摘要:
In one embodiment, a semiconductor device (500) includes a buffer layer (504) formed over a substrate (502). An AlxGa1−xAs layer (506) is formed over the buffer layer (504) and has a first doped region (508) formed therein. An InxGa1−xAs channel layer (512) is formed over the AlxGa1−xAs layer (506). An AlxGa1−xAs layer (518) is formed over the InxGa1−xAs channel layer (512), and the AlxGa1−xAs layer (518) has a second doped region formed therein. A GaAs layer (520) having a first recess is formed over the AlxGa1−xAs layer (518). A control electrode (526) is formed over the AlxGa1−xAs layer (518). A doped GaAs layer (524) is formed over the undoped GaAs layer (520) and on opposite sides of the control electrode (526) and provides first and second current electrodes. When used to amplify a digital modulation signal, the semiconductor device (500) maintains linear operation over a wide temperature range.
摘要翻译:在一个实施例中,半导体器件(500)包括形成在衬底(502)上的缓冲层(504)。 在缓冲层(504)之上形成Al x Ga 1-x As层(506),并且在其中形成有第一掺杂区域(508)。 在Al x Ga 1-x SUB>上形成一个In 1 / x Ga 1-x As As沟道层(512) >作为层(506)。 在In 1 x 1 Ga 1-x N上形成Al x Ga 1-x As层(518) 作为沟道层(512)和Al x Ga 1-x As层(518)具有形成在其中的第二掺杂区域。 具有第一凹陷的GaAs层(520)形成在Al 1 Ga 1-x As层(518)上。 控制电极(526)形成在Al 1 Ga 1-x As As层(518)上。 在未掺杂的GaAs层(520)上和控制电极(526)的相对侧上形成掺杂GaAs层(524),并提供第一和第二电流电极。 当用于放大数字调制信号时,半导体器件(500)在宽的温度范围内保持线性操作。
摘要:
A method of forming a compound semiconductor device comprises forming a gate insulator layer overlying a compound semiconductor substrate, defining an active device region within the compound semiconductor substrate, forming ohmic contacts to the compound semiconductor substrate proximate opposite sides of the active device region, and forming a gate metal contact electrode on the gate insulator layer in a region between the ohmic contacts. The ohmic contacts having portions thereof that overlap with portions of the gate insulator layer within the active device region. The overlapping portions ensure an avoidance of an undesirable gap formation between an edge of the ohmic contact and a corresponding edge of the gate insulator layer.
摘要:
A method of forming a dielectric layer structure on a supporting semiconductor structure having a first surface comprises providing a first beam of oxide; depositing a first layer of oxide on the first surface of the supporting semiconductor structure using the first beam of oxide, wherein the first layer of oxide has a second surface; terminating the first beam of oxide, and concurrently providing a second beam of oxide, a beam of metal and a beam of oxygen, wherein the first and second beams of oxide are separate and distinct beams of oxide; and depositing a second layer of oxide on the second surface simultaneously using the second beam of oxide, the beam of metal, and the beam of oxygen.
摘要:
A gate quality oxide-compound semiconductor structure (10) is formed by the steps of providing a III-V compound semiconductor wafer structure (13) with an atomically ordered and chemically clean semiconductor surface in an ultra high vacuum (UHV) system (20), directing a molecular beam (26) of gallium oxide onto the surface of the wafer structure to initiate the oxide deposition, and providing a second beam (28) of atomic oxygen to form a Ga.sub.2 O.sub.3 layer (14) with low defect density on the surface of the wafer structure. The second beam of atomic oxygen is supplied upon completion of the first 1-2 monolayers of Ga.sub.2 O.sub.3. The molecular beam of gallium oxide is provided by thermal evaporation from a crystalline Ga.sub.2 O.sub.3 or gallate source, and the atomic beam of oxygen is provided by either RF or microwave plasma discharge, thermal dissociation, or a neutral electron stimulated desorption atom source.
摘要翻译:通过在超高真空(UHV)系统(20)中提供具有原子级和化学清洁的半导体表面的III-V化合物半导体晶片结构(13)的步骤形成栅极质量氧化物 - 化合物半导体结构(10) 将氧化镓的分子束(26)引导到晶片结构的表面上以引发氧化物沉积,以及提供原子氧的第二光束(28)以在表面上形成具有低缺陷密度的Ga 2 O 3层(14) 的晶片结构。 当第一个1-2单层的Ga2O3完成时,第二个原子氧束被提供。 通过从结晶Ga 2 O 3或没食子酸酯源的热蒸发提供氧化镓的分子束,并且氧原子束由RF或微波等离子体放电,热解离或中性电子刺激的解吸原子源提供。
摘要:
A method of fabricating a gate quality oxide-compound semiconductor structure includes forming an insulating Ga.sub.2 O.sub.3 layer on the surface of a compound semiconductor wafer structure by a supersonic gas jet containing gallium oxide molecules and oxygen. In a preferred embodiment, a III-V compound semiconductor wafer structure with an atomically ordered and chemically clean semiconductor surface is transferred from a semiconductor growth chamber into an insulator deposition chamber via an ultra high vacuum preparation chamber. Ga.sub.2 O.sub.3 deposition onto the surface of the wafer structure is initiated by a supersonic gas jet pulse and proceeds via optimization of pulse duration, speed of gas jet, mole fraction of gallium oxide molecules and oxygen atoms, and plasma energy.
摘要翻译:制造栅极质量氧化物半导体结构的方法包括通过含有氧化镓分子和氧的超音速气体射流在化合物半导体晶片结构的表面上形成绝缘Ga 2 O 3层。 在优选实施例中,具有原子级和化学清洁的半导体表面的III-V族化合物半导体晶片结构经由超高真空准备室从半导体生长室转移到绝缘体沉积室中。 通过超音速气体喷射脉冲引发晶片结构表面上的Ga 2 O 3沉积,并且经历脉冲持续时间,气体射流速度,氧化镓分子和氧原子的摩尔分数以及等离子体能量的优化。
摘要:
A uni-terminal transistor device is described. In one embodiment, an n-channel transistor comprises a first semiconductor layer having a discrete hole level H0; a second semiconductor layer having a conduction band minimum EC2; a wide bandgap semiconductor barrier layer disposed between the first and the second semiconductor layers; a gate dielectric layer disposed above the first semiconductor layer; and a gate metal layer disposed above the gate dielectric layer and having an effective workfunction selected to position the discrete hole level H0 below the conduction band minimum Ec2 for zero bias applied to the gate metal layer and to obtain n-terminal characteristics.
摘要:
Among other things, one or more techniques for forming a vertical tunnel field effect transistor (FET), and a resulting vertical tunnel FET are provided herein. In an embodiment, the vertical tunnel FET is formed by forming a core over a first type substrate region, forming a second type channel shell around a circumference greater than a core circumference, forming a gate dielectric around a circumference greater than the core circumference, forming a gate electrode around a circumference greater than the core circumference, and forming a second type region over a portion of the second type channel shell, where the second type has a doping opposite a doping of the first type. In this manner, line tunneling is enabled, thus providing enhanced tunneling efficiency for a vertical tunnel FET.
摘要:
A Fin Field-Effect Transistor (FinFET) includes a fin, which includes a channel splitter having a first bandgap, and a channel including a first portion and a second portion on opposite sidewalls of the channel splitter. The channel has a second bandgap smaller than the first bandgap. A gate electrode includes a first portion and a second portion on opposite sides of the fin. A gate insulator includes a first portion between the first portion of the gate electrode and the first portion of the channel, and a second portion between the second portion of the gate electrode and the second portion of the channel.
摘要:
Embodiments include semiconductor devices with low leakage Schottky contacts. An embodiment is formed by providing a partially completed semiconductor device including a substrate, a semiconductor on the substrate, and a passivation layer on the semiconductor, and using a first mask, locally etching the passivation layer to expose a portion of the semiconductor. Without removing the first mask, a Schottky contact is formed of a first material on the exposed portion of the semiconductor, and the first mask is removed. Using a further mask, a step-gate conductor of a second material electrically coupled to the Schottky contact is formed overlying parts of the passivation layer adjacent to the Schottky contact. By minimizing the process steps between opening the Schottky contact window in the passivation layer and forming the Schottky contact material in this window, the gate leakage of a resulting field effect device having a Schottky gate may be substantially reduced.
摘要:
Layer structures for use in density of states (“DOS”) engineered FETs are described. One embodiment comprises a layer structure for use in fabricating an n-channel transistor. The layer structure includes a first semiconductor layer having a conduction band minimum EC1; a second semiconductor layer having a discrete hole level H0; a wide bandgap semiconductor barrier layer disposed between the first and the second semiconductor layers; a gate dielectric layer disposed above the first semiconductor layer; and a gate metal layer disposed above the gate dielectric layer; wherein the discrete hole level H0 is positioned below the conduction band minimum Ec1 for zero bias applied to the gate metal layer.