A reactor (21) of a vapor-phase deposition system may include one or more channels (25) to promote passage of reagent gases (5) beneath a susceptor stage (33). A susceptor, for arrangement within a reactor during epitaxial growth on a substrate, may include a truncated side (35). The substrate may be aligned with a lower edge of the truncated side, thereby, avoiding chemical deposition on surfaces upstream of the substrate. One or more channels of the susceptor promote the downstream passage of reagent gases within the reactor. Methods for vapor-phase deposition and for promoting downstream passage of reagent gases within a reactor are also disclosed.
Abstract:
A precursor liquid (64) comprising silicon in a xylene solvent is prepared, a substrate (5, 71) is placed within a vacuum deposition chamber (2), the precursor liquid is misted, and the mist (66) is flowed into the deposition chamber while maintaining the chamber at ambient temperature to deposit a layer of the precursor liquid on the substrate. The liquid is dried, baked, and annealed to form a thin film (1224, 77) of silicon dioxide or silicon glass on the substrate. Then an integrated circuit (100) is completed to include at least a portion of the silicon dioxide or silicon glass layer as an insulator (77) for an electronic device (76) in the integrated circuit.
Abstract:
An integrated circuit capacitor (10, 25, 30, 402) containing a thin film of dielectric metaloxide (20, 420) is formed above a silicon germanium substrate (12, 406). A silicon nitride diffusion barrier layer (24, 324, 414) is deposited on a silicon germanium substrate to prevent evaporation of the substrate in subsequent heating steps. A silicon dioxide stress reduction layer is deposited on the diffusion barrier layer. A bottom electrode (16, 418) is formed on the stress reduction layer, then a liquid precursor is spun on the bottom electrode, dried at about 400 DEG C, and annealed at between 600 DEG C and 850 DEG C to form a BST capacitor dielectric (20, 420). A top electrode (22, 422) is deposited on the dielectric and annealed. The integrated circuit may also include a BiCMOS device, a HBT device or a MOSFET.
Abstract:
A coating of liquid precursor for forming a layered superlattice material is applied to a substrate, the substrate is dried and then pretreated using RTP at 450 DEG C for 5 minutes. Following the RTP, the substrate is annealed in an unreactive gas at a temperature not exceeding 800 DEG C, then annealed in oxygen gas at a temperature not exceeding 800 DEG C for one hour to form a thin film (124, 422) of layered superlattice material.
Abstract:
A thin film of ferroelectric layered superlattice material in a flat panel display device is energized to selectively influence the display image. In one embodiment, a voltage pulse causes the layered superlattice material to emit electrons that impinge upon a phosphor, causing the phosphor to emit light. In another embodiment, an electric potential creates a remanent polarization in the layered superlattice material, which exerts an electric field in liquid crystal layer, thereby influencing the transmissivity of light through the liquid crystal. The layered superlattice material is a metal oxide formed using an inventive liquid precursor containing an alkoxycarbolyxate. The thin film thickness is preferably in the range of 50-140 nm, so that polarizability and transparency of the thin film is enhanced. A display element may comprise a varistor device to prevent cross-talk between pixels and to enable sudden polarization switching. A functional gradient in the ferroelectric thin film enhances electron emission. Two ferroelectric elements, one on either side of the phosphor may be used to enhance luminescence. A phosphor can be sandwiched between a dielectric and a ferroelectric layer to enhance emission.
Abstract:
A resin molded type semiconductor device has: a semiconductor chip (12) which is mounted on a die pad portion (11) of a lead frame (9); thin metal wires (14) which connect terminals of the semiconductor chip (12) to inner lead portions (13) of the lead frame (9); and a sealing resin (15), and the lead frame (9) is subjected to an upsetting process so that a supporting portion (11) is located at a position higher than the inner lead portions (13). Since the sealing resin of a thickness corresponding to the step difference of the upsetting exists below the supporting portion, the adhesiveness between the lead frame and the sealing resin can be improved, and high reliability and thinning are realized. Since at least one groove portion is disposed in the surface of each of the inner lead portions (13), the anchoring effect to the sealing resin (15), stress acting on a lead portion of a product, and stress to the thin metal wires (14) can be relaxed, and leads and the thin metal wires can be prevented from peeling off.
Abstract:
On a main surface of a p-type silicon substrate having a bipolar transistor forming region and a MOS transistor forming region, an epitaxial layer is grown and n-type buried layers are formed. After forming a trench penetrating the buried layer, a buried polysilicon layer is formed in the trench. Then, a threshold control layer, a punch-through stopper layer, a channel stopper layer, an n-type well layer and a p-type well layer of each MOSFET are formed. At this point, since the well layer is formed through high energy ion implantation, the n-type buried layer is suppressed from being enlarged, and hence, time required for forming the trench can be shortened. Thus, a practical method of manufacturing a semiconductor device is provided.
Abstract:
A first thin insulating film capable of being pierced or punched through by carriers such as an SiO2 film 20 A thick is deposited on the surface of a P-type silicon substrate and a second insulating film with a trap level such as an Si3N4 film 500 to 600 A thick is laid on the first insulating film. Upon application of an electric field through a metal electrode mounted on the second insulating film to the combination of the insulating films, electrons captured at the trap level of the second insulating film transfer through the first insulating film to the surface of the substrate thereby forming an inversion layer. When the inversion layer is connected with the two junction regions formed in the surface of the substrate, the reverse current level of the junction region increases semipermanently due to the breakdown voltage of the junction until the inversion layer is cancelled by the application of a reverse electric field. This principle is used to produce a memory device characterized by an exact operation comprising a semiconductor, the first thin insulating film, the second insulating film with a trap level, the second insulating film, the metal electrode and two PN junctions which have different junction breakdown voltages.
Abstract:
An apparatus for producing fluorescent lamps comprises an intermittently rotatable turret having a plurality of glass tube supporting arms extending radially from the turret. The apparatus is so arranged that a plurality of glass tubes supported from the supporting arms are simultaneously subjected to working operations such as heating, bending, evacuation, filling, sealing etc. at a plurality of stations in each of which a plurality of glass tubes are subjected to the same working operation to improve the productivity of the apparatus.