US20120187366A1 - Growth method of nitride semiconductor layer and light emitting device using the growth method - Google Patents

Growth method of nitride semiconductor layer and light emitting device using the growth method Download PDF

Info

Publication number
US20120187366A1
US20120187366A1 US13/151,162 US201113151162A US2012187366A1 US 20120187366 A1 US20120187366 A1 US 20120187366A1 US 201113151162 A US201113151162 A US 201113151162A US 2012187366 A1 US2012187366 A1 US 2012187366A1
Authority
US
United States
Prior art keywords
nitride semiconductor
layer
lt
quantum well
semiconductor layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/151,162
Inventor
Euijoon Yoon
Soon-Yong Kwon
Pikyung Moon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seoul National University University-Industry Foundation
Original Assignee
Seoul National University University-Industry Foundation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR10-2004-0063722 priority Critical
Priority to KR1020040063722A priority patent/KR100513923B1/en
Priority to PCT/KR2004/002688 priority patent/WO2006016731A1/en
Priority to US59612606A priority
Application filed by Seoul National University University-Industry Foundation filed Critical Seoul National University University-Industry Foundation
Priority to US13/151,162 priority patent/US20120187366A1/en
Publication of US20120187366A1 publication Critical patent/US20120187366A1/en
Application status is Abandoned legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L33/00Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/005Processes
    • H01L33/0062Processes for devices with an active region comprising only III-V compounds
    • H01L33/0066Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound
    • H01L33/007Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound comprising nitride compounds
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02367Substrates
    • H01L21/0237Materials
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02367Substrates
    • H01L21/0237Materials
    • H01L21/02387Group 13/15 materials
    • H01L21/02389Nitrides
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02367Substrates
    • H01L21/0237Materials
    • H01L21/0242Crystalline insulating materials
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02436Intermediate layers between substrates and deposited layers
    • H01L21/02439Materials
    • H01L21/02455Group 13/15 materials
    • H01L21/02458Nitrides
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02436Intermediate layers between substrates and deposited layers
    • H01L21/02494Structure
    • H01L21/02496Layer structure
    • H01L21/02502Layer structure consisting of two layers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02518Deposited layers
    • H01L21/02521Materials
    • H01L21/02538Group 13/15 materials
    • H01L21/0254Nitrides
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02612Formation types
    • H01L21/02617Deposition types
    • H01L21/0262Reduction or decomposition of gaseous compounds, e.g. CVD
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02656Special treatments
    • H01L21/02658Pretreatments
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L33/00Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/02Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
    • H01L33/04Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a quantum effect structure or superlattice, e.g. tunnel junction
    • H01L33/06Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a quantum effect structure or superlattice, e.g. tunnel junction within the light emitting region, e.g. quantum confinement structure or tunnel barrier

Abstract

Growing a first nitride semiconductor layer on an AlxGayInI-x-yN (0<x<1, 0<y<1, 0<x+y<1) layer, a second step for reducing the thickness of the first nitride semiconductor layer by growth interruption and, growing a second nitride semiconductor layer having a band gap energy higher than that of the first nitride semiconductor layer on the first nitride semiconductor layer with the reduced thickness and a light emitting device using the growth method.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application is a U.S. Divisional application of U.S. National Phase application Ser. No. 10/596,126 filed May 31, 2006, which claims the benefit of priority of International Application No. PCT/KR2004/002688 filed Oct. 20, 2004, which claims the benefit of Korean Patent Application No. 10-2004-0063722 filed Aug. 13, 2004. The disclosures of U.S. application Ser. No. 10/596,126, and International Application PCT Application No. PCT/KR2004/002688, are incorporated herein by reference.
  • TECHNICAL FIELD
  • The present invention relates to development of a UV light source using nitride semiconductors, and more particularly, it relates to development of a nitride semiconductor light emitting device having a high light emission efficiency and a single light emission peak by using an In-rich InGaN quantum well layer with a thin thickness, instead of the conventional Ga-rich InGaN quantum well layer, as an active layer.
  • BACKGROUND ART
  • A Ga-rich InGaN quantum well layer comprising 10% or less of InN is mainly used to form a UV light source using nitride semiconductors. It is known that as the light emission wavelength is reduced, the light emission efficiency is lowered.
  • Generally, in case of a green or blue light source in the visible light range using nitride semiconductors, it is possible to obtain a high light emission efficiency in spite of a high defect density in a thin layer due to the absence of a proper substrate. This is because of the formation of a local carrier energy level caused by phase separation and composition nonuniformity of InN in the InGaN quantum well layer. It is known that this effect can be increased as the compositional rate of InN is increased.
  • However, in case of a UV light source, the InN composition in the InGaN quantum well layer is smaller than that in the visible light source, the local carrier energy level is rarely formed and thereby, the light emission efficiency is lowered. Also, as compared to the green or blue light source, the difference of energy level between an InGaN quantum well layer and a capping layer (or barrier layer) is small and thereby, the carrier confinement effect is reduced, causing a decrease in the light emission efficiency.
  • For these reasons, it is impossible to have a high light emission efficiency in the conventional UV light source using a Ga-rich InGaN quantum well layer with an InN composition of 10% or less.
  • DISCLOSURE Technical Problem
  • Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a method for producing a high efficiency light emitting device having a emission wavelength in the UV range using an In-rich InGaN quantum well layer with a thin thickness as an active layer.
  • Also, it is another object of the present invention to provide a method for growing a quantum well layer comprising an In-rich region and a region with an In compositional grading (or In composition gradient) and a nitride semiconductor light emitting device using the same. In order to provide a light emitting device comprising an active layer having a desired wavelength, the wavelength of the active layer should be controllable or expectable. Through experiment and theoretical calculation, the present inventors have found that the PL (Photoluminescence) peak of an In-rich InGaN layer which has undergone sufficient growth interruption can be moved to the UV region. Based on the findings, the present invention is to provide a nitride semiconductor light emitting device comprising an In-rich InGaN quantum well layer with a controllable emission wavelength.
  • Technical Solution
  • To accomplish the above objects, according to the present invention, there is provided a growth method of nitride semiconductor layer comprising a first step for growing a first nitride semiconductor layer on an AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) layer, a second step for reducing the thickness of the first nitride semiconductor layer by growth interruption and a third step for growing a second nitride semiconductor layer having a band gap energy higher than that of the first nitride semiconductor layer on the first nitride semiconductor layer with the reduced thickness.
  • Here, the AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) layer, the first nitride semiconductor layer, and the second nitride semiconductor layer may be doped with p-type or n-type impurities and the AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) layer and the second nitride semiconductor layer are formed of preferably GaN.
  • Also, according to the present invention, there is provided a nitride semiconductor light emitting device comprising a substrate, at least one nitride semiconductor layer grown on the substrate and including an top layer of AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1), a quantum well layer grown on the top layer of AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1), and an additional nitride semiconductor layer grown on the quantum well layer and having a band gap energy higher than that of the quantum well layer, in which the quantum well layer comprises an In-rich region, a first compositional grading region with In content increasing between the top layer of AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) and the In-rich region, and a second compositional grading region with In content decreasing between the In-rich region and the additional nitride semiconductor layer.
  • Here, the top layer of AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1), the quantum well layer and the additional nitride semiconductor layer may be doped with p-type or n-type impurities.
  • Also, according to the present invention, there is provided a nitride semiconductor light emitting device having a quantum well layer with a thickness of 2 nm or less, in which the two-dimensional quantum well layer is formed of InxGa1-xN, in which x is preferably 0.2 or more in the In-rich region of the two-dimensional quantum well layer. When the two-dimensional quantum well layer has a thickness of 2 nm or more, it is not easy to adjust the emission wavelength into the UV region by the carrier confinement effect. Therefore, the two-dimensional quantum well layer has preferably a thickness of 2 nm or less.
  • Also, according to the present invention, there is provided a nitride semiconductor light emitting device wherein the additional nitride semiconductor is made of AlyGa1-yN (0≦y≦1). Of course, the additional nitride semiconductor layer may include In.
  • Also, according to the present invention, there is provided a nitride semiconductor light emitting device further comprising at least one barrier layer of AlyGa1-yN (0≦y≦1) adjacent to the quantum well layer and having a band gap energy higher than that of the additional nitride semiconductor layer.
  • Also, according to the present invention, there is provided a nitride semiconductor light emitting device wherein the quantum well layer and the barrier layer of AlyGa1-yN (0≦y≦1) are alternately laminated to form a multi-quantum well structure. Preferrably, the pairs of the quantum well and the barrier layer of AlyGa1-yN (0≦y≦1) is 100 pairs or less.
  • Advantageous Effects
  • According to the present invention, using the growth interruption method, a thin and high quality In-rich InGaN quantum well layer is grown. Unlike the conventional UV optical device, in which a Ga-rich InGaN quantum well layer is used as an active layer, a thin In-rich InGaN quantum well layer with compositional grading is used, whereby it is possible to develop a high efficiency UV light source with a short wavelength, through the formation of local carrier energy level, carrier confinement effect and the formation of a single energy level in the energy band structure.
  • DESCRIPTION OF DRAWINGS
  • Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings in which:
  • FIG. 1 is a flow chart for explanation of the method for growing an In-rich InGaN quantum well layer according to an embodiment of the present invention;
  • FIG. 2 to FIG. 4 are cross-sectional views to show each step of the method for growing an In-rich InGaN quantum well layer according to an embodiment of the present invention;
  • FIG. 5 to FIG. 7 are transmission electron microscope photographs showing the change in layers by growth interruption of In-rich InGaN/GaN quantum well structure according to an embodiment of the present invention;
  • FIG. 8 is a view showing the results of MEIS (Medium Energy Ion Scattering) measurement and computational simulation to obtain the In composition distribution in the InGaN layer of the In-rich InGaN/GaN quantum well structure according to an embodiment of the present invention;
  • FIG. 9 is a view showing the result of PL (Photoluminescence) measurement showing the change of light emission peak at various thicknesses of the GaN capping layer upon the growth of the In-rich InGaN/GaN quantum well structure according to an embodiment of the present invention;
  • FIG. 10 is a view showing energy levels and wave functions in the energy band diagram of the In-rich InGaN/GaN quantum well structure having compositional grading to explain the PL result of FIG. 9 according to an embodiment of the present invention, based on the result of FIG. 8;
  • FIG. 11 is a view showing the calculation result of location of the light emission peak in the In-rich InGaN/GaN quantum well structure when the band gap energy of InN is 0.7 eV and 1.9 eV, based on the calculation result in the energy band diagram of FIG. 10;
  • FIG. 12 is a view showing a light emitting device comprising a quantum well layer structure according to the present invention; and
  • FIG. 13 is a view showing a light emitting device comprising a multi-quantum wells structure according to the present invention.
  • MODE FOR INVENTION
  • Now, the present invention is explained in further detail with reference to the attached drawings. The following examples may be changed into different forms and the present invention is not limited thereto. The examples are given to help those having ordinary knowledge to completely understand the present invention. In the drawings illustrating the embodiments of the present invention, the thicknesses of some layers or regions are magnified for precision of the specification and the same reference numerals indicate the same elements.
  • FIG. 1 is a flow chart for explanation of the method for growing an In-rich InGaN quantum well layer according to an embodiment of the present invention and FIG. 2 to FIG. 4 are cross-sectional views to show the respective steps of the method for growing an In-rich InGaN quantum well layer according to an embodiment of the present invention.
  • Referring to the step s1 of FIG. 1 and FIG. 2, an In-rich InGaN layer 110 is grown on a substrate 105 mounted in a chamber (not shown) at a temperature higher than the growth temperature of a general Ga-rich InGaN epitaxial layer by supplying a Group III source for In and a nitrogen source.
  • Since only the Group III source for In and the nitrogen source are supplied on the GaN substrate 105, it is expected that an InN layer is formed. However, in practice, intermixing of atoms and defect generation occur in an InN layer having a thickness of 1˜2 ML (monolayer) or more due to lattice mismatch of 10% or more between GaN an InN. As a result, the In-rich InGaN layer 110 with compositional grading and a high defect density is formed.
  • In this embodiment, the substrate 105 is a GaN substrate comprising a GaN epitaxial layer 102 grown to a thickness of 1μ or more on a hetero-substrate 100, which is made of a different material from GaN, at a high temperature of 1000° C. or more by a conventional 2-step method. Here, the hetero-substrate 100 is for example, a Si, SiC, GaAs or sapphire (Al2O3) substrate. However, the In-rich InGaN layer 110 may be grown on a single crystal GaN substrate 102 which is grown by HVPE without using the hetero-substrate 100.
  • In a preferred embodiment, when the In-rich InGaN layer 110 is grown using a MOCVD (metalorganic chemical vapor deposition) apparatus, the substrate 105 is kept at a high temperature of 700° C. to 800° C. Here, since the decomposition of the thin layer may take place due to a high equilibrium vapor pressure of the In-rich InGaN layer 110, a sufficient amount of the Group III source and the nitrogen source are supplied so that the deposited layer can cover the entire substrate 105. For example, the amount of the Group III source and the nitrogen source flowing into the chamber is about 10 times of the amount used conventionally. If TMIn (Trimethylindium) has been conventionally supplied to the chamber at 30 sccm to grow a bulk InN layer, 300 sccm of TMIn is supplied according to the present invention. The In-rich InGaN layer 110 grown using a sufficient amount of the Group III source and the nitrogen source at a high temperature has a relatively uneven surface and a lot of defects due to the increase of deformation energy caused by the lattice mismatch with the substrate 105. The In-rich InGaN layer 110 may be grown at 700° C. or less, for example, 650° C. In this case, it should be considered that the defect density may be increased due to the reduction of atom mobility in the In-rich InGaN layer 110 because of the relatively low growth temperature.
  • Next, referring to the step s2 of FIG. 1 and FIG. 3, growth interruption to intercept the supply of the Group III source is performed to convert the In-rich InGaN layer 110 into a two-dimensional nitride semiconductor buffered layer 110 a with a uniform thickness.
  • Since the equilibrium vapor pressure of the nitride semiconductor is very high, during the growth interruption, much decomposition occurs in the In-rich InGaN layer 110. Particularly, this decomposition phenomenon takes place more vigorously at the protruded region (convex surface) in the In-rich InGaN layer 110. Through the decomposition, the movement from the surface of molecules, and the diffusion in the thin layer, the nitride semiconductor buffered layer 110 a has a reduced thickness and the surface becomes flat after the growth interruption. Therefore, by properly controlling the growth interruption time, it is possible to obtain a flat and thin In-rich InGaN layer 110 a having a thickness of about 1 nm. The growth interruption time is set in the range of 60 seconds or less, depending on the desired thickness. The growth interruption time may vary according to the growth temperature of the In-rich InGaN layer 110, and thus, it should not be construed that the present invention is limited to the growth interruption time of 60 seconds or less. Yet, it should be considered that the defect density in the thin layer may be increased when the growth interruption time is increased.
  • After the growth interruption step, the In-rich InGaN layer 110 a has the defects considerably reduced. During the growth interruption, the growth interruption temperature is kept at a high temperature equal to the growth temperature of the In-rich InGaN layer 110. Right after the deposition, the In-rich InGaN layer 110 having a high defect density and a nonuniform thickness turns to the In-rich InGaN buffered layer 110 a having a low defect density and a thickness of about 1 nm by the selective decomposition, the movement from the surface of molecules in protruded region, and the diffusion in the thin layer during the growth interruption.
  • Next, according to the step s3 of FIG. 1, a nitride semiconductor capping layer 120 is grown on the In-rich InGaN layer 110 a having a reduced defect density by the growth interruption at the same or higher temperature for application as an optical device as shown in FIG. 4. The nitride semiconductor capping layer 120 is grown using a material having a energy band gap greater than that of the In-rich InGaN layer 110 a. In a preferred embodiment, GaN, AlN or AlGaN based material is appropriate for the nitride semiconductor capping layer 120. Here, the nitride semiconductor capping layer 120 is grown at a temperature equal to the growth temperature of the In-rich InGaN layer 110 or at a temperature higher than the growth temperature of the In-rich InGaN layer 110 for the improvement of properties. The thickness may vary from several nm to several tens nm, as needed. In order to shift the emission wavelength to the short wavelength region, a thin barrier layer having a band gap energy higher than that of the capping layer may be applied on one side or both sides of the In-rich InGaN layer.
  • Thus, according to the present invention, by using an In-rich InGaN epitaxial layer having a thickness of about 1 nm as an active layer on the substrate instead of the conventional Ga-rich InGaN epitaxial layer, it is possible to considerably improve the formation of local carrier energy level and the carrier confinement effect in the quantum well structure. As a result, it is possible to produce an optical device with an improved light emission efficiency.
  • The present invention is explained in further detail by the following experimental examples and the contents which are not described herein are omitted since those skilled in the art may technically infer them. Also, the following examples do not intend to limit the present invention.
  • The crystal growing method used for forming each thin layer in this example was a low-pressure MOCVD with a chamber pressure of 300 Torr and a GaN substrate comprising a GaN epitaxial layer grown to a thickness of 2μ on a sapphire substrate was used as a substrate.
  • As the Group III source and the nitrogen source, TMIn (Trimethylindium), TMGa (Trimethylgallium), ammonia and the like were used and as the carrier gas, H2 or N2 gas was used.
  • First of all, the GaN substrate was heated to 1100° C. and kept at that temperature for 5 minutes to remove surface impurities. Here, ammonia as a nitrogen source was flown, using H2 gas as a carrier gas, to prevent the decomposition of the GaN epitaxial layer at the high temperature.
  • Then, the temperature of the substrate was lowered to 730° C. to grow an In-rich InGaN quantum well layer. After the temperature was lowered to 730° C., the carrier gas was changed to N2 gas and TMIn and ammonia were supplied to grow an InN layer for 90 seconds. However, the produced InN layer had nonuniform thickness and defects. Also, due to the atoms-intermixing phenomenon between the InN layer and the GaN substrate disposed below, in practice, not the InN layer but an In-rich InGaN epitaxial layer with compositional grading was formed.
  • FIG. 5 is a transmission electron microscope photograph taken after an In-rich InGaN layer with compositional grading was grown at 730° C. and a GaN capping layer having a thickness of 20 nm was formed at the same temperature. As shown in FIG. 5, when the GaN capping layer 220 was grown right after the high temperature In-rich InGaN layer 210 was formed on the GaN substrate 205 without growth interruption, the produced high temperature In-rich InGaN layer 210 having a thickness of about 2.5 nm showed nonuniformity in thickness and the GaN capping layer 220 grown thereon showed a high defect density.
  • FIG. 6 is a transmission electron microscope photograph taken after the In-rich InGaN layer which has been grown at 730° C. is subjected to the growth interruption for 10 seconds by supplying only ammonia while intercepting the supply of TMIn and a GaN capping layer is covered thereon. As shown in FIG. 6, after the growth interruption, the thickness of the In-rich InGaN layer 210 a become uniform to 1 nm and the GaN capping layer 220 grown thereon showed a remarkably reduced defect density as compared to the case shown in FIG. 5.
  • FIG. 7 is a high resolution transmission electron microscope photograph taken after the growth interruption for 10 seconds. As shown in FIG. 6 and FIG. 7, by the growth interruption for 10 seconds, the In-rich InGaN layer 210 a was uniform in thickness and had a smooth interface with the GaN capping layer 220.
  • Like this, after the flat In-rich InGaN layer with a thickness of 1 nm was formed through growth and growth interruption at 730° C., the GaN capping layer was grown to 20 nm at the same temperature for the formation of a single quantum well structure. Meanwhile, a specimen of a GaN capping layer with a thickness of 2 nm was also grown for MEIS (Medium Energy Ion Scattering) study of In composition distribution in the InGaN layer.
  • FIG. 8 is a view showing the results of MEIS measurement and computational simulation of the In composition distribution in the In-rich InGaN/GaN quantum well structure having compositional grading, grown as described above. The MEIS method is a non-destructive method capable of precisely measuring the composition in a very thin layer at an atom level resolution. The computational simulation was performed using the ‘SIMPLE’ program which is made by slightly revising the conventional ISAP (Ion Scattering Analysis Program) to examine the composition change according to the thickness of the InGaN well layer.
  • On the MEIS measurement, the specimen of the GaN capping layer grown to a thickness of 2 nm was used to increase sensitivity on the surface. As a result, it was found that the In-rich InGaN layer having a thickness of 0.43 nm was present and the In content in this layer was about 60 to 70%, which was within the range of 50 to 80% resulted from the theoretical calculation. Also, it was found that In compositional grading was present in the InGaN/GaN interfaces. It was shown by the computational simulation, that 0.12 nm InGaN having an In content of 10% was present to the direction of the GaN capping layer, and 0.25 nm InGaN having an In content of 30% was present to the direction of the GaN substrate. The total thickness of the InGaN layer obtained by the MEIS measurement was 0.8 nm which agreed with the result of the high resolution electron transmission image in FIG. 7.
  • FIG. 9 shows photoluminescence (PL) peak spectra resulting from the In-rich InGaN/GaN quantum well structure having compositional grading made by the above-described method, in which PL peak in the near UV region of about 400 nm was present regardless of the thickness of the GaN capping layer.
  • This means that the energy level in InGaN/GaN quantum well structure was not affected by the change in the thickness of the capping layer. It is believed that this is because the high deformation energy caused by the high lattice mismatch of 10% or more was relieved by depositing InN on the GaN substrate.
  • FIG. 10 shows the energy band diagram in In0.6Ga0.4N/GaN quantum well structure (GaN/In0.1Ga0.9N (0.12 nm)/In0.6Ga0.4N (0.43 nm)/In0.3Ga0.7N (0.25 nm)/GaN) with compositional grading, based on MEIS result.
  • Because of difficulty in growth due to, for example, high equilibrium vapor pressure, the properties of InN have not been precisely informed. Recently, some groups that succeeded in growing an InN thin layer by advancement of growth technology have reported that the band gap energy of InN is not 1.9 eV, as known to the art, but 0.7 eV. However, there is no report on the precise band gap energy of InN. Therefore, considering both cases, the light emission peaks in the In0.6Ga0.4N/GaN quantum well structure having compositional grading when the band gap energy of InN is 0.7 eV and 1.9 eV were calculated.
  • FIG. 11 shows that the In-rich InGaN/GaN quantum well structure having compositional grading can have 400 nm light emission energy. For this calculation, the Schroedinger equation was solved using the Fourier series method calculating energy levels and wave functions in the frequency space. When the band gap energy of InN was 0.7 eV (1770 nm) and 1.9 eV (653 nm), it was found that by forming the In-rich InGaN/GaN quantum well structure, the emission peak was reduced to 442 nm and 393 nm, respectively.
  • Of course, considering the inaccuracy in values of InN related material constants, these data are not absolute but it was proved that the emission in the In-rich InGaN/GaN quantum well structure having compositional grading could be observed in the near UV region. Also, since this structure showed only one energy level, a near UV light source of a single wavelength could be obtained upon application to an optical device, regardless of the number of excited carriers.
  • Also, it was possible to shift the emission wavelength to the shorter wavelength region by forming a thin barrier layer having a band gap energy higher than that of the capping layer on one side or both sides of the In-rich InGaN layer. For example, it was found through calculation that in case of the Ino.6Gao.4N/GaN quantum well structure having compositional grading, the emission wavelength is shifted to 378 nm by forming an AlN barrier layer of 3 nm.
  • Up to now, the present invention is described by the example using the MOCVD method, however, MBE (molecular beam epitaxy) or CBE (chemical beam epitaxy) may be used.
  • Up to now, the preferred embodiment of the present invention has been described. However, it is clear that various modifications can be made without departing the scope of the present invention.
  • FIG. 12 is a view showing a light emitting device comprising a single quantum well structure according to the present invention. The light emitting device comprises a substrate 1, a buffer layer 2 grown on the substrate 1, an n-type contact layer 3 of AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) grown on the buffer layer 2, a quantum well layer 110 a according to the present invention grown on the n-type contact layer 3, a capping layer 4 of p-type nitride semiconductor grown on the quantum well layer 110 a, a p-type contact layer 5 of AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) grown on the capping layer 4, a light-transmittable electrode layer 6 and a p-type pad 7 formed on the p-type contact layer 5, and an n-type electrode 8 formed on the n-type contact layer 3. Here, the capping layer 4 and the p-type contact layer 5 may be formed of the same material.
  • FIG. 13 is a view showing a light emitting device comprising a multi-quantum wells structure according to the present invention which has a structure comprising the quantum well layer 110 a and the barrier layer 110 b laminated alternately unlike FIG. 12.
  • The light emitting device according to the present invention is not limited to the structures shown in FIG. 12 and FIG. 13. On the basis of the quantum well layer 110 a, an AlxGayIn1-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) layer disposed under the quantum well layer 110 a and a capping layer disposed over the quantum well layer 110 a, the light emitting device can be expanded to any light emitting device (such as light emitting diode and laser diode) with any structure that is clear to the person in the art.

Claims (23)

1. A growth method of nitride semiconductor layer comprising:
a first step for growing a first nitride semiconductor layer on an AlχGayIni-x-yN (0<x<1, 0<y<1, 0<x+y<1) layer;
a second step for reducing the thickness of the first nitride semiconductor layer by growth interruption; and
a third step for growing a second nitride semiconductor layer having a band gap energy higher than that of the first nitride semiconductor layer on the first nitride semiconductor layer with the reduced thickness.
2. The growth method of nitride semiconductor layer in claim 1, wherein at the first step, an in source and a nitrogen source is used for growing the first nitride semiconductor layer.
3. The growth method of nitride semiconductor layer in claim 2, wherein an Ga source is further used for the first nitride semiconductor layer and the amount of the Ga source is very small as compared to the amount of the In source.
4. The growth method of nitride semiconductor layer in claim 3, wherein at the second step, the growth interruption is performed by supplying the nitrogen source with the supply of the In source intercepted.
5. The growth method of nitride semiconductor layer in claim 2, wherein at the second step, the growth interruption is performed by supplying the nitrogen source with the supply of the In source intercepted.
6. The growth method of nitride semiconductor layer in claim 1, wherein at the second step, the reduced first nitride semiconductor layer has a quantum well structure.
7. The growth method of nitride semiconductor layer in claim 1, wherein at the first step, the first nitride semiconductor layer is grown at a temperature of 700° C. to 800° C.
8. The growth method of nitride semiconductor layer in claim 1, wherein the temperature of the first nitride semiconductor during the growth and the growth interruption is maintained.
9. The growth method of nitride semiconductor layer in claim 1, wherein at the second step, the growth interruption time is equal to or less than 60 seconds.
10. The growth method of nitride semiconductor layer in claim 1, wherein the second nitride semiconductor layer if grown at a temperature equal to or higher than that of the first nitride semiconductor layer.
11. A nitride semiconductor light emitting device comprising:
a substrate;
at least one nitride semiconductor layer grown on the substrate and including an top layer of AlxGayini-x-yN (0≦x≦1, 0<y≦1, 0<x+y<1);
a quantum well layer grown on the top layer of AlxGayin1-x-yN (0<x<1, 0<y<1, 0<x+y<1); and,
an additional nitride semiconductor layer grown on the quantum well layer and having a band gap energy higher than that of the quantum well layer;
wherein the quantum well layer comprises an In-rich region, a first compositional grading region with In content increasing between the top layer of AlxGayIni-x-yN (0≦x≦1, 0<y≦1, 0<x+y≦1) and the In-rich region, and a second compositional grading region with In content decreasing between the In-rich region and the additional nitride semiconductor layer.
12. The nitride semiconductor light emitting device in claim 11, wherein the quantum well layer is formed of InxGai-xN and x in the In-rich region of the quantum well layer is equal to or more than 0.6.
13. The nitride semiconductor light emitting device in claim 11, wherein the quantum well layer is grown using an In source and a nitrogen source, and the thickness of the quantum well is reduced by growth interruption which is performed by supplying the nitrogen source with the supply of the In source intercepted.
14. The nitride semiconductor light emitting device in claim 11, wherein the quantum well layer is formed of InxGai-xN and x in the In-rich region of the quantum well layer is within a range of 0.5 to 0.8.
15. The nitride semiconductor light emitting device in claim 11, wherein the thickness of the quantum well is equal to or less than 2 nm.
16. The nitride semiconductor light emitting device in claim 15, wherein the quantum well layer is formed of InxGai-xN and x in the In-rich region of the quantum well layer is equal to or more than 0.2.
17. The nitride semiconductor light emitting device in claim 11, wherein the additional nitride semiconductor is formed of AlyGai-yN (O≦y≦1).
18. The nitride semiconductor light emitting device in claim 11, further comprising at least one barrier layer of AlyGai-yN (0≦y≦1) adjacent to the quantum well layer and having a band gap energy higher than that of the additional nitride semiconductor layer.
19. The nitride semiconductor light emitting device in claim 18, wherein the at least one barrier layer of AlyGai-yN (0≦y≦1) has a thickness equal to or less than 5 nm.
20. The nitride semiconductor light emitting device in claim 18, wherein the quantum well layer and the at least barrier layer of AlyGa1-yN (0≦y≦1) are alternately laminated to form a multi-quantum well structure.
21. The nitride semiconductor light emitting device in claim 20, wherein the pairs of the quantum well and the at least barrier layer of AlyGa1-yN (O≦y≦1) are equal to or less than 100 pairs.
22. The nitride semiconductor light emitting device in claim 11, wherein the top layer of AlxGayIni-χyN (0<x<1, 0<y<1, 0<x+y<1) is GaN.
23. The nitride semiconductor light emitting device in claim 12, x in the In-rich region of the quantum well layer is equal to or less than 0.7.
US13/151,162 2004-08-13 2011-06-01 Growth method of nitride semiconductor layer and light emitting device using the growth method Abandoned US20120187366A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR10-2004-0063722 2004-08-13
KR1020040063722A KR100513923B1 (en) 2004-08-13 2004-08-13 Growth method of nitride semiconductor layer and light emitting device using the growth method
PCT/KR2004/002688 WO2006016731A1 (en) 2004-08-13 2004-10-20 Growth method of nitride semiconductor layer and light emitting device using the growth method
US59612606A true 2006-05-31 2006-05-31
US13/151,162 US20120187366A1 (en) 2004-08-13 2011-06-01 Growth method of nitride semiconductor layer and light emitting device using the growth method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/151,162 US20120187366A1 (en) 2004-08-13 2011-06-01 Growth method of nitride semiconductor layer and light emitting device using the growth method

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
PCT/KR2004/002688 Division WO2006016731A1 (en) 2004-08-13 2004-10-20 Growth method of nitride semiconductor layer and light emitting device using the growth method
US59612606A Division 2006-05-31 2006-05-31

Publications (1)

Publication Number Publication Date
US20120187366A1 true US20120187366A1 (en) 2012-07-26

Family

ID=35839472

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/596,126 Active US7977664B2 (en) 2004-08-13 2004-10-20 Growth method of nitride semiconductor layer and light emitting device using the growth method
US13/151,162 Abandoned US20120187366A1 (en) 2004-08-13 2011-06-01 Growth method of nitride semiconductor layer and light emitting device using the growth method

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US10/596,126 Active US7977664B2 (en) 2004-08-13 2004-10-20 Growth method of nitride semiconductor layer and light emitting device using the growth method

Country Status (5)

Country Link
US (2) US7977664B2 (en)
JP (1) JP4719689B2 (en)
KR (1) KR100513923B1 (en)
DE (1) DE112004002804B4 (en)
WO (1) WO2006016731A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2985792A4 (en) * 2013-04-12 2016-11-16 Seoul Viosys Co Ltd Ultraviolet light-emitting device
US9646827B1 (en) * 2011-08-23 2017-05-09 Soraa, Inc. Method for smoothing surface of a substrate containing gallium and nitrogen
US9711682B2 (en) 2012-08-23 2017-07-18 Lg Innotek Co., Ltd. Multiple quantum well light emitting device with multi-layer barrier structure

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7504274B2 (en) 2004-05-10 2009-03-17 The Regents Of The University Of California Fabrication of nonpolar indium gallium nitride thin films, heterostructures and devices by metalorganic chemical vapor deposition
KR100649749B1 (en) * 2005-10-25 2006-11-17 삼성전기주식회사 Nitride semiconductor light emitting device
KR100872717B1 (en) 2007-06-22 2008-12-05 엘지이노텍 주식회사 Light emitting device and manufacturing method thereof
US20090001416A1 (en) * 2007-06-28 2009-01-01 National University Of Singapore Growth of indium gallium nitride (InGaN) on porous gallium nitride (GaN) template by metal-organic chemical vapor deposition (MOCVD)
KR101137911B1 (en) * 2007-12-18 2012-05-03 삼성코닝정밀소재 주식회사 Fabricating method for gallium nitride wafer
JP4539752B2 (en) * 2008-04-09 2010-09-08 住友電気工業株式会社 Method for manufacturing a forming method and a semiconductor light-emitting device having a quantum well structure
JP5136437B2 (en) * 2009-01-23 2013-02-06 住友電気工業株式会社 Method for fabricating nitride-based semiconductor optical device
JP2010199236A (en) * 2009-02-24 2010-09-09 Sumitomo Electric Ind Ltd Light emitting element producing method and light emitting element
DE102009015569A1 (en) * 2009-03-30 2010-10-07 Osram Opto Semiconductors Gmbh The optoelectronic semiconductor chip
DE112011101530T5 (en) * 2010-04-30 2013-07-11 Trustees Of Boston University High-efficiency ultraviolet light emitting diode with band structure potential fluctuations
KR101303031B1 (en) 2010-05-04 2013-09-03 조병구 Method for the formation of multi component thin films and quantum well structure containing multi component by sub-lattice structure controlling technique through Plasma-enhanced atomic layer deposition
US8723189B1 (en) 2012-01-06 2014-05-13 Trustees Of Boston University Ultraviolet light emitting diode structures and methods of manufacturing the same
US9112103B1 (en) 2013-03-11 2015-08-18 Rayvio Corporation Backside transparent substrate roughening for UV light emitting diode
US9219204B1 (en) 2013-03-11 2015-12-22 Rayvio Corporation Semiconductor device and a method of making a semiconductor device
US9876143B2 (en) 2014-10-01 2018-01-23 Rayvio Corporation Ultraviolet light emitting device doped with boron

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5684309A (en) * 1996-07-11 1997-11-04 North Carolina State University Stacked quantum well aluminum indium gallium nitride light emitting diodes
US6440214B1 (en) * 1999-06-12 2002-08-27 Sharp Kabushiki Kaisha Method of growing a semiconductor layer
US6500258B2 (en) * 2000-06-17 2002-12-31 Sharp Kabushiki Kaisha Method of growing a semiconductor layer
WO2004008551A1 (en) * 2002-07-16 2004-01-22 Nitride Semiconductors Co.,Ltd. Gallium nitride-based compound semiconductor device
US20040214412A1 (en) * 2001-06-13 2004-10-28 Barnes Jennifer Mary Method of growing a semiconductor layer

Family Cites Families (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH089518B2 (en) * 1990-12-28 1996-01-31 名古屋大学長 The method for manufacturing a compound semiconductor single crystal
DE69431333D1 (en) * 1993-10-08 2002-10-17 Mitsubishi Cable Ind Ltd GaN single crystal
JP2738646B2 (en) 1993-12-27 1998-04-08 五洋建設株式会社 The junction structure of the reinforced concrete columns and steel beams
US5838029A (en) * 1994-08-22 1998-11-17 Rohm Co., Ltd. GaN-type light emitting device formed on a silicon substrate
US5670798A (en) * 1995-03-29 1997-09-23 North Carolina State University Integrated heterostructures of Group III-V nitride semiconductor materials including epitaxial ohmic contact non-nitride buffer layer and methods of fabricating same
JPH08293473A (en) * 1995-04-25 1996-11-05 Sumitomo Electric Ind Ltd Epitaxial wafer and compound semiconductor light emitting element and their manufacture
JPH0936429A (en) 1995-07-25 1997-02-07 Sumitomo Chem Co Ltd Fabrication of iii-v compound semiconductor
EP0772249B1 (en) * 1995-11-06 2006-05-03 Nichia Corporation Nitride semiconductor device
US6608330B1 (en) * 1998-09-21 2003-08-19 Nichia Corporation Light emitting device
JP3470054B2 (en) * 1998-12-28 2003-11-25 シャープ株式会社 Nitride iii-v compound semiconductor device
JP3350849B2 (en) 1999-02-08 2002-11-25 信男 青木 Newspaper delivery for rainwater prevention device
US6303404B1 (en) * 1999-05-28 2001-10-16 Yong Tae Moon Method for fabricating white light emitting diode using InGaN phase separation
US6133589A (en) * 1999-06-08 2000-10-17 Lumileds Lighting, U.S., Llc AlGaInN-based LED having thick epitaxial layer for improved light extraction
GB9913950D0 (en) * 1999-06-15 1999-08-18 Arima Optoelectronics Corp Unipolar light emitting devices based on iii-nitride semiconductor superlattices
JP2001007379A (en) * 1999-06-24 2001-01-12 Sharp Corp Gallium nitride based compound semiconductor light receiving element
JP2001102633A (en) * 1999-07-26 2001-04-13 Sharp Corp Method of manufacturing nitride-based compound semiconductor light emitting element
JP2001121824A (en) 1999-10-27 2001-05-08 Daicel Chem Ind Ltd Multi-printing thermal transfer sheet
US6515313B1 (en) * 1999-12-02 2003-02-04 Cree Lighting Company High efficiency light emitters with reduced polarization-induced charges
JP2001298214A (en) * 2000-02-10 2001-10-26 Sharp Corp Semiconductor light-emitting element and method of manufacturing the same
JP3795298B2 (en) * 2000-03-31 2006-07-12 株式会社豊田中央研究所 Method for producing Iii nitride compound semiconductor light-emitting device
DE10032246A1 (en) * 2000-07-03 2002-01-17 Osram Opto Semiconductors Gmbh LED chip on the basis of InGaN and process for its preparation
JP2002094113A (en) * 2000-09-19 2002-03-29 Sharp Corp Method for fabricating iii-v nitride-based semiconductor light emitting device
US7102158B2 (en) * 2000-10-23 2006-09-05 General Electric Company Light-based system for detecting analytes
US6906352B2 (en) * 2001-01-16 2005-06-14 Cree, Inc. Group III nitride LED with undoped cladding layer and multiple quantum well
JP4646095B2 (en) * 2001-04-19 2011-03-09 シャープ株式会社 The semiconductor light emitting device and a manufacturing method thereof, and optical information recording reproducing apparatus
US6955933B2 (en) * 2001-07-24 2005-10-18 Lumileds Lighting U.S., Llc Light emitting diodes with graded composition active regions
KR100568701B1 (en) * 2002-06-19 2006-04-07 니폰덴신뎅와 가부시키가이샤 Semiconductor Light-Emitting Device
JP4300004B2 (en) * 2002-08-30 2009-07-22 日本電信電話株式会社 Semiconductor light-emitting element
JP2004140339A (en) 2002-09-25 2004-05-13 Univ Chiba Device having nitride-based heterostructure and its manufacturing method
TWI222756B (en) * 2002-11-12 2004-10-21 Epitech Corp Ltd Lateral current blocking light emitting diode and method of making the same
JP4377600B2 (en) * 2003-03-24 2009-12-02 株式会社東芝 3 nitride semiconductor laminated structure, a manufacturing method, and group III nitride semiconductor device
JP2004356522A (en) * 2003-05-30 2004-12-16 Sumitomo Chem Co Ltd Group 3-5 compound semiconductor, its manufacturing method, and its use
US6995389B2 (en) * 2003-06-18 2006-02-07 Lumileds Lighting, U.S., Llc Heterostructures for III-nitride light emitting devices
GB2407701A (en) * 2003-10-28 2005-05-04 Sharp Kk Manufacture of a semiconductor light-emitting device
US7138648B2 (en) * 2003-12-17 2006-11-21 Palo Alto Research Center Incorporated Ultraviolet group III-nitride-based quantum well laser diodes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5684309A (en) * 1996-07-11 1997-11-04 North Carolina State University Stacked quantum well aluminum indium gallium nitride light emitting diodes
US6440214B1 (en) * 1999-06-12 2002-08-27 Sharp Kabushiki Kaisha Method of growing a semiconductor layer
US6500258B2 (en) * 2000-06-17 2002-12-31 Sharp Kabushiki Kaisha Method of growing a semiconductor layer
US20040214412A1 (en) * 2001-06-13 2004-10-28 Barnes Jennifer Mary Method of growing a semiconductor layer
WO2004008551A1 (en) * 2002-07-16 2004-01-22 Nitride Semiconductors Co.,Ltd. Gallium nitride-based compound semiconductor device
US7700940B2 (en) * 2002-07-16 2010-04-20 Nitride Semiconductor Co., Ltd. Gallium nitride-based compound semiconductor device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9646827B1 (en) * 2011-08-23 2017-05-09 Soraa, Inc. Method for smoothing surface of a substrate containing gallium and nitrogen
US9711682B2 (en) 2012-08-23 2017-07-18 Lg Innotek Co., Ltd. Multiple quantum well light emitting device with multi-layer barrier structure
EP2985792A4 (en) * 2013-04-12 2016-11-16 Seoul Viosys Co Ltd Ultraviolet light-emitting device

Also Published As

Publication number Publication date
WO2006016731A1 (en) 2006-02-16
JP4719689B2 (en) 2011-07-06
US20070075307A1 (en) 2007-04-05
JP2007515791A (en) 2007-06-14
US7977664B2 (en) 2011-07-12
DE112004002804T5 (en) 2007-01-25
KR100513923B1 (en) 2005-09-02
DE112004002804B4 (en) 2013-04-25

Similar Documents

Publication Publication Date Title
DE10223797B4 (en) Low-driving light-emitting III-nitride devices and manufacturing method therefor
US5432808A (en) Compound semicondutor light-emitting device
Wang et al. Molecular beam epitaxy growth of GaN, AlN and InN
US6440823B1 (en) Low defect density (Ga, Al, In)N and HVPE process for making same
US5780876A (en) Compound semiconductor light emitting device and manufacturing method thereof
US6555845B2 (en) Method for manufacturing group III-V compound semiconductors
US9437686B2 (en) Gallium nitride devices with discontinuously graded transition layer
US8324005B2 (en) Methods of fabricating nitride semiconductor structures with interlayer structures
US5679152A (en) Method of making a single crystals Ga*N article
US7176479B2 (en) Nitride compound semiconductor element
US6489636B1 (en) Indium gallium nitride smoothing structures for III-nitride devices
US6635904B2 (en) Indium gallium nitride smoothing structures for III-nitride devices
EP2276059A1 (en) Method of controlling stress in gallium nitride films deposited on substrates
US6350666B2 (en) Method and apparatus for producing group-III nitrides
US6645885B2 (en) Forming indium nitride (InN) and indium gallium nitride (InGaN) quantum dots grown by metal-organic-vapor-phase-epitaxy (MOCVD)
US20100133506A1 (en) Nitride semiconductor light emitting element and method for manufacturing nitride semiconductor
JP2017011278A (en) NON-POLAR (Al, B, In, Ga)N QUANTUM WELL, HETEROSTRUCTURE MATERIAL, AND DEVICE
JP5589278B2 (en) Nitride semiconductor crystal growth method and nitride semiconductor light emitting device
US8035113B2 (en) Optical devices featuring textured semiconductor layers
JP4901145B2 (en) Compound semiconductor device and manufacturing method thereof
TWI489668B (en) Method for heteroepitaxial growth of high-quality n-face gan, inn, and aln and their alloys by metal organic chemical vapor deposition
US7102173B2 (en) Nitride semiconductor device and method of manufacturing the same
US6362496B1 (en) Semiconductor light emitting device having a GaN-based semiconductor layer, method for producing the same and method for forming a GaN-based semiconductor layer
US20140127848A1 (en) Nitride semiconductor light-emittting device and process for producing the same
US20070138505A1 (en) Low defect group III nitride films useful for electronic and optoelectronic devices and methods for making the same

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION