摘要:
There is disclosed a method of manufacturing a high voltage, HV, device with a BCD process. The method comprises undertaking a Local Oxidation of Silicon, LOCOS, fabrication process to form a recessed insulating structure prior to undertaking a Bipolar CMOS DMOS, BCD, fabrication process to form a plurality of device layers on the recessed insulating structure.
摘要:
A semiconductor substrate (100) is acquired by forming a mask with a target thickness on a major surface of a single-crystal silicon substrate, implanting oxygen ions to the major surface at a high temperature, forming a surface protection layer for blocking oxygen on the major surface, performing annealing, and then stripping off the mask and the surface protection layer. A silicon dioxide layer (102) has a first top surface (102a) corresponding to an area where the mask has not existed and having a relatively long distance from the major surface (100a), and a second top surface (102b) corresponding to an area where the mask has existed and having a relatively short distance from the major surface (100a). As this major surface (100a) is polished by a predetermined quantity, a semiconductor substrate is provided in which only a part of a single-crystal silicon substrate is a SOI substrate.
摘要:
The invention concerns a MOSFET transistor comprising a silicon layer portion (114), forming an active region (114a), arranged between a grid oxide layer (120) and a buried oxide layer (112), and laterally delimited by lateral insulating oxide tiles (116). The silicon layer portion has concave edges (122, 124) facing the lateral insulating oxide tiles. The invention is useful in the manufacture of integrated circuits with low electricity consumption.
摘要:
A method for forming an isolation structure (22) on a SOI substrate (11) is provided. A three layer stack of an etchant barrier layer (16), a stress relief layer (17), and an oxide mask layer (18) is formed on the SOI substrate (11). The three layer stack is patterned and etched to expose portions of the etchant barrier layer (16). The silicon layer (13) below the exposed portions of the etchant barrier layer (16) is oxidized to form the isolation structure (22). The isolation structure (22) comprises a bird's head region (21) with a small encroachment which results in higher edge threshold voltage. The method requires minimum over-oxidation and provides for an isolation structure (22) that leaves the SOI substrate (11) planar. Minimal over-oxidation reduces the number of dislocations formed during the oxidation process and improves the source to drain leakage of the device.
摘要:
A semiconductor device has an insulated gate transistor in which source and drain regions are provided in a single crystal semiconductor layer formed on an insulating layer with a channel region interposed between the source and drain regions. An insulating layers just below the source and drain regions are made thicker than an insulating layer just below the channel region.
摘要:
A SIMOX substrate 1 is processed through high temperature oxidation treatment after forming a mask-pattern 3 to shield specified electrodes from oxidation in order to increase partly a thickness of a buried oxide layer 2 to form an area 4. Next, after an oxide film is removed from the surface of the substrate and LOCOS separation is practiced, MOSFET is produced by fabricating a source S and a drain D on the area 4 or the buried oxide layer 2. Since the buried oxide layer corresponding to electrodes parts influenced by disadvantages of parasitic capacitance are thickened, an operation speed of an inverter is not much decreased and since mean thickness of the buried oxide layer can be thinner, a decrease of a drain electric current by negative electrical resistance can be suppressed. Furthermore, since the thickness of the buried oxide layer can be controlled in response to each device, plural devices having different breakdown voltages are formed together on the same substrate.
摘要:
A method of semiconductor integrated circuit fabrication is disclosed. An amorphous silicon layer (e.g., 15) is deposited between an oxide layer (e.g., 13) and a nitride layer (e.g., 17) in an improved poly buffered LOCOS process. When the amorphous silicon (e.g., 15) is oxidized it provides a field oxide (e.g., 23) with a smoother upper surface.