WO1988000625A1 - Method of epitaxially growing compound semiconductor materials - Google Patents
Method of epitaxially growing compound semiconductor materials Download PDFInfo
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- WO1988000625A1 WO1988000625A1 PCT/US1987/001650 US8701650W WO8800625A1 WO 1988000625 A1 WO1988000625 A1 WO 1988000625A1 US 8701650 W US8701650 W US 8701650W WO 8800625 A1 WO8800625 A1 WO 8800625A1
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- compound semiconductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/40—AIIIBV compounds wherein A is B, Al, Ga, In or Tl and B is N, P, As, Sb or Bi
- C30B29/42—Gallium arsenide
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02381—Silicon, silicon germanium, germanium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02387—Group 13/15 materials
- H01L21/02395—Arsenides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02455—Group 13/15 materials
- H01L21/02463—Arsenides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02494—Structure
- H01L21/02496—Layer structure
- H01L21/02499—Monolayers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02538—Group 13/15 materials
- H01L21/02546—Arsenides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/0257—Doping during depositing
- H01L21/02573—Conductivity type
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/0257—Doping during depositing
- H01L21/02573—Conductivity type
- H01L21/02576—N-type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02658—Pretreatments
Definitions
- This invention relates to semiconductor materials. More particularly, it is concerned with methods of epitaxially growing a semiconductor material on a substrate of the same or a different material.
- MOVPE Metalorganic vapor phase epitaxy
- the density of dislocations in the single crystal structure of III-V compound semiconductor materials is high compared to silicon.
- the dislocations are due to thermally induced stress while the bulk crystal is cooling from its growth temperature.
- These dislocations are present in wafers or substrates produced from the bulk crystal, and propagate in material epitaxially grown on the substrates. It has been even more diffi ⁇ cult to obtain satisfactory device grade layers of III-V compound semiconductor materials grown on substrates of different materials, for example, silicon and sapphire.
- some techniques such as introducing strained layer superlattice structures have been employed to reduce the dislocation density in epitaxially grown III-V compound materials, additional complications are inherent with these structures.
- the improved method of epitaxially growing a compound semiconductor material on a substrate in accordance with the present invention comprises provid- ing a substrate having exposed surface areas. Sodium ions are introduced onto the surface areas of the substrate. Then, single crystal compound semiconductor material is grown on the surface areas of the substrate by employing metalorganic vapor phase epitaxial te ⁇ h- niques.
- the presence of the sodium ions during the epitaxial growth process greatly improves the re ro- ducibility of the process in obtaining low dislocation density, single domain compound semiconductor layers directly on insulating and semiconducting substrates.
- Fig. 1 is a profile of the distribution of As, Si, and Na ions in a sample of MOVPE-grown GaAs on a substrate of silicon in accordance with the present invention.
- Fig. 2 are photomicrographs illustrating the surface morphology of (a) a sample of MOVPE-grown GaAs on a sodium-treated substrate of silicon in accordance with the method of the present invention, and (b) a sample of MOVPE-grown GaAs on a substrate of silicon not treated with sodium.
- the present invention is concerned with the epitaxial growth of semiconductor materials on substrates of essentially single crystal semiconducting or insulating materials. More specifically, the method is directed to the MOVPE growth of compound semiconduc ⁇ tor materials on substrates of compound semiconductor materials, silicon, and A1-0-.
- the compound semiconduc- tor materials of concern includes III-V compound semi ⁇ conductor materials such as GaAs, InP, InAs, InGaAs, GaAlAs, and InGaAsP, and also combinations thereof which form III-V heterojunction materials such as GaAlAs/GaAs and InGaAsP/InP.
- the method may also be employed for the homo-epitaxial and hetero-epitaxial growth of II-VI compound semiconductor materials.
- Various conductivity type imparting materials may be introduced into compound semiconductor materials to establish the desired conductivity characteristics of regions thereof.
- Typical conductivity type imparting materials include silicon, sulphur, tellurium, selenium, beryllium, zinc, cadmium, and magnesium.
- the substrate and epitaxially grown material may be the same, for example gallium arsenide on gallium arsenide, or may be different, for example gallium arsenide on silicon or A1 2 0, (sapphire) .
- the substrate is essentially single crystal material.
- Substrates of Al-O.. (sapphire or alumina) may have a large number of discontinuities in their single crystal structure relative to single crystal silicon_and still be considered as essentially single crystal for the purpose of serving as a substrate for the growth of h tero-epitaxial layers of compound semiconductor materials.
- a trace amount of sodium (Na) ions is introduced onto the surface of the substrate which is to become the interface between the substrate and the epitaxially grown compound semiconductor materi ⁇ al-
- the sodium may be present in the amount of one or two monolayers *
- the sodium-treated substrate is pro ⁇ Ded in accordance with generally known MOVPE tech- niques, and preferably the two-step MOVPE process as disclosed in the aforementioned application of Shambhu. K. Shastry may be employed.
- the sodium ions may be in the form of Na, NaCl, NaF, or NaOH dissolved in the cleaning so ⁇ lution.
- Sodium ions are present in the solution in the amount of approximately 1 percent by weight of the solution. More specifically, Na, NaCl, or NaF is added to the 20% HCl solution which is conventionally employed to clean gallium arsenide substrates. Typically, silicon substrates are cleaned with a 20% solution of HF. In accordance with the present invention NaF is added to the dilute HF solution.
- Na, NaOH, or NaF is added to the de-ionized water typically used. It is important that the sodium-based reagent employed be of high purity, preferably 99.99% or better.
- the metallic impurities which are known to be exceptionally detrimental to semiconductor devices such as iron, magnesium, beryllium, etc. must be at a minimum, since these impurities are electrically active in gallium arsenide. Additionally, applying an anodic bias of 3 to
- a single crystal gallium arsenide substrate is treated by immersing in a 20% HCl solution containing approximately 1% by weight sodium in the form of Na, NaCl, or NaF. A potential of +3 volts is applied to the substrate with respect to a platinum electrode also immersed in the solution.
- Treatment is carried on for 10-15 seconds, and then the substrate is blow dried.
- the gallium arsenide substrate is placed in the MOVPE reactor and the pressure is reduced to 25-50 torr.
- the temperature of the substrate is raised and when it reaches 300°C, arsine (10% AsH- in hydrogen)_ is in ⁇ troduced at a rate of 56 standard cubic centimeters per minute (seem) .
- the temperature is raised to 600"C, and triethylgallium (2% TEG in hydrogen) is also introduced into the reactor chamber at a rate of 125 seem.
- the vapors containing the constituent elements are carried into" the reactive chamber with a hydrogen carrier gas flow rate of 5 standard liters per minute (sl ) .
- gallium arsenide grows at a rate of about 40 nanometers per minute and layers of between 10 and 12 microns are grown in four to five hours.
- Sili- con-deped gallium arsenide layers are grown by introduc ⁇ ing silane (0.2% SiH. in hydrogen), together with the arsine and triethylgallium, while heating the substrate at a temperature of 650°C.
- the substrate is first anodically treated at +3 volts for 10—15 seconds while immersed in a 20% HF solution containing approxi- ately 1% by weight of sodium ions provided by the addition of NaF or NaCl to the solution.
- the treated substrate is then placed in an MOVPE reactor chamber and processed in accordance with the teachings of the aforementioned application of Shambhu K. Shastry.
- the pressure is reduced to between 25 torr and 50 torr, preferably about 40 torr, and the tempera ⁇ ture of the substrate is raised.
- arsine (10% AsH. in hydrogen) is admitted to the chamber at a rate of 56 seem.
- triethylgallium 2% TEG in hydrogen
- the ratio of arsenic atoms to gallium atoms admitted to the reactor chamber is about 300 to 1, and desirably is not lower than about 200 to 1.
- the conditions within the reactor chamber are such that the growth rate of gallium arsenide on the silicon substrate is at about 3 nanometers per minute. These conditions are maintained from about 2 to 3 minutes to produce a seed layer of about 5 to 10 nanometers thick.
- the substrate temperature is raised to a' temperature of between 575°C and 650°C, preferably to about 600°C (650°C if the gallium arsenide is being doped with silicon from silane) .
- the flow rate of arsine vapor is held the same, and the flow rate of the triethylgallium-hydrogen mixture is raised to 125 seem. Under these conditions a gallium arsenide buffer layer is grown at a rate of about 40 nanometers per minute. These conditions may be maintained as long as desired to obtain a layer of gallium arsenide of the desired thickness.
- Fig. 1 illustrates the depth profile of Na, Si, and As in a 1 micron thick GaAs epitaxial layer grown on a (100) silicon substrate as determined by secondary ion mass spectrometry techniques (SIMS) .
- SIMS secondary ion mass spectrometry techniques
- the sample was produced in accordance with the two-step MOVPE method as previously described.
- a high Na peak is observed at the GaAs-Si interface.
- Fig. 2 is a photomicrograph showing the surface morphology of samples of gallium arsenide grown on silicon and subjected to a preliminary sodium treatment in accordance with the invention (a) and without the preliminary sodium treatment (b) .
- the sodium-treated sample produced a mirror-like, smooth, epitaxial gallium arsenide layer without any detectable antiphase domains.
- the layer grown without the sodium treatment was hazy to the naked eye and consisted of antiphase domains.
- the antiphase boundaries in III-V compound semiconductor materials exist at two adjacent planes of Group III or Group V atoms. That is, they are electrically charged planes of imperfections.
- dislocations are line defects in the crystal structure and hence form a subset of antiphase bound ⁇ aries. It is probable that the sodium attachment process reduces or eliminates dislocations in the same manner as it does the antiphase boundaries. In the initial stages of gallium arsenide epitaxial growth on silicon or sapphire, dislocations are formed first, and lateral accumulation of dislocations then essentially seeds the antiphase boundary.
- the method of the invention can be extended to other hetero-epitaxial structures.
- the basic necessity is to overcome the problem of lattice mismatch and interface charge imbalance problems during the formation of the first or second monolayer of the epitaxially grown material.
- sodium ions onto the substrate surface in accordance with the present invention these problems are removed permitting the epitaxial growth of compound semiconductor materials with the improved results as discussed hereinabove.
Abstract
Description
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Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US885,343 | 1986-07-14 | ||
US06/885,343 US4699688A (en) | 1986-07-14 | 1986-07-14 | Method of epitaxially growing gallium arsenide on silicon |
US07/059,441 US4891091A (en) | 1986-07-14 | 1987-06-08 | Method of epitaxially growing compound semiconductor materials |
US059,441 | 1987-06-08 |
Publications (1)
Publication Number | Publication Date |
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WO1988000625A1 true WO1988000625A1 (en) | 1988-01-28 |
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ID=26738755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1987/001650 WO1988000625A1 (en) | 1986-07-14 | 1987-07-07 | Method of epitaxially growing compound semiconductor materials |
Country Status (4)
Country | Link |
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US (1) | US4891091A (en) |
EP (1) | EP0276257A4 (en) |
JP (1) | JPH01500313A (en) |
WO (1) | WO1988000625A1 (en) |
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- 1987-06-08 US US07/059,441 patent/US4891091A/en not_active Expired - Fee Related
- 1987-07-07 JP JP62504316A patent/JPH01500313A/en active Pending
- 1987-07-07 WO PCT/US1987/001650 patent/WO1988000625A1/en not_active Application Discontinuation
- 1987-07-07 EP EP19870904786 patent/EP0276257A4/en not_active Ceased
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2255399A (en) * | 1991-05-02 | 1992-11-04 | Martin John Lenzini | Magazine systems |
GB2255399B (en) * | 1991-05-02 | 1994-10-19 | Martin John Lenzini | Magazine systems |
US9595438B2 (en) | 2011-09-12 | 2017-03-14 | Nasp Iii/V Gmbh | Method for producing a III/V Si template |
Also Published As
Publication number | Publication date |
---|---|
US4891091A (en) | 1990-01-02 |
EP0276257A4 (en) | 1988-10-20 |
EP0276257A1 (en) | 1988-08-03 |
JPH01500313A (en) | 1989-02-02 |
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