摘要:
Oxygen ion is implanted into a silicon substrate to remain a silicon layer on a surface of the silicon substrate. In this state, a silicon oxide layer is formed under the silicon layer. Silicon oxide particles are formed and remained in the residual silicon layer. While maintaining this state, the silicon substrate is heated to a predetermined temperature not less than 1300.degree. C. Alternatively, the silicon substrate is heated at a high temperature-rise rate to 900.degree.-1100.degree. C., and thereafter is heated at a low temperature-rise rate to the temperature not less than 1300.degree. C. The silicon substrate is held at the predetermined temperature not less than 1300.degree. C. for a predetermined time, whereby crystallinity of the residual silicon layer is restored. A pinning effect of the silicon oxide particles prevents the rise of dislocation to the surface of the SOI layer, and also suppresses a rate per a unit time at which interstitial silicon generates during the heating to the high temperature region. Therefore, a dislocation density of the SOI layer can be reduced.
摘要:
A polysilicon layer is formed on a surface of a silicon substrate after oxygen ions are implanted into the silicon substrate and an SiO.sub.2 film is formed in the silicon substrate at a position in a prescribed depth from the surface of silicon substrate. A heat treatment is performed to a silicon layer between the polysilicon layer and the SiO.sub.2 film, thereby providing an SOI layer with improved crystal quality.
摘要:
A semiconductor device including an NMOS transistor includes a first bias generating circuit 30 for generating a substrate bias VBB1 for making smaller the amount of leak current in an inactive state, a second bias generating circuit 31 for generating a substrate bias VBB2 for increasing drivability of supplying current in the active state of the NMOS transistor, and a bias selecting circuit 32 responsive to a control signal CNT for supplying the substrate bias VBB2 instead of the substrate bias VBB1 to the silicon substrate 1. By changing the potential of the substrate bias in the standby state and the active state, power consumption in the standby state can be reduced and the speed of operation in the active state can be improved.
摘要:
A polysilicon or amorphous Si layer is formed on a surface of a silicon substrate. Oxygen ions are implanted into the silicon substrate through the polysilicon layer, and an SiO.sub.2 film is formed in the silicon substrate at a position in a prescribed depth from the surface of silicon substrate. A heat treatment is performed to a silicon layer between the polysilicon layer and the SiO.sub.2 film, thereby providing an SOI layer with improved crystal quality.
摘要:
An MOS field effect transistor comprises a channel region (6) of a first conductivity type formed in a semiconductor layer (3) on an insulator substrate (2), a source region (8) and a drain region (9) of a second conductivity type formed in contact with one and the other sides of the channel region (6) in the semiconductor layer (3), respectively, a body region (7) formed in contact with at least a part of the channel region (6) and a part of a periphery of the source region (8) in the semiconductor layer (3) and having a higher impurity concentration than that of the channel region (6), a gate electric thin film (4) and a gate electrode (5) formed on the channel region (6), and a conductor (14a) connected in common to the source region (8) and the body region (7).
摘要:
An MOS field effect transistor comprises a channel region (6) of a first conductivity type formed in a semiconductor layer (3) on an insulator substrate (2), a source region (8) and a drain region (9) of a second conductivity type formed in contact with one and the other sides of the channel region (6) in the semiconductor layer (3), respectively, a body region (7) formed in contact with at least a part of the channel region (6) and a part of a periphery of the source region (8) in the semiconductor layer (3) and having a higher impurity concentration than that of the channel region (6), a gate dielectric thin film (4) and a gate electrode (5) formed on the channel region (6), and a conductor (14a) connected in common to the source region (8) and the body region (7).
摘要:
It is an object to obtain a semiconductor device with the LDD structure having both operational stability and high speed and a manufacturing method thereof. A high concentration region (11) with boron of about 1.times.10.sup.18 /cm.sup.3 introduced therein is formed extending from under a channel formation region (4) to under a drain region (6) and a source region (6') in a silicon substrate (1). The high concentration region (11) is formed in the surface of the silicon substrate (1) under the channel formation region (4), and is formed at a predetermined depth from the surface of the silicon substrate (1) under the drain region (6) and the source region (6'). A low concentration region (10) is formed in the surface of the silicon substrate (1) under the drain region (6) and the source region (6'). The formation of the high concentration region only in the surface of the semiconductor substrate under the channel formation region surely suppresses an increase in the leakage current and an increase in the drain capacitance.
摘要:
Disclosed is an apparatus for detecting the three-dimensional configuration of an object employing an optical cutting method. A light projector pulse-flashes slit-shaped light and causes the light to scan an object at a predetermined speed. An image sensor having a plurality of pixels is disposed in opposition to the object. An optical system forms on the image sensor an image of an optical cutting line formed on the surface of the object by the light. Counters each count the number of pulses of the image of the optical cutting line that has been detected by each pixel. A time calculator calculates the time at which the image has passed each of the pixels, on the basis of the counted numbers of pulses. A configuration calculator calculates the three-dimensional configuration of the object on the basis of the calculated passage time and the scanning speed of the slit-shaped light. Because the counted numbers of pulses, which are each indicative of the period of time required for the image of the optical cutting line to pass each pixel, are used to calculate the passage time, there is no need to provide a data bus to transmit time data with respect to the each pixel. Thus, the apparatus has simple wiring arrangement, and can be manufactured with ease.
摘要:
FS-isolated fields (10a, 10b). LOCOS-isolated fields (11c, 11d). FS-isolated fields (10e, 10f), LOCOS-isolated field (11g, 11h) and FS-isolated field (10i) are arranged in this order. Thus, a master layout can he provided, where SOI transistors having bodies to be supplied with fixed potential and those having bodies not to be supplied with fixed potential are mixed.
摘要:
It is an object to obtain a semiconductor device with the LDD structure having both operational stability and high speed and a manufacturing method thereof. A high concentration region (11) with boron of about 1.times.10.sup.18 /cm.sup.3 introduced therein is formed extending from under a channel formation region (4) to under a drain region (6) and a source region (6') in a silicon substrate (1). The high concentration region (11) is formed in the surface of the silicon substrate (1) under the channel formation region (4), and is formed at a predetermined depth from the surface of the silicon substrate (1) under the drain region (6) and the source region (6'). A low concentration region (10) is formed in the surface of the silicon substrate (1) under the drain region (6) and the source region (6'). The formation of the high concentration region only in the surface of the semiconductor substrate under the channel formation region surely suppresses an increase in the leakage current and an increase in the drain capacitance.