摘要:
A lateral short-channel DMOS is formed in the vicinity of the surface of an N -type epitaxial layer, and the surface of the N -type epitaxial layer is almost depleted when a reverse bias is applied. A lateral short-channel DMOS (10A) comprises a P-type well (114)which is formed in the vicinity of the surface of an N -type epitaxial layer (110) and includes a channel forming region (C), an N -type source region (116) formed in the vicinity of the surface of the P-type well (114), and an N -type well (140) formed in the vicinity of the surface of the N -type epitaxial layer (110). The concentration of the N -type well (140) is higher than that of the N -type epitaxial layer (110) and lower than that of an N -type drain region (118). The N -type drain region (118) is formed in the vicinity of the surface of the N -type well (140). Consequently, the lateral short-channel DMOS is excellent in high pressure resistance and current drive characteristics.
摘要翻译:在N +型外延层的表面附近形成横向短沟道DMOS,并且当施加反向偏压时N +型外延层的表面几乎被耗尽。 横向短沟道DMOS(10A)包括形成在N +型外延层(110)的表面附近的P型阱(114),并且包括沟道形成区域(C), 形成在P型阱(114)的表面附近的N +型源区(116)和形成在P型阱的表面附近的N +型阱(140) N +型外延层(110)。 N +型阱(140)的浓度高于N +型外延层(110)的浓度,并且低于N +型漏极区域(118)的浓度。 N +型漏区(118)形成在N +型阱(140)的表面附近。 因此,横向短路DMOS具有优异的耐高压性和电流驱动特性。
摘要:
A field effect transistor structure is formed with a body semiconductor layer (1) having source (3), channel (7), drift region (9) and drain (5). An upper metallisation layer (15,17) is separated from the body by an oxide layer (11). The upper metallisation layer (15,17) has a gate region (15) arranged over the body and a field plate region (17) arranged over the drift region (9). A source contact (39) is connected to both the source (9) and the field plate region (25).
摘要:
The invention relates to a method for producing a DMOS transistor structure. The invention is advantageous in that a protective layer (14) is used to protect the already essentially completed DMOS transistor structure from the negative effects of additional process steps. According to the invention, the DMOS gate electrode is not customarily structured, as in the prior art, by using a single lithography step, rather the structuring of the DMOS gate electrode is split between two lithography steps. In a first lithography step, essentially only the source region (9) of the DMOS transistor structure is opened, whereby the electrode layer still present can be used as a mask for the subsequent production of the body region (8).
摘要:
A lateral thin-film Silicon-On-Insulator (SOI) device includes a semiconductor substrate, a buried insulating layer on the substrate and a lateral transistor device in an SOI layer on the buried insulating layer and having a source region of a first conductivity type formed in a body region of a second conductivity type opposite to that of the first. A lateral drift region of a first conductivity type is provided adjacent the body region, and a drain region of the first conductivity type is provided laterally spaced apart from the body region by the drift region. A gate electrode is provided over a part of the body region in which a channel region is formed during operation and extending over a part of the lateral drift region adjacent the body region, with the gate electrode being at least substantially insulated from the body region and drift region by an insulation region. In order to provide improved breakdown voltage characteristics, a dielectric layer is provided over at least a part of the insulation region and the gate electrode, and a field plate electrode is provided over at least a part of the dielectric layer which is in direct contact with the insulation region, with the field plate electrode being connected to an electrode of the lateral transistor device.
摘要:
The invention relates to a lateral high-voltage semiconductor component which is provided with p-conducting and n-conducting layers (13, 14) which extend in a lateral direction. The dose of said layers amounts to 2a x 10 charge carrier cm . Said layers can be provided with a lateral doping concentration profile (a = 0,5 ... 50). The topmost layer is provided with a dose of a x 10 charge carrier cm while the lowest layer has a dose of (a to 2a) x 10 charge carrier cm . Said semiconductor layers (13, 14) can be floating or can be linked with, e.g. a body source region (5, 4).
摘要:
The present invention is directed to an SOI LDMOS device having improved current handling capability, particularly in the source-follower mode, while maintaining an improved breakdown voltage capability. The improvement in current handling capability is achieved in a first embodiment by introducing an offset region between the source and thin drift regions. The offset region achieves an offset between the onset of the linear doping profile and the thinning of the SOI layer that results in the thin drift region. In a second embodiment a further increase in the current handling capability of an SOI device is achieved by fabricating an oxide layer over the offset region, with the thickness of the oxide layer varying up to about half the thickness of the oxide layer fabricated over the thin drift region.
摘要:
A quasi-lateral diffusion transistor is formed in a semiconductor-on-insulator (SOI) wafer by forming a gate region, a body region, a drift region, and a source region and bonding a handle wafer to the SOI wafer at a first side (e.g., top side) of the SOI wafer; and removing a semiconductor substrate of the SOI wafer, forming a hole in a buried insulator layer of the SOI wafer, and forming a drain region for the transistor at a second side (e.g., bottom side) of the SOI wafer. The body region and the drift region physically contact the buried insulator layer. The drain region is formed in a bottom portion of the drift region exposed by the hole and is laterally offset from the source region. In operation of the quasi-lateral diffusion transistor, a current flow direction through the semiconductor layer is diagonal between the source region and the drain region.
摘要:
An LDFET is disclosed. A source region is electrically coupled to a source contact. A lightly doped drain (LDD) region has a lower dopant concentration than the source region, and is separated from the source region by a channel. A highly doped drain region forms an electrically conductive path between a drain contact and the LDD region. A gate electrode is located above the channel and separated from the channel by a gate dielectric. A shield plate is located above the gate electrode and the LDD region, and is separated from the LDD region, the gate electrode, and the source contact by a dielectric layer. A control circuit applies a variable voltage to the shield plate that: (1) accumulates a top layer of the LDD region before the transistor is switched on; and (2) depletes the top layer of the LDD region before the transistor is switched off.
摘要:
Planar and non-planar field effect transistors with extended-drain structures, and techniques to fabricate such structures. In an embodiment, a field plate electrode is disposed over an extended-drain, with a field plate dielectric there between. The field plate is disposed farther from the transistor drain than the transistor gate. In a further embodiment, an extended-drain transistor has source and drain contact metal at approximately twice a pitch, of the field plate and the source and/or drain contact metal. In a further embodiment, an isolation dielectric distinct from the gate dielectric is disposed between the extended-drain and the field plate. In a further embodiment, the field plate may be directly coupled to one or more of the transistor gate electrode or a dummy gate electrode without requiring upper level interconnection. In an embodiment, a deep well implant may be disposed between a lightly-doped extended-drain and a substrate to reduce drain-body junction capacitance and improve transistor performance.