WO2016088952A1 - 광전도 반도체 스위치 및 그 스위치의 제조방법 - Google Patents
광전도 반도체 스위치 및 그 스위치의 제조방법 Download PDFInfo
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- WO2016088952A1 WO2016088952A1 PCT/KR2015/004289 KR2015004289W WO2016088952A1 WO 2016088952 A1 WO2016088952 A1 WO 2016088952A1 KR 2015004289 W KR2015004289 W KR 2015004289W WO 2016088952 A1 WO2016088952 A1 WO 2016088952A1
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
- H01L31/10—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors characterised by potential barriers, e.g. phototransistors
- H01L31/101—Devices sensitive to infrared, visible or ultraviolet radiation
- H01L31/102—Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier
- H01L31/107—Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier the potential barrier working in avalanche mode, e.g. avalanche photodiodes
- H01L31/1075—Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier the potential barrier working in avalanche mode, e.g. avalanche photodiodes in which the active layers, e.g. absorption or multiplication layers, form an heterostructure, e.g. SAM structure
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- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0256—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by the material
- H01L31/0264—Inorganic materials
- H01L31/0304—Inorganic materials including, apart from doping materials or other impurities, only AIIIBV compounds
- H01L31/03046—Inorganic materials including, apart from doping materials or other impurities, only AIIIBV compounds including ternary or quaternary compounds, e.g. GaAlAs, InGaAs, InGaAsP
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- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0352—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions
- H01L31/035272—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions characterised by at least one potential jump barrier or surface barrier
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- H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
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- H01L31/101—Devices sensitive to infrared, visible or ultraviolet radiation
- H01L31/102—Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier
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- H—ELECTRICITY
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- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/184—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof the active layers comprising only AIIIBV compounds, e.g. GaAs, InP
- H01L31/1844—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof the active layers comprising only AIIIBV compounds, e.g. GaAs, InP comprising ternary or quaternary compounds, e.g. Ga Al As, In Ga As P
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- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/544—Solar cells from Group III-V materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S977/752—Multi-walled
Definitions
- the present invention relates to a photoconductive semiconductor switch, and more particularly, to a photoconductive semiconductor switch capable of reliable operation even in an extreme environment exemplified by high voltage and high output, and a method of manufacturing the switch.
- a photoconductive semiconductor switch is a device that converts an optical signal into an electrical signal.
- an electromagnetic wave is generated by converting an optical signal in the form of a pulse into an electrical signal in the ultra high frequency and THz (terahertz) frequency bands. Can be used.
- the photoconductive semiconductor switch operates as follows. First, photons incident from the outside are absorbed by the semiconductor layer to generate electron / hole pairs.
- the electron / hole pair is not only separated by an electric field formed in the semiconductor by a voltage applied from the outside, but also accelerated to have a high kinetic energy, and redundant regeneration of a carrier, for example, avlanch multiplication may occur.
- the separated electron / hole pair is collected on two electrodes. This operation can be understood as the result that external light is converted into an electric signal and generates electromagnetic waves.
- the photoconductive semiconductor switch in order to form very short electrical pulses through fast electrical response, the mobility of electrons and holes of the semiconductor must be large, and the carrier lifetime must be short. The mobility of the carrier determines the rising time of the pulse, and the carrier's life time determines the falling time.
- the photoconductive semiconductor switch in order for the photoconductive semiconductor switch to switch at high power, a high resistance must be prevented from flowing in the absence of incident light, and if there is incident light, the electron / hole pair generated by the photons is The resistance must be sufficiently reduced in the entire path of the flowing current.
- the difference in resistance between light and no light is one of the most important performance indicators of a photoconductive semiconductor switch operating at high voltage and high power.
- the resistance of the photoconductive semiconductor switch is in the absence of the incident light. It should be above (giga ⁇ ) to suppress the current to a very low level.
- the semiconductor of the photoconductive semiconductor switch preferably has the property of an insulator in the absence of incident light.
- the maximum allowable voltage of the photoconductive semiconductor switch may be influenced by the intensity of the maximum allowable electric field of the semiconductor and the gap between two electrodes provided in the photoconductive semiconductor switch.
- the more realistic influence on the maximum allowable voltage is due to deterioration due to current filaments formed around the electrode, semiconductor breakdown, and flashover on the semiconductor surface when a high current flows in the photoconductive semiconductor switch. Deterioration of the device. Due to this limiting factor, the operating voltage of the photoconductive semiconductor switch is determined at a voltage much lower than the dielectric breakdown voltage of the theoretical semiconductor. In other words, the maximum allowable voltage of the photoconductive semiconductor switch is limited by device degradation due to breakdown or flashover around the electrode or on the semiconductor surface.
- a device structure or a process capable of suppressing a flashover on a surface and a current filament formed around an electrode may be required.
- FIG. 5 is a cross-sectional view of a conventional photoconductive semiconductor switch, in which an vicinity of one electrode is enlarged.
- the resistance of the edge of the electrode and the bottom of the electrode is very large because the electrode prevents incident light incident on the semiconductor. Therefore, device degradation mainly starts at the edge of the electrode and just under the electrode.
- Such a photoconductive semiconductor switch operating in a light gain voltage region is referred to as a nonlinear photoconductive semiconductor switch.
- the present invention is proposed under the background described above, and proposes a photoconductive semiconductor switch and a method of manufacturing the switch that can operate stably even at high voltage and high output.
- a photoconductive semiconductor switch comprises: a semiconductor substrate generating electrons and holes by incident light; A pair of conductive layers provided at two spaced apart points on the semiconductor substrate and having low resistance by abundant carriers; And a pair of electrodes in contact with the pair of conductive layers, respectively. According to this, the use range of the photoconductive semiconductor switch can be extended.
- At least one of the pair of conductive layers may have a ridge portion that extends further from the electrodes in a direction facing each other to lower the resistance at the contact portion of the electrode, and the ridge portion may be formed on the pair of conductive layers. More preferably, it is provided.
- the distance between the pair of electrodes is more preferably 10 to 500 times the length of the ridge portion, the distance between the pair of electrodes is 0.1 ⁇ 5mm, the length of the ridge portion may be provided in 10um ⁇ 0.1mm. .
- the conductive layer may have a larger band gap than the semiconductor substrate, the electrode may provide ohmic contact, and the electrode may be provided with a boundary line continuously to prevent concentration of current. As a result, the resistance at the edge of the electrode can be lowered to prevent concentration of the electric field.
- the semiconductor substrate is a GaAs substrate
- the conductive layer is preferably any material selected from GaAs, InGaP, and AlGaAsP, and in the case where the conductive layer is GaAs,
- An etch stop layer is provided, and a material selected from AlAs and InP is preferably used as the etch stop layer, and more preferably, an undoped buffer layer is stacked on the semiconductor substrate.
- the at least one pair of conductive layers may be provided together on one side of the semiconductor substrate, or may be provided in pairs on both sides of the semiconductor substrate, and the electrodes may be respectively provided on the upper side of the conductive layer.
- the electrode may be any electrode above the semiconductor substrate or any electrode below the semiconductor substrate.
- at least two electrodes may be provided on the upper side of the semiconductor substrate, at least two on the lower side of the semiconductor substrate, and electrodes which are far from each other may be used in pairs. have.
- the photoconductive semiconductor switch according to the second aspect of the present invention is a photoconductive semiconductor switch for converting an optical signal in the form of a pulse into an electrical signal in an ultrahigh frequency band including terahertz, the lower electrode of a pair of spaced apart electrodes A pair of doped conductive layers that extend further outward, including edge portions of the pair of conductive layers, wherein the pair of conductive layers further extend from the pair of electrodes in a direction facing each other It is characterized by having a ridge portion.
- the electrode is a square, the vertex of the electrode is preferably provided round.
- a method of manufacturing a photoconductive semiconductor switch comprising: growing a conductive layer on a semi-insulating semiconductor substrate that generates an electron hole pair by photons; Providing a pair of electrodes to the conductive layer; And etching the conductive layer to have a ridge portion in a shape larger than that of the pair of electrodes by using a mask larger than the electrode.
- the ridge portion further extends from the electrode in a direction in which the pair of electrodes face each other, and before the growth of the conductive layer, a process of growing a buffer layer and an etch stop layer is further performed.
- the etch stop layer and the etching solution or the etching chemical of the conductive layer may be provided differently, the electrode is preferably provided with a vertex round, after etching the conductive layer, to form a protective film, Preferably, a step of exposing the pair of electrodes is further included.
- FIG. 1 is a perspective view of a photoconductive semiconductor switch according to an embodiment.
- FIG. 2 is a cross-sectional view of a photoconductive semiconductor switch according to the embodiment.
- FIG. 3 is a flowchart of a method of manufacturing a photoconductive semiconductor switch in accordance with an embodiment.
- FIG. 4 is a perspective view of a photoconductive semiconductor switch in accordance with another embodiment.
- Fig. 5 is a sectional view of a conventional photoconductive semiconductor switch, in which an vicinity of one electrode is enlarged.
- FIG. 1 is a perspective view of a photoconductive semiconductor switch according to an embodiment
- FIG. 2 is a cross-sectional view of a photoconductive semiconductor switch according to the embodiment.
- the photoconductive semiconductor switch includes a semiconductor substrate 1, a buffer layer 2 provided above the semiconductor substrate 1, and at least spaced apart from each other above the buffer layer 2.
- An etch stop layer 3 provided at two places, a conductive conductive layer 4 provided above the etch stop layer 3, and an electrode provided at at least one portion of the conductive layer 4 ( 5) is included.
- the conductive layer 4 may include a plurality of electrons or holes even when there is no incident light. Therefore, the high resistance of the edge and the bottom of the electrode 5 and the problems caused by the conductive layer 4 can be partially solved.
- a semi-insulating substrate having a low conductivity of very high quality may be preferably used.
- donors or acceptors can be implanted at the deep level through Fe doping.
- the semi-insulating substrate can be fabricated by compensating unintentionally shallowly doped levels of donors or acceptors.
- the vertex portion of the electrode 5 is provided rounded, ie rounded.
- the chamfer is provided so that concentration of charge does not occur.
- the electrode has a very clean and continuous interface so that there is no deflection of electrons or holes.
- the electrode is a quadrangular shape as a whole, the corner portion is formed rounded.
- the vertices of the pair of electrodes facing each other are provided in a round shape.
- the electrode 5 may be provided with various types of electrodes such as AuGe / Ni / Au, Pd / Ni / Au, and the like to provide ohmic contact.
- the conductive layer 4 is doped n-type or p-type, so the resistance is low. In particular, it is very low compared to the substrate 1. If the conductive layer 4 is absent, there is no electron-hole pair because no incident light reaches the semiconductor layer immediately below the electrode forming direct ohmic contact. Therefore, the resistance is larger than the area between the two electrodes. Thus, high resistance occurs at the bottom of the electrode or at the edge of the electrode, resulting in a failure, which acts as a limitation of voltage and output.
- the conductive layer 4 GaAs or InGaP or AlGaAs doped with n-type or p-type may be used. N + GaAs or n + InGaP may be applied for manufacturing convenience.
- the conductive layer 4 may provide the ridge portion 41 as a ridge structure.
- the ridge portion 41 may further extend in a direction facing each other in the pair of electrodes 5. According to this, the high resistance at the edge of the electrode 5 can be further lowered and can respond more actively to high voltage and high output.
- the conductive layer 4 may be formed to have a structure in which light absorption is less than that of the substrate 1 using a material having a higher band gap than the substrate 1. This allows the incident light to reach the substrate 1 without being absorbed by the conductive layer 4 so that photons can play a role of providing electrons and holes, and abundant carriers exist in the ridge portion 41 to provide resistance. This is because the low state does not require the role of a photon. If the thickness of the conductive layer 4 is about 100nm ⁇ 1um may serve to provide a carrier, but is not limited thereto.
- the length Lw of the ridge portion 41 has a very short length compared to the distance d between two electrodes of the photoconductive semiconductor switch.
- the distance d between the electrodes may be about 0.1 mm to about 5 mm, and the length Lw of the ridge portion 41 may be about 10 ⁇ m to about 0.1 mm to perform a sufficient function.
- the distance d between the electrodes may be provided at a rate of about 10 to 500 times the length Lw of the ridge portion.
- the conductive layer 41 having the ridge portion 41 as can be seen in the above description, it is possible to maintain a low resistance even if the incident light does not reach the immediately and / or the edge of the electrode 5, and thus is provided with metal.
- the high resistance region formed near the electrode 5 can be eliminated, so that the breakdown voltage of the photoconductive semiconductor switch can be increased. This is applied to a photoconductive semiconductor switch to which high power and high voltage are applied, which can be used in various applications.
- the conductive layer 4 is doped with p-type or n-type, it is also easy to form ohmic contact with the ohmic metal, which may help to improve the characteristics of the photoconductive semiconductor switch element.
- the buffer layer 2 may be provided above the substrate 1.
- the buffer layer 2 may be provided for the protection of the substrate 1 and for crystal growth without defects.
- Undoped GaAs may be used as the buffer layer 2.
- An etch stop layer 3 may be provided between the buffer layer 2 and the conductive layer 4.
- the etch stop layer 3 may be provided to selectively etch only the conductive layer 4 when etching to provide the ridge portion 41. That is, the buffer layer 2, the etch stop layer 3, the conductive layer 4, and the electrode 5 are provided on the substrate 1, and then the conductive layer 4 is etched to form the ridge portion 41. When providing, it has the purpose of etching out only the conductive layer 4.
- the etch stop layer may be applied when the material of the conductive layer 4 is provided as GaAs and the etching ratio is similar to that of the buffer layer and the substrate layer. When the GaAs is used as the material of the conductive layer 4, the etch stop layer 3 is used. ) May be AlAs, AlGaAs, InGaP or InP. Since the etching ratio is different when the conductive layer 4 is provided with InGaP or AlGaAs, the etch stop layer 3 may not be provided.
- the buffer layer 2 and the etch stop layer 3 are not necessarily provided. However, it is of course more preferable to provide for the convenience of the process, the performance improvement, and the yield increase.
- the incident light is irradiated to the upper side, that is, the upper surface on which the electrode is provided with reference to the drawings.
- the lower side that is, the lower surface on which the semiconductor substrate 1 is provided.
- the semiconductor substrate 1 located below the electrode 5 is not conducive to the formation of electrons and holes because the electrode has a property of reflecting the incident light.
- the incident light is irradiated onto the upper surface, the incident light is reflected by the electrode 5 provided as metal, so that the incident light does not reach the semiconductor substrate 1 of the electrode 5 and thus, the formation of electrons and holes It does not work and leads to light loss.
- the incident light is irradiated to the lower surface so that no incident light is reflected by the electrode 5, and even though reflected, the incident light is incident on the semiconductor substrate 1 to aid in the generation of electrons and holes. Is more desirable. As a result, not only the efficiency of incident light can be increased, but also a high output voltage can be realized by lowering a resistance directly under the electrode 5.
- the incident light is preferably irradiated not only to the semiconductor substrate 1 located between the electrodes 5 but also to a portion where the electrode 5 is located and a portion where the ridge portion 41 is located.
- the incident light is a laser
- the current pulse and the voltage pulse generated in the photoconductive semiconductor switch can be provided with the narrowest and the largest size. As a result, the resistance directly under the electrode 5 can be lowered, and a high output voltage can be realized.
- FIG. 3 is a flowchart illustrating a method of manufacturing the photoconductive semiconductor switch according to the embodiment.
- the photoconductive semiconductor switch is roughly divided into a step (S1) of growing each film constituting an element, a ridge providing step (S2) of providing a ridge portion 41, and a post-processing of the switch element.
- Step (S3) is included.
- the film forming process (S1) is carried out in the following process.
- undoped GaAs is grown as a buffer layer 2 on the semi-insulated substrate (S11).
- the buffer layer may be provided for easy growth of the conductive layer 4 or the like provided on the upper side thereof and for protecting the surface of the substrate 1.
- An etch stop layer 3 may be grown on the buffer layer 2 (S12).
- the etch stop layer 3 is provided for processing the ridge portion 41 when the conductive layer 4 has an etching ratio similar to that of the buffer layer 2 and the substrate 1.
- AlAs, AlGaAs, InGaP, or InP may be used as the etch stop layer 3.
- the buffer layer 2 and the etch stop layer 3 may not be provided.
- the conductive layer 4 doped with n-type or p-type is grown to 100 nm to 1 um (S13). When growing, it can be grown by MBE or MOCVD.
- the conductive layer 4 may be made of a material selected from InGaP, AlGaAs, and GaAs. In this case, the conductive layer 4 may be grown to 5 to 10 times the buffer layer 2.
- a metal having a multilayer structure providing ohmic contact is provided as the electrode 5.
- various materials such as AuGe / Ni / Au or Pd / Ni / Au may be used on the n-type semiconductor, and Au / Zn / Au, Pd / Mn / Sb / Au, or Ni / Mg on the p-type semiconductor. / Au and the like can be used.
- the electrode 5 may be a method such as evaporation or sputtering, and when providing the shape of the electrode 5 by a lift off or etching process, it can be seen in FIG. As is the vertex forms the shape of the rounded electrode. According to such a configuration, it is possible to alleviate the problem of charge concentration at a specific point of the edge.
- lithography is performed in the shape of a ridge portion 41 having a larger size than that of the electrode 5, and two ridge portions 41 facing each other are used as an etching mask.
- the conductive layer 4 made of a material selected from among GaAs, InGaP and AlGaAs layers doped with n-type or p-type, which is positioned between is removed by etching.
- the conductive layer 4 is made of an InGaP or AlGaAs material
- GaAs and etching ratios provided to the buffer layer 2 and the substrate 1 are very large, and thus the conductive layer 4 may be selectively removed without a separate etch stop layer 3.
- Al x Ga 1-x As (x ⁇ 0.3) or GaAs having a low content of aluminum it is difficult to selectively etch. Therefore, Al x Ga 1-x As (x> 0.6) having a very high AlAs, InGaP or aluminum content ) Or etch stop layer (3) provided by InP to provide a ridge portion 41 by using a wet or dry etching method up thereon.
- the etch stop layer (3) between the ridge portions 41 facing each other using an etching solution or an etching chemical for removing the etch stop layer (3) (S31).
- the buffer layer 2 is partially or wholly etched and removed (S32). If the buffer layer 2 has a very low concentration of undoping level (for example, 10 15 / cm 3 ), the buffer layer 2 may be removed.
- a protective film is formed (S33).
- the protective film may be performed by depositing a dielectric such as SiN x , SiO 2, or the like.
- the passivation layer may be deposited at a thickness corresponding to about 1/4 of the laser wavelength for optical excitation. In this case, not only the function of the protective film, but also the role of an anti-reflection layer can be performed together.
- the protective film positioned on the upper part of the electrode 5 is partially exposed to allow the electrode 5 to be electrically connected to the outside (S34).
- the manufacturing method of the present invention may further include other embodiments.
- a photoconductive semiconductor switch may be manufactured even when no buffer layer is provided, and a role may be performed even when an etch stop layer is not provided.
- FIG. 4 is a cross-sectional view of a photoconductive semiconductor switch according to another embodiment.
- the embodiment shown in FIG. 4 is based on the embodiment shown in FIGS. 1 to 3, and it is characteristically different from providing structures such as electrodes on both sides of the semiconductor substrate 1. Therefore, the descriptions of FIGS. 1 to 3 are to be applied as it is to the parts without a detailed description of the structure, operation, and manufacturing method.
- a semiconductor substrate 1, a buffer layer 21, 22, and a conductive layer 42, 46 are provided. Electrodes are provided on the conductive layers 42 and 46. Specifically, the electrode is provided with a first electrode 101 and a second electrode 102 provided on the semiconductor substrate 1 spaced apart from each other on the upper side, and provided below the semiconductor substrate 1 The third electrode 103 and the fourth electrode 104 are included.
- the etch stop layer 3 is presented in a form without, but may be provided if necessary, but not excluded.
- the description of the original embodiment may be applied to the semiconductor substrate 1, the buffer layers 21, 22, and the conductive layers 42 and 46 as it is.
- the conductive layers 42 and 46 may be doped with n-type or p-type.
- one electrode on the upper side and one electrode on the lower side (for example, electrode 1 and electrode 4 are used in pairs, or electrode 2 and electrode 3 are used as a pair). Can be used). This is reduced when the electric field formed between the two electrodes to be used, in particular the electric field formed at the edge of each electrode, is paired using one electrode on the upper side and one electrode on the lower side, and thus This is because there is an advantage that can further reduce the deterioration phenomenon.
- the photoconductive semiconductor switch provided according to the present invention can be used even at high voltage and high output. Therefore, the spectrum of the use of the photoconductive semiconductor switch can be made wider, and the reliability of the use thereof can be improved.
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Abstract
Description
Claims (24)
- 입사광에 의해서 전자와 정공을 발생시키는 반도체 기판;상기 반도체 기판 상의 이격되는 두 지점에 제공되고, 풍부한 캐리어에 의해서 낮은 저항을 가지는 적어도 한 쌍의 도전층; 및상기 적어도 한 쌍의 도전층에 각각 접촉되는 적어도 한 쌍의 전극이 포함되는 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 한 쌍의 도전층 중의 적어도 하나는, 서로 마주보는 방향으로 상기 전극으로부터 더 연장되는 릿지부를 가져서, 상기 전극의 접촉부에서 저항을 낮추는 광전도 반도체 스위치.
- 제 2 항에 있어서,상기 릿지부는 상기 한 쌍의 도전층에 모두 제공되는 광전도 반도체 스위치.
- 제 2 항에 있어서,상기 한 쌍의 전극사이의 거리는 상기 릿지부의 길이에 비하여 10~500배인 광전도 반도체 스위치.
- 제 2 항에 있어서,상기 한 쌍의 전극사이의 거리는 0.1 ~ 5mm이고, 상기 릿지부의 길이는 10um ~ 0.1mm인 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 도전층은 상기 반도체 기판에 비하여 밴드갭이 더 큰 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 전극은 오믹접촉을 제공하는 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 전극은 경계선이 연속적으로 제공되는 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 반도체 기판은 GaAs기판인 광전도 반도체 스위치.
- 제 9 항에 있어서,상기 도전층은, GaAs, InGaP, 및 AlGaAsP에서 선택되는 어느 물질이 사용되는 광전도 반도체 스위치.
- 제 10 항에 있어서,상기 도전층이 GaAs인 경우에는 상기 도전층의 하측에 에치스탑층이 제공되고, 상기 에치스탑층은 AlAs 및 InP에서 선택되는 어느 물질이 사용되는 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 반도체 기판의 상측에는 도핑되지 않은 버퍼층이 적층되는 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 적어도 한 쌍의 도전층은 상기 반도체 기판의 어느 일측에 함께 제공되는 광전도 반도체 스위치.
- 제 2 항에 있어서,상기 적어도 한 쌍의 도전층은 상기 반도체 기판의 양면에 한 쌍씩 제공되고, 상기 전극은 상기 도전층의 상측에 각각 제공되는 광전도 반도체 스위치.
- 제 1 항에 있어서,상기 광전도 반도체 스위치의 사용 시에, 상기 전극은, 상기 반도체 기판의 상측에 있는 어느 전극, 상기 반도체 기판의 하측에 있는 어느 전극이, 쌍으로 사용하는 광전도 반도체 스위치.
- 제 15 항에 있어서,상기 전극은, 상기 반도체 기판의 상측에 적어도 두 개, 상기 반도체 기판의 하측에 적어도 두 개가 제공되고, 서로 거리가 먼 전극이 쌍으로 사용되는 광전도 반도체 스위치.
- 테라헤르츠를 포함하는 초고주파 대역에서 펄스형태의 광신호를 전기신호로 변환하는 광전도 반도체 스위치로서,적어도 한 쌍의 서로 이격되는 전극의 하측에 전극의 모서리부위를 포함하여 그 바깥쪽으로 더 연장되는 도핑되는 적어도 한 쌍의 도전층을 가지고,상기 적어도 한 쌍의 도전층에는, 상기 한 쌍의 도전층이 서로 마주보는 방향으로 상기 적어도 한 쌍의 전극에서 더 연장되는 릿지부를 가지는 광전도 반도체 스위치.
- 제 17 항에 있어서,상기 전극은 사각형으로서, 그 꼭지점은 둥글게 제공되는 광전도 반도체 스위치.
- 광자에 의해서 전자정공쌍을 발생시키는 반절연 반도체 기판 상에 도전층을 성장하는 것;상기 도전층에 한 쌍의 전극을 제공하는 것; 및상기 전극보다 큰 마스크를 활용하여 상기 한 쌍의 전극보다 더 큰 모양으로 릿지부를 가지도록 상기 도전층을 식각하는 것이 포함되는 광전도 반도체 스위치의 제조방법.
- 제 19 항에 있어서,상기 릿지부는 상기 한 쌍의 전극이 마주보는 방향으로 상기 전극에서 더 연장되는 광전도 반도체 스위치의 제조방법.
- 제 19 항에 있어서,상기 도전층의 성장 전에, 버퍼층 및 에치스탑층을 성장하는 공정이 더 수행되는 광전도 반도체 스위치의 제조방법.
- 제 21 항에 있어서,상기 에치스탑층과 상기 도전층을 위한, 식각용액 또는 식각화학물질은 서로 다른 광전도 반도체 스위치의 제조방법.
- 제 15 항에 있어서,상기 전극은 꼭지점이 둥글게 제공되는 광전도 반도체 스위치의 제조방법.
- 제 15 항에 있어서,상기 도전층을 식각한 다음에, 보호막을 형성하고, 상기 한 쌍의 전극을 노출시키는 공정이 포함되는 광전도 반도체 스위치의 제조방법.
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WO2019059932A1 (en) * | 2017-09-22 | 2019-03-28 | Lawrence Livermore National Security, Llc | CHARGE TRAP PHOTOCONDUCTIVE APPARATUS |
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KR101644794B1 (ko) | 2014-12-02 | 2016-08-12 | 광주과학기술원 | 광전도 반도체 스위치 및 그 스위치의 제조방법 |
US10134927B2 (en) * | 2016-07-08 | 2018-11-20 | Lawrence Livermore National Security, Llc | Reliable electrical contacts for high power photoconductive switches |
CN109166936A (zh) * | 2018-08-09 | 2019-01-08 | 镇江镓芯光电科技有限公司 | 一种高阻AlGaN基光导开关器件及其制备方法 |
US11804839B1 (en) | 2020-01-28 | 2023-10-31 | Government Of The United States As Represented By The Secretary Of The Air Force | Integrated trigger photoconductive semiconductor switch |
US20240097064A1 (en) * | 2022-09-09 | 2024-03-21 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Low resistance photoconductive semiconductor switch (pcss) |
WO2024054966A1 (en) | 2022-09-09 | 2024-03-14 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Light controlled switch module |
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US10403780B2 (en) | 2019-09-03 |
US20180053872A1 (en) | 2018-02-22 |
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