EP1665350A1 - Verfahren zur behandlung heteroepitaktisch gewachsener halbleiterschichten auf halbleitersubstraten, halbleitersubstrat mit einer behandelten halbleiterschicht und halbleiterbauelement aus einem solchen halbleitersubstrat - Google Patents
Verfahren zur behandlung heteroepitaktisch gewachsener halbleiterschichten auf halbleitersubstraten, halbleitersubstrat mit einer behandelten halbleiterschicht und halbleiterbauelement aus einem solchen halbleitersubstratInfo
- Publication number
- EP1665350A1 EP1665350A1 EP04786866A EP04786866A EP1665350A1 EP 1665350 A1 EP1665350 A1 EP 1665350A1 EP 04786866 A EP04786866 A EP 04786866A EP 04786866 A EP04786866 A EP 04786866A EP 1665350 A1 EP1665350 A1 EP 1665350A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- semi
- conductor
- substrate
- epitaxial 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.)
- Withdrawn
Links
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/90—Thermal treatments, e.g. annealing or sintering
- H10P95/904—Thermal treatments, e.g. annealing or sintering of Group III-V semiconductors
-
- 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
- C30B29/16—Oxides
-
- 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
- C30B29/36—Carbides
-
- 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
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
-
- 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
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/80—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials
- H10D62/83—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group IV materials, e.g. B-doped Si or undoped Ge
- H10D62/832—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group IV materials, e.g. B-doped Si or undoped Ge being Group IV materials comprising two or more elements, e.g. SiGe
- H10D62/8325—Silicon carbide
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/29—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by the substrates
- H10P14/2901—Materials
- H10P14/2902—Materials being Group IVA materials
- H10P14/2905—Silicon, silicon germanium or germanium
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/32—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by intermediate layers between substrates and deposited layers
- H10P14/3202—Materials thereof
- H10P14/3204—Materials thereof being Group IVA semiconducting materials
- H10P14/3211—Silicon, silicon germanium or germanium
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3402—Deposited materials, e.g. layers characterised by the chemical composition
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/38—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
- H10P14/3802—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/38—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
- H10P14/3822—Controlling the interface between substrate and epitaxial layer, e.g. by ion implantation followed by annealing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P34/00—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices
- H10P34/40—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation
- H10P34/42—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation with electromagnetic radiation, e.g. laser annealing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/90—Thermal treatments, e.g. annealing or sintering
Definitions
- the invention relates to a method for the treatment of heteroepitaxically grown semiconductor layers on semiconductor substrates, a semiconductor substrate with a treated semiconductor layer and a semiconductor component made from such a semiconductor substrate.
- the invention relates to a method with which it is possible to use semiconductor layers such as thin cubic SiC layers (3C- S ⁇ C) to produce with improved quality on semiconductor substrates, such as in particular silicon substrates
- SiC exists in two main crystalline modifications, the hexagonal and the cubic the hexagonal modification, commonly referred to as ⁇ -SiC, has a large number of polytypes, of which 4H-S ⁇ C and 6H-S / C are the best known, the cubic modification has the zinc blende structure and is known as ⁇ -SiC or 3C-SiC
- the cubic material should be given preference, since it has the highest electron mobility of all SiC polytypes in the temperature range from 300 to 1000 K.
- carefully manufactured cubic layers should be free from certain stallographic defects, which are also unavoidable in hexagonal modifications the components produced in cubic material a lower diode threshold voltage.
- a natural problem of 3C-SiC / Si heteroepitaxy is the lattice mismatch of approximately 20% between the two lattices, which leads to the generation of a very high density of crystallographic defects in the thin (20-40nm) 3C-SiC- Layer leads already during the initial phase of growth. These defects then lead to the formation of extensive defects as they continue to grow, which extend through the entire grown layer. These are considered to be the cause of the poor component properties compared to the components produced on hexagonal 4H or 6H SiC.
- epitaxial layers Semiconductor layers (hereinafter referred to as epitaxial layers) on silicon substrates are known, in which the surface of the respective epitaxial layer is irradiated over the entire area with a light pulse.
- This process creates a complex SiC / Si heterostructure in which the SiC layer consists of two regions of different crystalline quality, namely an upper one of poor quality and a lower one - directly on the silicon - of good quality with regard to the level of the defect density. Therefore, the advantage of the qualitatively better area of the SiC layer cannot be used directly for further growth. There is also considerable ripple in the layer. As a result, this complex heterostructure has a rough, uneven surface. Such inhomogeneities make in
- the invention has for its object to provide a method by which it is possible to make the desired properties of the semiconductor substrates treated with light pulses available in the lower layer mentioned usable for the further process and to reduce the ripple of the layer or even to avoid it entirely , Furthermore, the invention is based on the object of specifying a semiconductor substrate and a semiconductor component with a heteroepitaxially grown semiconductor layer with improved properties.
- the object is achieved by a method for treating a semiconductor substrate with the features of claim 1 or a semiconductor substrate with the features of claim 20 and a semiconductor component with the features of claim 21.
- Advantageous embodiments of the method are the subject of the respective subclaims.
- the method according to the invention is based on the basic idea of applying at least one auxiliary layer before the heat treatment in addition to the heat treatment already described in DE 101 27 073 A1 and removing it again after the heat treatment.
- the method comprises: (i) the deposition of a first auxiliary layer (hereinafter referred to as the intermediate layer) of a suitable material on the substrate, (ii) then the deposition of a further auxiliary layer (hereinafter referred to as the cover layer), and
- the auxiliary layer system can also consist of one or three or more layers of appropriate thickness or composition. It is also essential that the substrates are cleaned before the layer deposition or between the corresponding depositions. Likewise, the auxiliary layer system should be removed using suitable chemical and / or physical methods without impairing the properties of the SiC layer. DESCRIPTION OF A PREFERRED EMBODIMENT
- a commercial, (100) -oriented Si substrate is treated with standard chemical cleaning that is common in the semiconductor industry to produce a clean surface. This can e.g. include rinsing in methanol and an HF dip to remove the natural oxide layer.
- the formation of cavities at the 3C-SiC-Si interface is avoided by first introducing propane into the reactor and then heating the substrate at 8K / s. After carbonation is complete, the temperature is raised to 1350 ° C. at a heating rate of 4.5 K / s.
- silane is introduced into the reactor to perform the 3C-SiC epitaxial growth.
- the thickness of the layer thus grown is usually below 50 nm and typically 35 nm.
- An intermediate layer of polycrystalline, amorphous or defect-rich single-crystal silicon is then deposited on the 3C-SiC layer according to (b).
- the Si layer can be grown in the same CVD reactor as the 3C-SiC layer using silane gas at a temperature of 1000 ° C. According to the invention, the thickness of the Si layer should be in the range 0.1-1 ⁇ m.
- a thin covering layer of SiC, SiO 2 or SiO x N ⁇ is then deposited on the intermediate layer according to (c), the general formula SiO x N ⁇ denoting the oxynitrides of silicon and here X and Y numbers between 0 and 2 (including fractions such as 0.5). The thickness of this layer should be in the range of 20 to 50 nm.
- the typical process conditions with which the present invention is applied are as follows:
- the duration of the light pulse which is realized by means of xenon lamps, is in the range of 1-100 ms.
- a process with a pulse duration of 20 ms is preferably used.
- the energy density must be sufficiently high to achieve the required effect, typically 50-200 J / cm 2 .
- a value of 100 J / cm 2 should preferably be used.
- Preheating is carried out using a bank of halogen lamps.
- the preheating temperature range should be between 200 ° and 2000 ° C. A preferred value is 800 ° C.
- the entire annealing process takes place in an inert atmosphere at normal pressure, preferably in argon gas.
- cover layer and the intermediate layer are removed by a suitable physical and / or chemical etching procedure in order to expose the 3C-SiC layer produced with improved quality.
- a suitable physical and / or chemical etching procedure in order to expose the 3C-SiC layer produced with improved quality.
- wet chemical etching or reactive ion etching is used.
- the deposited SiC layer contains microstructural defects of high density, the cause of which lies essentially in the high lattice mismatch of approximately 20% between Si and 3S-SiC. For example, studies have shown that the dislocation density is close to the
- Interface SiC / Si is in the range from 1 ⁇ 10 11 to 1 10 12 cm "2.
- An additional stress in the interface region is brought about by the difference in the thermal expansion coefficients of the two materials.
- a direct treatment of the deposited 3C-SiC layer with a high defect density according to (b) with the heat treatment according to (e) without the prior deposition of the additional layers according to (c) and (d), as described in DE 101 27 073 A1 leads to a significant reduction in both the dislocation density and the accumulated tensions, but has two unwanted ones
- the 3C-SiC layer consists of two zones of clearly different crystalline quality, the near-surface part being of poorer quality than the near-substrate part; on the other hand, the buckling effect (generation of a layer ripple) is shown to be unavoidable, although the stresses after the heat treatment according to (e) have been significantly reduced.
- a preheating step for heating the substrate to a selected temperature, e.g. with a halogen lamp bank for a period of time which is sufficient for thermal equilibrium to be reached and thus to avoid thermal shock during the actual light pulse annealing;
- preheating the assembly to a certain temperature is an essential part of the annealing process. As soon as the temperature of the arrangement reaches the required value, the flash lamps are activated, a light pulse produce. This then leads to a temperature jump on the top of the arrangement.
- the light pulse generated by the xenon lamp arrangement is directed onto the substrate material, irradiates its near surface and selectively influences regions located therein.
- the energy deposited by the light pulse leads to an extremely fast thermal process on the top of the substrate, whereby high temperatures for effective periods of time in the millisecond range are reached in the processed region until the thermal compensation has taken place after the end of the light pulse.
- the intermediate layer consisting of Si is melted and brought into the liquid state.
- the upper part of the thin 3C-SiC layer is then dissolved and, with the end of the light pulse, is cooled, causing the liquid to solidify
- a controlled directed and selective melting of the layer can be achieved by appropriate selection of the parameters of the heat treatment.
- the resulting thin SiC layer with significantly improved quality can serve as a seed for the further epitaxial growth of a thick (up to 10 ⁇ m) 3C-SiC layer.
- the possibility of producing such layers in turn simplifies the development of (100) -oriented 3C-SiC substrates.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Chemical Vapour Deposition (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10344986A DE10344986B4 (de) | 2003-09-27 | 2003-09-27 | Verfahren zur Erzeugung verbesserter heteroepitaktischer gewachsener Siliziumkarbidschichten auf Siliziumsubstraten |
| PCT/DE2004/002153 WO2005031825A1 (de) | 2003-09-27 | 2004-09-27 | Verfahren zur behandlung heteroepitaktisch gewachsener halbleiterschichten auf halbleitersubstraten, halbleitersubstrat mit einer behandelten halbleiterschicht und halbleiterbauelement aus einem solchen halbleitersubstrat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1665350A1 true EP1665350A1 (de) | 2006-06-07 |
Family
ID=34384315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04786866A Withdrawn EP1665350A1 (de) | 2003-09-27 | 2004-09-27 | Verfahren zur behandlung heteroepitaktisch gewachsener halbleiterschichten auf halbleitersubstraten, halbleitersubstrat mit einer behandelten halbleiterschicht und halbleiterbauelement aus einem solchen halbleitersubstrat |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1665350A1 (de) |
| DE (1) | DE10344986B4 (de) |
| WO (1) | WO2005031825A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3279842D1 (en) * | 1981-04-16 | 1989-08-31 | Massachusetts Inst Technology | Lateral epitaxial growth by seeded solidification |
| US5306662A (en) * | 1991-11-08 | 1994-04-26 | Nichia Chemical Industries, Ltd. | Method of manufacturing P-type compound semiconductor |
| JP4406995B2 (ja) * | 2000-03-27 | 2010-02-03 | パナソニック株式会社 | 半導体基板および半導体基板の製造方法 |
| US20020157596A1 (en) * | 2001-04-30 | 2002-10-31 | Stockman Stephen A. | Forming low resistivity p-type gallium nitride |
| US6653166B2 (en) * | 2001-05-09 | 2003-11-25 | Nsc-Nanosemiconductor Gmbh | Semiconductor device and method of making same |
| DE10127073A1 (de) * | 2001-06-02 | 2002-12-12 | Rossendorf Forschzent | Verfahren zur Behandlung heteroepitaktischer Halbleiterschichten auf Siliziumsubstraten |
| US20030015760A1 (en) * | 2001-07-20 | 2003-01-23 | Motorola, Inc. | Structure and process for fabricating semiconductor structures and devices utilizing the formation of a compliant substrate for materials used to form the same including a combined anneal of CMOS and compound semiconductor regions |
-
2003
- 2003-09-27 DE DE10344986A patent/DE10344986B4/de not_active Expired - Fee Related
-
2004
- 2004-09-27 WO PCT/DE2004/002153 patent/WO2005031825A1/de not_active Ceased
- 2004-09-27 EP EP04786866A patent/EP1665350A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005031825A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005031825A1 (de) | 2005-04-07 |
| DE10344986B4 (de) | 2008-10-23 |
| DE10344986A1 (de) | 2005-04-28 |
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