WO2004034475A1 - プラズマ振動スイッチング素子 - Google Patents
プラズマ振動スイッチング素子 Download PDFInfo
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- WO2004034475A1 WO2004034475A1 PCT/JP2003/012469 JP0312469W WO2004034475A1 WO 2004034475 A1 WO2004034475 A1 WO 2004034475A1 JP 0312469 W JP0312469 W JP 0312469W WO 2004034475 A1 WO2004034475 A1 WO 2004034475A1
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- 230000010355 oscillation Effects 0.000 title claims abstract description 50
- 230000004888 barrier function Effects 0.000 claims abstract description 73
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- 239000004047 hole gas Substances 0.000 claims abstract description 35
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/10—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1025—Channel region of field-effect devices
- H01L29/1029—Channel region of field-effect devices of field-effect transistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/778—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface
- H01L29/7782—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with confinement of carriers by at least two heterojunctions, e.g. DHHEMT, quantum well HEMT, DHMODFET
- H01L29/7783—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with confinement of carriers by at least two heterojunctions, e.g. DHHEMT, quantum well HEMT, DHMODFET using III-V semiconductor material
- H01L29/7785—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with confinement of carriers by at least two heterojunctions, e.g. DHHEMT, quantum well HEMT, DHMODFET using III-V semiconductor material with more than one donor layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/20—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only AIIIBV compounds
- H01L29/2003—Nitride compounds
Definitions
- the present invention relates to a semiconductor device, and more particularly, to a plasma vibration switching device that operates in a high frequency range.
- the operating speed of conventional semiconductor devices has been improved mainly by miniaturizing the device structure.
- a high electron mobility transistor the use of two-dimensionally distributed electrons effectively prevents the diffusion of impurities and improves the operation speed.
- the movement of charges (electrons) is used for signal transmission, and the speed of the movement is limited by the saturation speed of the material. Therefore, there is a limit in shortening the channel travel time, and there is a problem that high-speed operation is difficult.
- FIG. 7 is a cross-sectional view of the FET element shown in Document 1.
- Reference 3 Japanese Unexamined Patent Application Publication No. 8-1339306 describes a system in which two fluids composed of holes and electrons coexist, or a system in which two fluids composed of heavy electrons and light electrons coexist.
- An electromagnetic wave amplifying device utilizing the two-fluid instability phenomenon caused by the above has been proposed.
- FIG. 8 is a perspective view of the electromagnetic wave amplifying element shown in Document 3.
- Japanese Patent Application Laid-Open No. 2000-2946768 discloses the following semiconductor device capable of suppressing a leak current passing through an insulating film.
- An electron supply layer composed of n-type A 1 G a N and an electron transit layer composed of n-type G a N are provided on a substrate composed of sapphire via a buffer layer composed of undope—A 1 G N and an underlayer. They are sequentially stacked.
- a gate electrode 17 is provided on this electron transit layer via an insulating film made of A 1 N.
- the insulating film is grown at a temperature of 900 ° C. or less, and is composed of a plurality of columnar crystals.
- Japanese Unexamined Patent Application Publication No. 2000-250524 discloses the following semiconductor element capable of suppressing a leak current passing through an insulating film.
- An electron supply layer composed of n-type A 1 G a N and an electron transit layer composed of n-type G a N are provided on a substrate composed of sapphire via a buffer layer composed of undope—A 1 G N and an underlayer. They are sequentially stacked.
- a gate electrode is provided on the electron transit layer via an insulating film.
- Insulating film has a structure in which a second insulation film of a first insulating film and the S i 0 2 consisting of A 1 N are stacked in this order from the side of the electron transit layer. By providing the second insulating film, it is possible to suppress a leakage current generated only by the first insulating film.
- Japanese Unexamined Patent Application Publication No. Hei 8—2 7 4 3 4 6 discloses a method for obtaining a dual-gate FET with improved gate withstand voltage and improved characteristics, and obtaining a high-performance amplifier and mixer circuit by controlling the voltage of the dual-gate FET.
- the intrinsic partial conductance of the first gate electrode is larger than that of the second gate electrode when the first gate electrode is used, and the drain breakdown voltage is higher when the second gate electrode is used.
- the first gate electrode is made larger than the first gate electrode, the degradation of the transconductance is eliminated, and the withstand voltage of the device is improved.
- the present invention has been made to solve the above problem, and has as its object to provide a plasma vibration switching element capable of realizing a reliable operation in a high frequency region. Disclosure of the invention
- a plasma oscillation switching element has been made in order to solve the above problems, and has a substrate; a first barrier layer formed on the substrate and made of an m-V group compound semiconductor; A channel layer formed on the first barrier layer and made of an m-V group compound semiconductor; a second barrier layer formed on the channel layer and made of a ⁇ -V compound semiconductor; A source electrode, a gate electrode, and a drain electrode provided on the barrier layer, wherein the first barrier layer has one of an n-type diffusion layer and a p-type diffusion layer, and the second barrier layer has The barrier layer having the n-type diffusion layer has a conduction band edge energy (potential for electrons) greater than the conduction band edge energy of the channel layer; Has a diffusion layer The energy of the valence band edge of the barrier layer is smaller than the energy of the valence band edge of the channel layer, and the two-dimensional electron gas is accumulated at the interface between the barrier layer having the n-type diffusion layer and the channel layer.
- a two-dimensional hole gas is accumulated at an interface between the barrier layer having the p-type diffusion layer and the channel layer, and each of the electrodes electrostatically interacts with the two-dimensional electron gas and the two-dimensional hole gas.
- FIG. 1 is a cross-sectional view showing a first embodiment of a plasma vibration switching element according to the present invention.
- FIG. 2 is a diagram showing a band structure near the channel layer in FIG.
- FIG. 3 is a sectional view showing a second embodiment of the plasma vibration switching element according to the present invention.
- FIG. 4 is a diagram showing a change in the phase of the plasma oscillation.
- FIG. 5 is a sectional view showing another example of the second embodiment of the plasma vibration switching element according to the present invention.
- FIG. 6 shows a high-frequency modulation device using the plasma oscillation switching element according to the present invention.
- FIG. 7 is a cross-sectional view showing a conventional FET element shown in Reference 1. As shown in FIG.
- FIG. 8 is a perspective view of the conventional electromagnetic wave amplifying element shown in Reference 3. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a cross-sectional view of a plasma oscillation switching device according to the present embodiment.
- the switching element includes a semiconductor substrate 101 having a semi-insulating InP force to which Fe is added, and a semiconductor laminate S formed on the semiconductor substrate 101.
- the semiconductor laminate S is formed with a composition that lattice-matches with the semiconductor substrate 101, and is a non-doped InP layer 102 formed by epitaxial growth, a first barrier layer 103 made of InA1As, and a non-doped G layer.
- a A channel layer 104 made of InNAs and a second barrier layer 105 made of InA1As are stacked in this order.
- the 111? Layer 102 is formed to have substantially the same width (length in the left-right direction in FIG.
- the upper layer has a smaller width than the 111? It is formed in a shape.
- Most of the first barrier layer 103 is undoped, but a first diffusion layer 103a in which an n-type impurity is delta-doped is formed near the interface with the channel layer 104.
- the second barrier layer 105 is also largely non-doped, but a second diffusion layer 105 a delta-doped with p-type impurities is formed near the interface with the channel layer 104. .
- the impurity concentration in each of the first and second diffusion layers 103a and 105a is 1 ⁇ 10 12 to 1 ⁇ 10 13 cm ⁇ 2 .
- the first and second diffusion layers 103a and 105a and the channel layer 104 are arranged at a predetermined interval. That is, there is a barrier between each diffusion layer 103a, 105a and the channel layer 104.
- the non-assisted caro regions 103b and 105b of a part of the layer are arranged.
- the thickness between each of the diffusion layers 103a and 105a and the channel layer 104 that is, the layer thickness of the non-doped regions 103b and 105b is, for example, 10 nm or more and 100 nm or less.
- a common electrode 111 made of metal is formed, and this electrode 111 is grounded.
- the upper surface of the semiconductor stacked body S i.e. on the second barrier layer 105 is formed with an insulating layer 106 made of S i 0 2, 3 two electrodes are formed on the upper surface thereof. That is, a gate electrode 109 is formed in the center of the insulating layer 106, and a source electrode 107 and a drain electrode 108 are formed on both sides of the insulating layer 106 with the gate electrode 109 interposed therebetween.
- both the source electrode 107 and the drain electrode 108 make electrical ohmic contact with the channel layer 104.
- the insulating layer 106 may be formed of 3 iN, and its thickness varies depending on the characteristics of the device, but is preferably, for example, 20 nm or more and 100 nm or less.
- the upper surface of the I n P layer 102 in the semiconductor laminate S, and the side surface of the portion formed mesa, and the protective insulating layer 110 consisting of S i 0 2 is formed, by connexion semiconductor laminated thereto Body S is insulated from the surroundings.
- FIG. 2 shows the band structure near the channel layer in this switching element.
- the band gap of the channel layer 104 is smaller than that of the first barrier layer 103 and that of the second barrier layer 105, thereby forming a band offset. Then, electric charges supplied from the first and second diffusion layers 103a and 105a accumulate at the boundaries between the first and second barrier layers 103 and 105 and the channel layer 104, respectively. Distribution is formed. That is, since the first diffusion layer 103 a is doped with an n-type impurity, the electrons in this part are transferred to the conduction band E at the boundary between the first barrier layer 103 and the channel layer 104. It is accumulated in c and forms a two-dimensional electron gas (also called "two-dimensional electron fluid”) EG.
- two-dimensional electron fluid also called "two-dimensional electron fluid"
- the second diffusion layer 105a is doped with a p-type impurity, Are offset at the boundary between the second barrier layer 105 and the channel layer 104 and accumulate in the valence band E v to form a two-dimensional hole gas (also called “two-dimensional hole fluid”) HG. ing. Charge density of two-dimensional electron gas EG and hole gas HG is substantially corresponds to the addition density of impurities, both of which become 1X 10 12 ⁇ 1X10 13 C ⁇ 2 .
- the Fermi level E F is an electron chemical potential is the energy of the electron distribution function is 0.5.
- a signal having a frequency of 10 GHz or more and 1000 GHz or less is applied to the source electrode 107.
- the two-dimensional electron gas EG and the two-dimensional hole gas HG have a high-density charge accumulated in two dimensions, when a high-frequency signal is applied, the two-dimensional electron gas EG and the two-dimensional hole gas HG Since the gas HG and the source electrode 107 are electrostatically coupled, plasma oscillation occurs in each of the two-dimensional electron gas EG and the hole gas HG.
- the plasma vibrations of the two are easily coupled and propagated while being stably coupled. It is supposed to. Note that no charge transfer exceeding the phase velocity of the plasma oscillation occurs in the channel layer 104, so that the two-fluid instability does not occur. Also, since the drain electrode 108 is also electrostatically coupled to the two-dimensional electron gas EG and the two-dimensional hole gas HG, the plasma vibration propagated from the source electrode 107 side as described above is output from the drain electrode 108 .
- the charge density below the gate electrode 109 changes.
- a negative voltage is applied to the gate electrode 109
- the charge density of both electrons and holes decreases, and the accumulated charge immediately below the gate electrode eventually becomes zero.
- the two-dimensional electron gas EG and the hole gas HG in the channel layer 104 are separated on the left and right sides of the gate electrode 109, so that the plasma oscillation propagating from the source electrode 109 cannot reach the drain electrode. I Therefore, by changing the voltage applied to the gate electrode 109 in this way, the propagation efficiency of the plasma vibration directly below the gate electrode 109 can be changed, and thus the modulation element for intensity-modulating the high-frequency vibration This element can function as.
- the gate electrode 109 receives a DC voltage or a signal having a frequency of about 100 to 1/10000 of the frequency of the signal applied to the source electrode 109. It is preferable to input.
- the channel layer 104 having a narrow band gap is formed into the barrier layers 103 and 105 having the diffusion layers 103 a and 105 a doped with impurities.
- the two-dimensional electron gas EG and the two-dimensional hole gas HG are formed in the band offset part.
- a high-frequency signal is applied to the source electrode 109 that is electrostatically coupled to the electron gas EG and the hole gas HG.
- plasma vibration is generated in each of the electron gas EG and the hole gas HG, and these vibrations are combined and propagated, so that high-frequency signals can be transmitted.
- the high-frequency signal is not limited by the saturation speed of the electrons and holes. Can be transmitted.
- the potential on the upper surface of the semiconductor laminate S decreases. Due to this, the charge density of the channel layer 104 can be changed by changing the potential on the upper surface of the semiconductor laminate S. Therefore, the potentials of the source electrode 107 and the drain electrode 108 provided above the element When a high-frequency signal is applied to the source electrode 107, the input signal propagates through the channel layer 104 as plasma oscillation and is transmitted from the drain electrode 108. Can be output.
- the electrodes 107 to 109 are formed on the same insulating layer 106.
- the present invention is not limited to this. It can also be changed depending on the part where is formed. For example, below the source electrode 107 and the drain electrode 108 where input / output of high-frequency signals is performed, it is preferable to reduce the thickness of the insulating layer 106 in order to make signal input / output effective. .
- the thickness of the insulating layer 106 can be larger than that of the insulating layer below the source electrode 107.
- the electrodes 107 to L09 are formed on the second barrier layer 105 via the insulating layer 106 as described above. Can be connected so as to form a Schottky junction. These changes can be applied to a second embodiment described later.
- the materials constituting the barrier layers 103 and 105 and the channel layer 104 are not limited to those described in the above description. In other words, it is only necessary to be composed of an m-V group compound semiconductor, and not only a binary material but also a ternary, quaternary, or quinary mixed crystal material can be used. Further, it is preferable that the channel layer 104 contain In because the band gap can be narrowed.
- GaInNas containing N is used in the channel layer 104, but the following effects can be obtained by containing N in this way.
- the effective mass of an electron is much smaller than the effective mass of a hole (hole), which causes the electron mobility to be much larger than the mobility of a hole.
- the signal frequency is high and the signal wavelength is short with respect to the distance between the source and the drain, if the mobilities of the electrons and holes differ greatly as described above, the phase of the plasma oscillation is shifted during propagation. The bond may be broken.
- N is added as described above, the effective mass of electrons can be increased, whereby the mobility of electrons can be reduced.
- the effective mass of electrons when N is added to Ga As is shown.
- the following table shows the values of X in GaN x As t _ x, i.e. the electron effective mass in the case of varying the composition ratio of N.
- increasing the composition ratio of N is preferable because the effective mass of electrons increases.
- the introduction of N, a group V element has a large effect on the conduction band, but has a small effect on the valence band, so the effective mass of the hole (about 0.62) does not change much.
- the N addition limit was about 0.1. At this time, about 0.07 was the upper limit in order to keep good crystallinity.
- the composition ratio of N containing N and As that is, the value of X when expressed as N x As x , is 0 or more and 0.1 or less. And more preferably 0.01 or more and 0.07 or less, particularly preferably 0.02 or more and 0.05 or less.
- the effective mass means a relative weight with respect to the weight of electrons in a vacuum.
- the semiconductor mixed crystal forming the channel layer 104 is
- composition of the channel layer on the GaAs substrate is as follows:
- FIG. 3 is a cross-sectional view of the plasma vibration switching element according to the present embodiment.
- the difference between the plasma oscillation switching element and the first embodiment is the configuration of the electrodes, and the configurations of the substrate and the laminate are the same as those of the first embodiment. Omitted.
- an insulating layer 106 is provided on the upper surface of the second barrier layer 105, and the insulating layer 106 is disposed on both sides of the barrier layer 105 so as to sandwich the insulating layer 106.
- a pair of contact layers 112 are formed.
- a first source electrode 107, a gate electrode 109, and a first drain electrode 108 having the same configuration as described in the first embodiment are formed.
- a second source electrode 113 is formed on the contact layer 112 adjacent to the first source electrode 107, and a contact layer 112 adjacent to the first drain electrode 108 is formed.
- a second drain electrode 114 is formed thereon.
- the contact layer 112 can be formed of, for example, InGaAs to which a p-type impurity is added at a high concentration, whereby the second source electrode 113 and the drain electrode 113 can be formed. 4 has ohmic contact with the second barrier layer 105 and the two-dimensional hole gas HG.
- a high-frequency signal is input to the first source electrode 107, and a DC voltage or a relatively low-frequency signal is applied to the gate electrode 109.
- a DC voltage or a relatively low-frequency signal is applied to the gate electrode 109.
- the two-dimensional hole gas HG Has ohmic contact with Therefore, for example, when a voltage Q is applied so that the second drain electrode 114 becomes positive, in the two-dimensional hole gas HG, the hole becomes second from the second drain electrode 114 side. Will move to the source electrode 113 side. On the other hand, the electrons in the two-dimensional electron gas EG do not move.
- the wavelength of the plasma oscillation changes due to the Doppler effect. That is, as shown in Fig. 4, the two-dimensional hole gas HG Since the holes flow in the direction opposite to the propagation direction, the wavelength of vibration becomes shorter. On the other hand, the wavelength of the plasma oscillation of the two-dimensional electron gas EG does not change. Thus, the phase of the plasma oscillation generated by each gas shifts as the signal propagates, and when the amount of the deviation coincides with the wavelength (for example, on the line K), the two oscillations recombine.
- the drain electrode 108 only the frequency signal of the wavelength that matches the phase change amount between the source and the drain is selectively emphasized and output. Other signals are suppressed by the phase shift of the plasma oscillation.
- the second source electrode 113 and the drain electrode to which a DC voltage is applied are located between the first source electrode 107 and the drain electrode 108. 1 1 4 is provided. Since the wavelength of each plasma oscillation can be changed by the DC current flowing between the electrodes, only a frequency signal having a wavelength that matches the phase change amount can be extracted. That is, the plasma oscillation switching element according to the present embodiment can function as a filter that can extract an arbitrary frequency signal. At this time, since the amount of phase shift changes depending on the amount of current between the second source electrode 113 and the drain electrode 114, a signal of an arbitrary frequency can be extracted. As described above, in order for the present element to function as a filter, the gate electrode 109 can be omitted, thereby simplifying the structure and facilitating the manufacture.
- the second source / drain electrodes 113 and 114 are in ohmic contact with the two-dimensional hole gas HG via the second barrier layer 105.
- the second source / drain electrodes 113 and 114 may be extended to a mesa-shaped slope, or a part of the first barrier layer 103 may be exposed below the mesa, and
- the second source / drain electrodes 113 and 114 can be extended. Although this slightly complicates the manufacturing process, the second source / drain electrodes 113 and 114 are not only connected to the two-dimensional hole gas HG but also to the second barrier layer 103 via the first barrier layer 103. Ohmic contact with the electron gas EG is also possible.
- the second source • When a current flows between the drain electrodes 113 and 114, electrons and holes move in both the two-dimensional electron gas EG and the two-dimensional hole gas HG. Also in this case, since the moving directions of the electrons and the holes are opposite, a phase shift occurs, so that the same effect as in the above embodiment can be obtained.
- the third source electrode 115 and the third drain electrode 116 can be provided independently of the second source / drain electrodes 113 and 114. This further complicates the manufacturing process.
- the amount of hole movement in the two-dimensional hole gas HG and the amount of electron movement in the two-dimensional electron gas EG are independently set to the second source / drain electrodes 113 and 114. The control can be performed using the third source / drain electrodes 115 and 116.
- one of the second source / drain electrodes 113 and 114 is connected to the ground or the power supply voltage so as to be short-circuited in an AC manner so that the current is constant at the other electrode.
- By controlling and releasing AC it is possible to perform signal amplification and oscillation operation.
- an element in which the third source 'drain electrode 115, 116 is provided independently of the second source' drain electrode 113, 114 can be used. In this case, by flowing currents in the opposite directions between the second source / drain electrodes 113 and 114 and the third source / drain electrodes, the moving directions of the electrons and the holes can be matched. It is particularly desirable because it is possible to obtain gains in both cases.
- the second (and third) source-drain electrodes 113 and 114 are two boundaries for plasma oscillation, and the AC short-circuit electrode is a fixed end for plasma oscillation.
- the AC open electrode is the free end.
- a standing wave of plasma oscillation corresponding to the spread size of the electron gas (or hole gas) is generated, and can resonate with an electric signal (or electromagnetic wave) of a corresponding frequency.
- the resonance frequency depends on the propagation speed of the plasma oscillation, which is determined by the charge density, and can be modulated by changing the gate voltage.
- Electrons (or holes) move in this element in the direction from the fixed end to the free end, and a current is applied so that the velocity does not exceed the propagation speed of the plasma oscillation. Then, for the traveling wave from the fixed end to the free end, it behaves as if the free end boundary is apparently opposite, and as a result, the reflectivity at the free end becomes a complex value whose absolute value exceeds 1. . Also, for the traveling wave in the opposite direction (reflected wave at the free end), the fixed end behaves as if it were receding, but the velocity of the electrons (or holes) is slower than the traveling velocity of the traveling wave, Catch up and be reflected again.
- the traveling wave can be multiply reflected between the left and right boundaries, and its amplitude is amplified each time it is reflected at the free end of the force.
- the movement of electrons (or holes) serving as the medium causes the imaginary component of the eigenvalue of the resonator frequency to become positive, resulting in an unstable mode in which the amplitude increases with time.
- the amplitude of the traveling wave increases as the reflection is repeated in the resonator, but the element gain, which determines the upper limit, is limited by reflection loss at each boundary, phase scattering and energy scattering in the resonator, etc. , Take a finite value.
- the second (and third) source electrode 113 is fixed, the second drain electrode 114 is free, and the second drain electrode 113 is connected to the second drain electrode 113 from the second source electrode 113 side.
- a direct current is applied so that electrons (and holes) move to the electrode 114 side, and an electric signal having an appropriate frequency is introduced to the first source electrode 107, thereby forming the first drain electrode.
- the amplified signal is output from 108. That is, it operates as an amplifier. It also operates as an oscillator by feeding back part of the output signal to the input side. By changing the gate voltage, the frequency of resonance (amplification / oscillation) can be modulated.
- the two-dimensional electron gas EG and the two-dimensional hole gas HG coupled to each other use the first source electrode 107 and the drain electrode 108 coupled to each other to transmit a high-frequency signal.
- Easier input / output by using a configuration that performs input / output, and a configuration that supplies DC current using independent second source / drain electrodes 113, 114 (and third source / drain electrodes)
- the signal and the plasma oscillation can be combined.
- FIG. 6 is a schematic configuration diagram of the high-frequency modulation device according to the present embodiment.
- this high-frequency modulation device includes the plasma oscillation switching element 10, the input matching circuit 20, and the high-frequency signal generator 30 shown in the first embodiment. Further, an input section 41 for inputting the modulation signal to the input matching circuit 20 is provided, and an output section 42 is provided for the drain electrode 108 of the switching element 10.
- the input matching circuit 20 is connected to the gate electrode 109 of the switching element 10, and the high-frequency generator 30 is connected to the source electrode 107.
- the device configured as described above operates as follows. That is, a high-frequency signal Sa of about 1000 GHz generated by the high-frequency signal generator 30 is input to the switching element 10.
- the modulation signal Sb input from the input unit 41 is impedance-matched in the input matching circuit 20 and is input to the gate electrode 109 of the switching element 10.
- a signal in a high frequency region propagates from the source electrode 107 to the drain electrode 109, and this signal is controlled by the gate voltage. You. Therefore, the high-frequency signal Sa input to the source electrode 107 as described above is modulated by the modulation signal Sb input to the gate electrode 109 and output from the drain electrode 108.
- the plasma oscillation switching element used in the first embodiment by using the plasma oscillation switching element used in the first embodiment, it is possible to realize a modulation device that operates in a high frequency region with a simple configuration.
- the modulated high-frequency signal Sc can be radiated to the outside as an output electromagnetic wave. Therefore, the present modulation device can be used as a transmitter using electromagnetic waves in a high-frequency region.
- an impedance matching device can be further provided between the switching element 10 and the antenna, and an amplifying device can be provided in the input unit 41 and the output unit 42.
- the plasma oscillation switching element according to the first embodiment is used, but the plasma oscillation switching element according to the second embodiment is used. Needless to say, it can be done.
- the substrate 101 of the plasma oscillation switching element may be formed of a material other than InP.
- the substrate 101 may be formed of a semi-insulating mv group compound semiconductor. Or it may be formed of an insulating substrate such as A 1 2 ⁇ 3.
- the capacitance of the switching element is reduced, so that high-frequency characteristics can be improved.
- the n-type diffusion layer 103a is formed in the first barrier layer 103, and the p-type diffusion layer 105a is formed in the second barrier layer 105. It may be. That is, the first barrier layer 103! ) -Type diffusion layer, and an n-type diffusion layer may be formed in the second barrier layer 105. Further, in each of the above embodiments, as shown in FIG. 2, the material for forming each layer is selected such that the band gap of the channel layer 104 is smaller than the band gap of the first and second barrier layers 103 and 105. However, the present invention is not limited to this.
- an offset portion for accumulating the two-dimensional electron gas EG and the hole gas HG may be formed at the boundary between each barrier layer 103, 105 and the channel layer 104.
- the energy (potential for electrons) at the conduction band edge of the barrier layer having the n-type diffusion layer is larger than the energy at the conduction band edge of the channel layer, and the energy at the valence band edge of the barrier layer having the p-type diffusion layer is large. It is only necessary that the energy be smaller than the energy at the valence band edge of the channel layer.
- the formed band offset is preferably 0.1 eV or more and 1.0 eV or less.
- the diffusion layers in which impurities are added to the barrier layers 103 and 105 by delta doping are formed.
- a non-doped region 103b and 105b having a predetermined thickness is formed between the channel layer 104 and the diffusion layers 103a and 105a.
- Impurities may be added to all other parts.
- impurities may be added to all of the barrier layers 103 and 105. This facilitates manufacturing.
- the undoped layers 103b and 105 at predetermined intervals are provided between the channel layer 104 and the diffusion layers 103a and 105a.
- the position at which the common electrode is provided is not limited to this part, and the substrate 101 and the It can be provided in the region 102 between the first barrier layer 103 and the first barrier layer 103.
- a common electrode may be provided on the substrate 101 by adding impurities.
- an electrode which is in ohmic contact with at least one of the two-dimensional electron gas and the hole gas may be provided and used as a common electrode.
- such an independent common electrode is not always necessary, and the gate electrode 109 can be used as a common electrode.
- a plasma oscillation switching element capable of realizing a reliable operation in a high frequency region.
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- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Chemical & Material Sciences (AREA)
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- Junction Field-Effect Transistors (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003266701A AU2003266701A1 (en) | 2002-10-09 | 2003-09-30 | Plasma oscillation switching device |
JP2004542817A JP3661061B2 (ja) | 2002-10-09 | 2003-09-30 | プラズマ振動スイッチング素子 |
US10/745,567 US6953954B2 (en) | 2002-10-09 | 2003-12-29 | Plasma oscillation switching device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-296220 | 2002-10-09 | ||
JP2002296220 | 2002-10-09 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/745,567 Continuation US6953954B2 (en) | 2002-10-09 | 2003-12-29 | Plasma oscillation switching device |
Publications (2)
Publication Number | Publication Date |
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WO2004034475A1 true WO2004034475A1 (ja) | 2004-04-22 |
WO2004034475A8 WO2004034475A8 (ja) | 2004-05-13 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/012469 WO2004034475A1 (ja) | 2002-10-09 | 2003-09-30 | プラズマ振動スイッチング素子 |
Country Status (5)
Country | Link |
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US (1) | US6953954B2 (ja) |
JP (1) | JP3661061B2 (ja) |
CN (1) | CN1332453C (ja) |
AU (1) | AU2003266701A1 (ja) |
WO (1) | WO2004034475A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007134607A (ja) * | 2005-11-11 | 2007-05-31 | National Institute Of Advanced Industrial & Technology | 半導体素子 |
JP2013219327A (ja) * | 2012-02-03 | 2013-10-24 | Semiconductor Energy Lab Co Ltd | 半導体装置 |
EP2599126B1 (en) * | 2010-07-28 | 2021-03-03 | The University Of Sheffield | Schottky diode with 2deg and 2dhg |
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TWI301699B (en) * | 2005-10-18 | 2008-10-01 | Sunplus Technology Co Ltd | Transmitting circuit, receiving circuit, interface switching module and interface switching method for sata and sas interface |
US7408208B2 (en) * | 2006-03-20 | 2008-08-05 | International Rectifier Corporation | III-nitride power semiconductor device |
US8324661B2 (en) * | 2009-12-23 | 2012-12-04 | Intel Corporation | Quantum well transistors with remote counter doping |
JP5079143B2 (ja) * | 2010-06-24 | 2012-11-21 | ザ・ユニバーシティ・オブ・シェフィールド | 半導体素子、電界効果トランジスタおよびダイオード |
JP5765147B2 (ja) * | 2011-09-01 | 2015-08-19 | 富士通株式会社 | 半導体装置 |
US8614447B2 (en) | 2012-01-30 | 2013-12-24 | International Business Machines Corporation | Semiconductor substrates using bandgap material between III-V channel material and insulator layer |
JP5985282B2 (ja) * | 2012-07-12 | 2016-09-06 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
TWI496285B (zh) * | 2012-12-07 | 2015-08-11 | Richtek Technology Corp | 高電子遷移率電晶體及其製造方法 |
US11380806B2 (en) | 2017-09-28 | 2022-07-05 | Intel Corporation | Variable capacitance device with multiple two-dimensional electron gas (2DEG) layers |
TWI801671B (zh) * | 2019-10-01 | 2023-05-11 | 聯華電子股份有限公司 | 高電子遷移率電晶體及其製作方法 |
US20240162338A1 (en) * | 2022-11-04 | 2024-05-16 | Mitsubishi Electric Research Laboratories, Inc. | Semiconductor Device with a Changeable Polarization Direction |
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2003
- 2003-09-30 CN CNB038096463A patent/CN1332453C/zh not_active Expired - Fee Related
- 2003-09-30 JP JP2004542817A patent/JP3661061B2/ja not_active Expired - Fee Related
- 2003-09-30 AU AU2003266701A patent/AU2003266701A1/en not_active Abandoned
- 2003-09-30 WO PCT/JP2003/012469 patent/WO2004034475A1/ja active Application Filing
- 2003-12-29 US US10/745,567 patent/US6953954B2/en not_active Expired - Fee Related
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007134607A (ja) * | 2005-11-11 | 2007-05-31 | National Institute Of Advanced Industrial & Technology | 半導体素子 |
EP2599126B1 (en) * | 2010-07-28 | 2021-03-03 | The University Of Sheffield | Schottky diode with 2deg and 2dhg |
JP2013219327A (ja) * | 2012-02-03 | 2013-10-24 | Semiconductor Energy Lab Co Ltd | 半導体装置 |
Also Published As
Publication number | Publication date |
---|---|
AU2003266701A1 (en) | 2004-05-04 |
CN1650436A (zh) | 2005-08-03 |
JPWO2004034475A1 (ja) | 2006-02-09 |
US20040135169A1 (en) | 2004-07-15 |
CN1332453C (zh) | 2007-08-15 |
JP3661061B2 (ja) | 2005-06-15 |
US6953954B2 (en) | 2005-10-11 |
WO2004034475A8 (ja) | 2004-05-13 |
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