摘要:
An isolation layer for suppressing a leakage current is provided at least between a channel layer and a buffer layer formed under the channel layer in the buffer layer.
摘要:
A method for evaluating semiconductor layers includes irradiating semiconductor layers on a substrate with light; measuring an optical spectrum peculiar to excitons in the semiconductor layers; and analyzing a broadening factor of optical spectral features of the optical spectrum. The method provides a quick measurement of a surface state of the semiconductor layers with high accuracy.
摘要:
In a method for evaluating a crystalline semiconductor substrate which includes a collector layer, a base layer, and an emitter layer and is used for a heterojunction bipolar transistor, a layer is provided having the same composition as the base layer. The semiconductor substrate is irradiated with excitation light and change with time in intensity of photoluminescence from the layer is measured before the intensity becomes saturated. The change with time in current gain of the heterojunction bipolar transistor produced using the semiconductor substrate is determined from the change with time in the intensity.
摘要:
A hetero-junction bipolar transistor having high reliability wherein a ballast resistance is exactly controlled and deterioration in current stability is eliminated. A GaAs ballast resistor layer is provided in a hetero-junction bipolar transistor having a GaAs emitter layer, an InGaP spacer layer, and a GaAs base layer, preventing a notch from being formed in the conduction band at the interface of the emitter layer and the ballast resistor layer, exactly controlling the ballast resistance. The AlGaAs layer is prevented from trapping impurities and the current stability is prevented from deteriorating.
摘要:
In a field effect transistor including active layers having a heterojunction structure with at least two different semiconductor materials, a layer for supplying electrons is disposed opposite a drain electrode, in contact with a region of the active layers including a dopant impurity producing n type conductivity. Therefore, degradation of the electrical characteristics caused by trapping of electrons in a drain ohmic contact layer due to fluorine diffusing into the semiconductor layers is suppressed by supplying electrons from the layer opposite the drain electrode, thereby improving reliability of the field effect transistor including the heterojunction structure.
摘要:
A field effect transistor includes a semi-insulating III-V compound semiconductor substrate; a channel layer disposed on the substrate; an n type electron supply layer disposed on the channel layer and comprising a mixed crystalline compound semiconductor layer including AlAs; an n type ohmic contact layer disposed on the electron supply layer; source and drain electrodes disposed on the ohmic contact layer; an opening in a region between the source and drain electrodes penetrating the ohmic contact layer; a gate electrode disposed in the opening and making a Schotty contact; and a surface protection film of a semiconductor material free of Al, In, and As, covering the opening except where the gate electrode is present. Fluorine is prevented from getting into the electron supply layer with no increase in transconductance or source resistance by providing a layer between the source and a channel, and between the gate and the channel.
摘要:
An isolation layer for suppressing a leakage current is provided at least between a channel layer and a buffer layer formed under the channel layer in the buffer layer.
摘要:
An N-type collector layer is partially formed on an N+-type collector contact layer. The N-type collector layer includes a second N-type collector layer that is partially formed on the N+-type collector contact layer and relatively hard to deplete, and a first N-type collector layer that is formed on the whole surface of the second N-type collector layer and depleted relatively easily. A P+-type base layer including a high concentration P-type impurity is formed on the whole surface of the first N-type collector layer.
摘要:
In a measuring apparatus for a semiconductor multiple layer structure, a spectrometer disperses light from a sample for measurement of the photoluminescence spectrum or disperses probe light to irradiate the sample for the measurement of the reflection spectrum. A controller makes a guide member guide the white light to the spectrometer and acquire electric signals from a first detector for the measurement of the reflection spectrum, and makes the guide member guide the light from the spectrometer to a second detector to acquire electric signals for the measurement of the photoluminescence spectrum.
摘要:
A semiconductor device includes an InP substrate; a channel layer in which electrons, as charge carriers, travel; and an Al.sub.x1 Ga.sub.1-x1 As.sub.y1 P.sub.z1 Sb.sub.1-y1-z1 (0.ltoreq.x1.ltoreq.1, 0.ltoreq.y1
摘要翻译:半导体器件包括InP衬底; 电子作为电荷载流子的沟道层; 以及用于向沟道层提供电子的Al x Ga 1-x As y 1 P z 1 Sb 1-y 1-z 1(0 <= = 1,...,0 y1 <1,0 )电子供应层。 电子供给层的电子亲和力小于沟道层的电子亲和力,并且掺杂有产生n型导电性的掺杂剂杂质。 由于n型AlGaAsPSb是热稳定的,因此在350℃左右的热处理不会改变其电特性,导致热稳定性和高可靠性的HEMT,其特性在制造和操作期间几乎不随时间变化。 此外,在设计器件时,容易产生包括电子供给层和沟道层并且具有期望的能带结构的异质结构。