Abstract:
Zur herstellung eines Halbleiterbauelements mit einer im Querschnitt T-förmigen Kontaktelektrode, insbesondere eines Feldeffekt-Transistors mit T-Gate, wird ein Verfahren beschrieben, bei welchem mittels eines an einer Materialkante erzeugten Spacers eine selbstjustierende Positionierung von Gatefuß und Gatekopf erfolgt.
Abstract:
A process for producing a semiconductor device (10) includes depositing a layer of insulator material onto a supporting substrate (12) of the type having a surface which includes a channel region below the surface thereof containing a carrier concentration of a desired conductivity type, removing selected portions of the insulator material to form a substitutional gate on the substrate surface, forming side walls bounding the substitutional gate to define an effective masking area in cooperation with the substitutional gate, ion implanting a dopant into the unmasked region of the substrate, removing the side walls, annealing the resultant device, removing the substitutional gate, depositing gate metal (22) and first and second ohmic contacts (24, 26) in correct positional relation to one another on the substrate, and depositing metallic interconnects (28) in electrical communication with the ohmic contacts to produce a semiconductor device. This technique is especially useful in the production of Group III-V compound semiconductors, particularly gallium arsenide semiconductors.
Abstract:
According to one aspect of the inventive concept there is provided a process for manufacturing a semiconductor device, comprising: providing a channel layer (104), providing a mask (106)on the channel layer, epitaxially growing a contact layer (108) in contact with the channel layer, epitaxially growing a support layer (110) on the contact layer, wherein the support layer is arranged to be etched at a higher rate than the contact layer, forming a trench extending through the support layer by removing the mask, and providing a conductor (118) in the trench. There is also provided an intermediate product for the manufacture of a semiconductor device.
Abstract:
A quantum well transistor or high electron mobility- transistor may be formed using a replacement metal gate process. A dummy gate electrode may be used to define sidewall spacers and source drain contact metallizations. The dummy gate electrode may be removed and the remaining structure used as a mask to etch a doped layer to form sources and drains self -aligned to said opening. A high dielectric constant material may coat the sides of said opening and then a metal gate electrode may be deposited. As a result, the sources and drains are self-aligned to the metal gate electrode. In addition, the metal gate electrode is isolated from an underlying barrier layer by the high dielectric constant material .
Abstract:
An enhancement mode semiconductor device has a barrier layer (102) disposed between the gate electrode (104) of the device and the semiconductor substrate (106) underlying the gate electrode (104). The barrier layer (102) increases the Schottky barrier height of the gate electrode-barrier layer-substrate interface so that the portion of the substrate (106) underlying the gate electrode (104) operates in an enhancement mode. The barrier layer (102) is particularly useful in compound semiconductor field effect transistors, and preferred materials for the barrier layer include aluminum gallium arsenide and indium gallium arsenide.
Abstract:
A method of forming a transistor device includes forming an interfacial layer and a dielectric layer over a substrate; and forming a workfunction metal layer over the dielectric layer, the workfunction metal layer comprising a titanium-aluminum-carbon-oxygen (TiA1CO) layer.
Abstract:
Methods of forming semiconductor devices having customized contacts are provided including providing a first insulator layer and patterning the first insulator layer such that the first insulator layer defines at least one contact window. A second insulator layer is provided on the first insulator layer and in the at least one contact window such that the second insulator layer at least partially fills the at least one contact window. A first portion of the second insulator layer is etched such that a second portion of the second insulator layer remains in the at least one contact window to provide at least one modified contact window having dimensions that are different than dimensions of the at least one contact window. Related methods and devices are also provided.
Abstract:
Methods of forming Group III-nitride transistor device include forming a protective layer on a Group III-nitride semiconductor layer, forming a via hole through the protective layer to expose a portion of the Group III-nitride semiconductor layer, and forming a masking gate on the protective layer. The masking gate includes an upper portion having a width that is larger than a width of the via hole and having a lower portion extending into the via hole. The methods further include implanting source/drain regions in the Group III-nitride semiconductor layer using the masking gate as an implant mask.
Abstract:
In an FET, such as the high-output FET, low-noise HEMT, etc., a layer (for example, a super lattice buffer layer) which promotes carrier recombination, an undoped compound semiconductor layer which is higher in resistance than a channel layer composed of a compound semiconductor, and the channel layer are successively laminated. Since, for example, an oxygen gas is introduced to the carrier recombination promoting layer at a high concentration, non-radiative recombination is promoted and the lives of injected carriers become shorter. The carrier recombination promoting layer can also be formed by forming a super lattice buffer layer at a lower temperature rather than forming the channel layer. Therefore, the efficiency and withstand voltage of the FET are further improved at the time of operating the FET under a high-frequency high-output condition. In addition, the noise of the FET can be reduced further when the FET is operated under a high-frequency low-noise condition.
Abstract translation:提供了高质量的Ga 2 O 3半导体元件。 作为本发明的一个实施方案,提供了一种Ga 2 O 3 MESFET(10),其包括:形成在α-Al 2 O 3衬底上的n型α-(Al x Ga 1-x)2 O 3单晶膜(3) 2)直接或与其间的其它层,并由α - (Al x Ga 1-x)2 O 3单晶(0 <= x <1)组成; 形成在n型α - (Al x Ga 1-x)2 O 3单晶膜(3)上的源电极(12)和漏电极(13)。 以及形成在n型α - (Al x Ga 1-x)2 O 3单晶膜(3)上的源电极(12)和漏电极(13)之间的区域上的栅电极(11)。