摘要:
A heterojunction bipolar transistor is fabricated by stacking a Si collector layer, a SiGeC base layer and a Si emitter layer in this order. By making the amount of a lattice strain in the SiGeC base layer on the Si collector layer 1.0% or less, the band gap can be narrower than the band gap of the conventional practical SiGe (the Ge content is about 10%), and good crystalline can be maintained after a heat treatment. As a result, a narrow band gap base with no practical inconvenience can be realized.
摘要:
A heterojunction bipolar transistor comprises Si collector layer (3b), a SiGeC base layer (8a) and a Si emitter layer (9) stacked in this order. By making the amount of a lattice strain in the SiGeC base layer on the Si collector layer 1.0% or less, the band gap of the SiGeC base layer can be narrower than the band gap of the conventional SiGe base layer having a Ge content of about 10%, and good crystal quality can be maintained after a heat treatment.
摘要:
A MISFET having extremely high mobility comprising a first silicon layer (Si layer)(12), a silicon layer containing carbon (Si 1-y C y layer)(13) and an optional, second silicon layer (Si layer)(14) stacked in this order on a silicon substrate (10). The carbon content and thickness of the Si 1-y C y layer acting as a channel layer of the MISFET are such that said Si 1-y C y layer is under tensile strain whereby the conduction and valence bands thereof are split. Therefore, charge carriers having a smaller effective mass, which have been induced by an electric field applied to an insulated gate electrode (15,16), are confined in the Si 1-y C y layer, and move in the channel direction. Furthermore, if the silicon layer containing carbon is made of Si 1-x-y Ge x C y , a structure suitable for a high-performance CMOS device can be formed. Alternatively, the silicon layers may contain a slight amount of carbon or germanium, and a Schottky gate may be provided whereby a MESFET is achieved.
摘要:
A semiconductor device comprises an Si substrate, an isolation insulating film formed on the Si substrate, an Si layer formed on the Si substrate, a gate oxide film formed on the Si layer, a gate electrode formed on the gate oxide film, a sidewall formed on the side face of the gate electrode, a gate silicide film formed on the gate electrode, source and drain regions formed at both the sides of the gate electrode and including a part of the Si layer, and a silicide film formed on the source and drain regions. Because the source and drain regions are formed on a layer-insulating film so as to be overlayed, it is possible to decrease the active region and cell area of a device. Thereby, a high-speed operation and high integration can be realized.
摘要:
A HDTMOS includes a Si substrate, a buried oxide film and a semiconductor layer. The semiconductor layer includes an upper Si film, an epitaxially grown Si buffer layer, an epitaxially grown SiGe film, and an epitaxially grown Si film. Furthermore, the HDTMOS includes an n-type high concentration Si body region, an n - Si region, a SiGe channel region containing n-type low concentration impurities, an n-type low concentration Si cap layer, and a contact which is a conductor member for electrically connecting the gate electrode and the Si body region. The present invention extends the operation range while keeping the threshold voltage small by using, for the channel layer, a material having a smaller potential at the band edge where carriers travel than that of a material constituting the body region.
摘要:
In the method for fabricating a semiconductor device of the present invention, a collector layer (102) of a first conductivity type is formed in a region of a semiconductor substrate (100) sandwiched by device isolation. A collector opening (110) is formed through a first insulating layer (108) deposited on the semiconductor substrate (100) so that the range of the collector opening (110) covers the collector layer (102) and part of the device isolation. A semiconductor layer of a second conductivity type (111) as an external base is formed on a portion of the semiconductor substrate located inside the collector opening (110), while junction leak prevention layers of the same conductivity type as the external base are formed in the semiconductor substrate. Thus, the active region is narrower than the collector opening reducing the transistor area, while minimizing junction leak.
摘要:
A variable capacitor includes an N + layer including a variable capacitance region, a P + layer epitaxially grown on the N + layer and formed from a SiGe film and a Si film, and a P-type electrode. An NPN-HBT (Hetero-junction Bipolar Transistor) includes a collector diffusion layer formed simultaneously with the N + layer of the variable capacitor, a collector layer, and a Si/SiGe layer epitaxially grown simultaneously with the P + layer of the variable capacitor. Since a depletion layer formed in a PN junction of the variable capacitor can extend entirely across the N + layer, reduction in variation range of the capacitance can be suppressed.
摘要:
In the method for fabricating a semiconductor device of the present invention, a collector layer of a first conductivity type is formed in a region of a semiconductor substrate sandwiched by device isolation. A collector opening is formed through a first insulating layer deposited on the semiconductor substrate so that the range of the collector opening covers the collector layer and part of the device isolation. A semiconductor layer of a second conductivity type as an external base is formed on a portion of the semiconductor substrate located inside the collector opening, while junction leak prevention layers of the same conductivity type as the external base are formed in the semiconductor substrate. Thus, the active region is narrower than the collector opening reducing the transistor area, while minimizing junction leak.