摘要:
A sputtering apparatus for coating a substrate comprising a first electrode for supporting a target material and a second electrode for supporting a substrate, upon which the coating is deposited. A source of RF power is connected to impose an RF voltage across the electrodes to produce a glow discharge in the space between the electrodes, and shutter means is provided in the space between the electrodes. The shutter means has means for blocking a substantial part of the sputtered atoms from the target electrode glow discharge traveling at or near normal incidence and at least one opening shaped to permit a substantial part of the sputtered atoms from the target electrode traveling at an oblique angle to impinge upon the substrate to produce a thin film coating of the target material.
摘要:
Disclosed is a process for forming an improved bipolar transistor in a silicon substrate (10) of a first conductivity type (N), said silicon substrate (10) having a planar surface, a subcollector region (11) of a second conductivity type formed in said substrate, an epitaxial layer (12) of said second conductivity type formed on said planar surface of said substrate (10), and first, second and third spaced apart recessed oxide isolation regions extending from the planar surface of said epitaxial layer into said substrate (10), a subcollector reach-through region (25) positioned between said second and third recessed oxide isolation regions, said subcollector reach-through region (25) extending from said planar surface of said epitaxial layer to said subcollector region, said process including the following steps: deposit, using chemical vapor deposition techniques, a layer of doped polysilicon on the exposed surface of said substrate (10) said dopant being of said first conductivity type; deposit, using chemical vapor deposition techniques a first layer of silicon dioxide (27) on said polysilicon layer (26): deposit a layer of photoresist on said first layer of silicon dioxide; utilizing photolithography, mask off an intended intrinsic base region (32), said intended intrinsic base region (32) being spaced between said first and second recessed oxide isolation regions (37); utilizing the resist layer as a mask (23) employ reactive ion etching to remove the silicon dioxide and polysilicon superimposed over the intended intrinsic base region (32); ion implant the exposed intrinsic base region with ions of said first conductivity type; chemically vapor deposit a relatively thick silicon dioxide conformal coating on the exposed surface; reactive ion etch an emitter opening on the epitaxial surface above the implanted intrinsic base (32); ion implant the emitter region with ions of said second conductivity type; and utilize a single heat cycle to anneal the ion implantations and drive in the emitter, intrinsic base, extrinsic base and collector reach through.
摘要:
An improved bipolar transistor structure formed in a very small area of a thin epitaxial layer (12) on a planar surface of a silicon substrate (10) of first conductivity type, said very small area of the thin epitaxial layer (12) having vertical isolating sidewalls (22) extending to the planar surface of said substrate, said area of thin epitaxial layer (12) containing in the order recited a shallow depth emitter region (43) of a second conductivity type having an exposed planar surface, a shallow depth base region (47) of said first conductivity type, and a shallow depth active collector region of said second conductivity type, an elongated region (37) of said first conductivity type surrounding said emitter (43), base (47) and active collector regions, said elongated region (37) being contained within and coextensive with said vertical isolating sidewalls (22) of said small area of said thin epitaxial layer (12), whereby the base collector capacitance is materially reduced due to the very small area of the base-collector junction.
摘要:
Bei einem Verfahren zum Herstellen von bipolaren Transistoren durch Ionenimplantation wird insbesondere die Basiszone (32) in eine auf ein Halbleitersubstrat (10) mit Subkollektor (14) epitaktisch aufgewachsene, die Kollektorzone bildende Halbleiterschicht (18) durch eine endgültig auf der Halbleiterschicht verbleibende, eine gleichmäßige Dicke aufweisende Siliciumdioxidschicht (20) hindurch implantiert. Anschließend werden Fenster (37, 36, 35) für den Emitterkontakt, den Basiskontakt und den Kollektorkontakt in der Siliciumdioxidschicht (20) geöffnet. Die Emitterzone (42) wird dann selektiv durch das Fenster (37) für den Emitterkontakt implantiert. Abschließend wird die die Kontakte und Verbindungsleitungen bildende Metallisierung auf die Siliciumdioxidschicht (20) aufgebracht. Dieses Verfahren gewährleistet trotz direkter Implantation der Emitterzone eine gleichmäßige Dicke der die abschließende Metallisierung tragenden Isolierschicht, was zu gleichmäßigen und abschätzbaren Kapazitäten führt.
摘要:
A shielded magnetoresistive (MR) sensor in which the first shield (12) is of sendust or super sendust and the second shield is of permalloy is made by the steps of depositing a layer of sendust or super sendust to form a first shield; heat treating the sendust layer at a temperature greater than 400°C; depositing a first electrically insulating layer (18) ; depositing, in the presence of a magnetic field, a MR layer (20) ; depositing a second layer (26) of electrically insulating material; and, depositing a layer (28) of permalloy to form the second shield.
摘要:
A method of forming a wide deep dielectric filled isolation trench in the surface of a silicon semiconductor substrate by forming a wide plug of chemical vapor deposited silicon dioxide in the trench, filling the remaining unfilled trench portions by chemical vapor depositing a layer of silicon dioxide over the substrate and etching back this layer. The method produces chemically pure, planar wide deep dielectric filled isolation trenches and may also be used to simultaneously produce narrow deep dielectric filled isolation trenches.
摘要:
A method of forming a wide deep dielectric filled isolation trench in the surface of a silicon semiconductor substrate by forming a wide plug of chemical vapor deposited silicon dioxide in the trench, filling the remaining unfilled trench portions by chemical vapor depositing a layer of silicon dioxide over the substrate and etching back this layer. The method produces chemically pure, planar wide deep dielectric filled isolation trenches and may also be used to simultaneously produce narrow deep dielectric filled isolation trenches.