DE1153908B - Method and device for crucible-free zone melting with changing the spacing of the rod ends - Google Patents
Method and device for crucible-free zone melting with changing the spacing of the rod endsInfo
- Publication number
- DE1153908B DE1153908B DES57931A DES0057931A DE1153908B DE 1153908 B DE1153908 B DE 1153908B DE S57931 A DES57931 A DE S57931A DE S0057931 A DES0057931 A DE S0057931A DE 1153908 B DE1153908 B DE 1153908B
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- Prior art keywords
- rod
- coil
- semiconductor
- current
- high frequency
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/80—Solid-state polycondensation
-
- 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
- C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
- C30B13/28—Controlling or regulating
- C30B13/30—Stabilisation or shape controlling of the molten zone, e.g. by concentrators, by electromagnetic fields; Controlling the section of the crystal
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/22—Furnaces without an endless core
- H05B6/30—Arrangements for remelting or zone melting
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1004—Apparatus with means for measuring, testing, or sensing
- Y10T117/1008—Apparatus with means for measuring, testing, or sensing with responsive control means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1076—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone
- Y10T117/1084—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone having details of a stabilizing feature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1076—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone
- Y10T117/1088—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone including heating or cooling details
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Silicon Compounds (AREA)
- General Induction Heating (AREA)
Description
Die Erfindung bezieht sich auf ein Verfahren zum tiegellosen Zonenschmelzen eines an seinen Enden gehalterten Stabes aus Halbleitergrundstoff, insbesondere aus hochreinem Silizium, bei dem eine mittels induktiver Erhitzung durch eine Hochfrequenzspule erzeugte Schmelzzone zwischen den beiden gehalterten Enden des Stabes in Richtung der Stabachse entlanggeführt und der Schmelzzonenquerschnitt durch Abstandsänderung eines Stabendes beeinflußt wird, insbesondere zur Herstellung eines einkristallinen Halbleiterstabes. The invention relates to a method for crucible-free zone melting of a rod made of semiconductor base material, held at its ends, in particular made of high-purity silicon, one of which is inductive heating by a high-frequency coil The melt zone generated between the two supported ends of the rod is guided along in the direction of the rod axis and the melt zone cross section is influenced by a change in the distance of a rod end, in particular for the production of a monocrystalline semiconductor rod.
Es ist bereits ein Zonenschmelzverfahren bekannt, bei dem zum Herstellen eines dünnen Halbleiterstabes aus einem relativ dicken Halbleiterstab beim Zonenschmelzen die Stabenden während des Ziehvorgangs auseinanderbewegt werden.There is already known a zone melting method in which to manufacture a thin semiconductor rod from a relatively thick semiconductor rod during zone melting, the rod ends during the drawing process be moved apart.
Demgegenüber ist es der Grundgedanke der vorliegenden Erfindung, ein Verfahren und eine Vorrichtung anzugeben, um beim tiegellosen Zonenziehen einen einkristallinen Halbleiterstab definierter, d. h. in einem gewünschten Bereich gleichbleibender Dicke herzustellen. Erfindungsgemäß wird der von einer Hochfrequenzstromquelle in die den Halbleiterstab umgebende Spule eingespeiste Strom, der sich bei sich ändernder Dicke des Stabes ebenfalls ändert, zur Steuerung einer Einrichtung verwendet, die den Abstand der Halterungen des Halbleiterstabes zu ändern in der Lage ist, wobei diese Einrichtung die beiden Halterungen einander nähert bzw. voneinander entfernt, bis der Strom in der Hochfrequenzspule wieder den gewünschten Wert hat.In contrast, it is the basic idea of the present invention, a method and an apparatus specify in order to create a monocrystalline semiconductor rod in a more defined, d. H. in to produce a desired area of constant thickness. According to the invention of a High-frequency current source fed into the coil surrounding the semiconductor rod, which is in itself Changing the thickness of the rod also changes, used to control a device that adjusts the distance of the holders of the semiconductor rod is able to change, this device the two Mounts approaching each other or moving away from each other until the current in the high frequency coil returns has the desired value.
Diese Hochfrequenzspule ist dabei sehr kurz gegenüber der Länge des Halbleiterstabes. Es ist zweckmäßig, aber nicht unbedingt notwendig, daß die zur Steuerung der Dicke des Halbleiterstabes verwendete Hochfrequenzspule gleichzeitig die Schmelzzone aufheizt. Gegebenenfalls kann für die Dickenregelung auch eine eigene Spule, die von einem gesonderten Hochfrequenzgenerator gespeist wird, vorgesehen sein.This high-frequency coil is very short compared to the length of the semiconductor rod. It is appropriate but not essential that the one used to control the thickness of the semiconductor rod The high-frequency coil simultaneously heats the melting zone. If necessary, it can be used for thickness control a separate coil, which is fed by a separate high-frequency generator, can also be provided.
Die Erfindung und weitere Einzelheiten sollen durch die nun folgende Beschreibung der Figuren näher erläutert werden.The invention and further details are to be explained in more detail by the description of the figures which now follows explained.
An Hand der Fig. 1 soll zunächst der prinzipielle Vorgang der Dickenregelung beschrieben werden. 1 ist ein Halbleiterstab, z. B. aus Silizium, der an seinen beiden Enden 2 und 3 gehaltert ist. Im Ausführungsbeispiel dient die Hochfrequenzspule 5 zugleich zur Aufheizung der Zone 4. Diese ganze Anordnung befindet sich in einem hier nicht gezeichneten Quarzrohr in einer Schutzgasatmosphäre. Um die Schmelzzone zu vergrößern, kann auch noch zusätzlich eine Stützfeldspule vorgesehen sein. Stützfeldspule und Hoch-Verfahren und VorrichtungWith reference to Fig. 1, the basic process of the thickness control will first be described. 1 is a semiconductor rod, e.g. B. made of silicon, which is held at both ends 2 and 3. In the exemplary embodiment, the high-frequency coil 5 also serves to Heating of zone 4. This entire arrangement is located in a quartz tube (not shown here) in a protective gas atmosphere. A support field coil can also be used to enlarge the melting zone be provided. Support field coil and high method and device
zum tiegellosen Zonenschmelzenfor crucible zone melting
mit Abstandsänderung der Stabendenwith a change in the distance between the rod ends
Anmelder:Applicant:
Siemens & Halske Aktiengesellschaft,Siemens & Halske Aktiengesellschaft,
Berlin und München,
München 2, Witteisbacherplatz 2Berlin and Munich,
Munich 2, Witteisbacherplatz 2
Dr. Theodor Rummel, München,Dr. Theodor Rummel, Munich,
Hans-Friedr. Quast, Freiburg (Breisgau),Hans-Friedr. Quast, Freiburg (Breisgau),
und Dr. Wolfgang Keller, Pretzfeld (QFr.),and Dr. Wolfgang Keller, Pretzfeld (QFr.),
sind als Erfinder genannt wordenhave been named as inventors
frequenzspule 5 sind so angeordnet, daß sie mit vorgegebener Geschwindigkeit am Stab entlanggeführt werden können. Wird die Schmelzzone z. B. in der durch den Pfeil 18 angedeuteten Richtung geführt, so wird erfindungsgemäß die Vorrichtung zum Stauchen und Strecken des Stabes während des Zonenziehens an dem mit 2 bezeichneten Ende des Halbleiterstabes angeordnet. Allgemein ist sie immer an dem Ende des Stabes angeordnet, das zuletzt erstarrt, da dann die durch das Stauchen und Ziehen des Stabes eventuell auftretenden Fehler im Kristallgitter durch die nachfolgende Schmelzzone beseitigt werden können, so daß Stäbe mit guter Kristallperfektion erhalten werden.frequency coils 5 are arranged so that they are guided along the rod at a predetermined speed can be. If the melting zone z. B. out in the direction indicated by arrow 18, so According to the invention, the device for upsetting and stretching the rod during the zone drawing arranged at the end of the semiconductor rod denoted by 2. Generally it is always at the end of the rod arranged, which solidifies last, because then the by compressing and pulling the rod possibly Any defects that occur in the crystal lattice can be eliminated by the subsequent melting zone, so that rods with good crystal perfection are obtained.
Zur Kompensation des induktiven Blindwiderstandes der Spule 5 kann z. B. ein Kondensator 6 der Hochfrequenzspule parallel geschaltet werden. Das hat den Vorteil, daß der Hochfrequenzgenerator 7 nur den durch die Heizleistung sowie durch die ohmschen Verluste von Spule 5 und Kondensator 6 bedingten Wirkstrom abgeben muß, der viel kleiner ist als der durch die Spule fließende Blindstrom.To compensate for the inductive reactance of the coil 5, for. B. a capacitor 6 of the High frequency coil can be connected in parallel. This has the advantage that the high-frequency generator 7 only that caused by the heating power and the ohmic losses of coil 5 and capacitor 6 must deliver conditional active current, which is much smaller than the reactive current flowing through the coil.
Der durch die Spule 5 und den Kondensator 6 gebildete Schwingkreis, der gegen den inneren Sendeschwingkreis des Generators verstimmt ist, ist kapazitiv oder induktiv an den Sendeschwingkreis angekoppelt. Dabei ist die Ankopplung so lose, daß auchThe resonant circuit formed by the coil 5 and the capacitor 6, the one against the inner transmitter resonant circuit of the generator is out of tune, is capacitively or inductively coupled to the transmitter oscillating circuit. The coupling is so loose that also
309 670/243309 670/243
bei einer durch die Dickenänderung des Halbleiterstabes bedingten weiteren Verstimmung des Heizkreises das System Generator-Heizkreis auf einer Frequenz schwingt. ']'... In the event of a further detuning of the heating circuit caused by the change in thickness of the semiconductor rod, the generator-heating circuit system oscillates at one frequency. ']' ...
Durch den in der Spule 5 fließenden Hochfrequenzstrom wird in dem von der Spule umgebenden Teil des Halbleiterstabes eine Spannung induziert, die einen Strom hervorruft, dessen Magnetfeld dem von der Spule erzeugten entgegenwirkt. Man kann diesen Teil des Halbleiterstabes also mit einer Spulenwindung vergleichen. Bekanntlieh ist der Kopplungsfaktor solcher Spulenanordnungen eine Funktion der geometrischen Abmessungen der Spulen und dem Durchmesser der inneren Spule proportional. Ändert sich deshalb während der Durchführung des erfindungsgemäßen Verfahrens die Dicke des Halbleiterstabes, so ändert sich auch der Kopplungsfaktor und damit der zwischen den Klemmen 12 und 13 gemessene Widerstand Zn des Heizkreises. Diese Belastungsänderung wirkt sich in einer Anodenstromänderung, die durch das Instrument 8 angezeigt wird, aus. Einer bestimmten Dicke des Stabes entspricht also ein ganz bestimmter'Wert des Anodenstromes. Der Widerstand 9 wird nün.zu Beginn des erfindungsgemäßen Verfahrens so eingestellt, daß ein Anodenstrom, wie er der gewünschten Dicke entspricht, an diesem Widerstand einen Spannungsabfall hervorruft, der gleich der von der Batterie 10 abgegebenen Spannung ist, so daß das; gepolte Relais 11 in Ruhestellung 15 liegt. Ändert sich nun im Verlauf des Verfahrens die Dicke des Halbleiterstabes und damit der Anodenstrom des Generators, so zieht das Relais an und schließt, je nachdem, in welcher Richtung die Stromänderung erfolgt; den Kontakt 16 oder 17. Durch Schließen eines dieser Kontakte wird durch einen Motor 21 über, ein nicht eingezeichnetes Getriebe das Zahnrad 19 entlang der Zahnstange 20 in Bewegung gesetzt und der Halbleiterstab abhängig von der Drehrichtung des Zahnrades gestreckt oder gestaucht.The high-frequency current flowing in the coil 5 induces a voltage in the part of the semiconductor rod surrounding the coil, which voltage causes a current whose magnetic field counteracts the one generated by the coil. This part of the semiconductor rod can therefore be compared with a coil turn. As is known, the coupling factor of such coil assemblies is proportional to a function of the geometric dimensions of the coils and the diameter of the inner coil. If, therefore, the thickness of the semiconductor rod changes while the method according to the invention is being carried out, the coupling factor and thus the resistance Z n of the heating circuit measured between terminals 12 and 13 also change. This change in load results in a change in the anode current, which is displayed by the instrument 8. A very specific value of the anode current corresponds to a certain thickness of the rod. The resistor 9 is set at the beginning of the method according to the invention in such a way that an anode current, as it corresponds to the desired thickness, causes a voltage drop across this resistor which is equal to the voltage output by the battery 10, so that the; polarized relay 11 is in the rest position 15. If the thickness of the semiconductor rod changes in the course of the process and thus the anode current of the generator changes, the relay picks up and closes, depending on the direction in which the current change occurs; the contact 16 or 17. By closing one of these contacts, the gear 19 is set in motion along the rack 20 by a motor 21 via a gear (not shown) and the semiconductor rod is stretched or compressed depending on the direction of rotation of the gear.
In der Fig. 2 ist die vom Generator abgegebene Leistung N in Abhängigkeit von dem Verhältnis von Belastungswiderstand ZH zum Ausgangswiderstand des Senders Z5 dargestellt. Die abgegebene Leistung ist bekanntlich bei Anpassung, d. h. Zn = Z5, am größten. Bei dem durch die Erfindung vorgeschlagenen Verfahren wird der Belastungswiderstand Zn z. B. so gewählt, daß bei derjenigen Dicke des Halbleiterstabes, die durch die Regelung beibehalten werden soll, die vom Generator abgegebene Leistung etwa der im Punkte entspricht, also im steigenden Ast der Kurve gearbeitet wird. Aus dem bereits weiter oben Ausgeführten ergibt sich, daß für einen dünner werdenden Stab der Kopplungsfaktor kleiner, d.h. die Kopplung zwischen der Hochfrequenzspule und dem durch eine Spulenwindung versinnbildlichten TeE des Halbleiterstabes loser wird und damit Zn größer. Aus dem Diagramm der Fig. 2 kann man entnehmen, daß die Anpassung dann besser wird, d. h. die abgegebene Leistung und deshalb auch der Anodenstrom ansteigt. Wird umgekehrt der Halbleiterstab dicker, also die Kopplung fester, so wird Zn kleiner und der Anodenstrom ebenfalls.In FIG. 2, the power N delivered by the generator is shown as a function of the ratio of load resistance Z H to the output resistance of transmitter Z 5 . As is well known, the output power is greatest with adaptation, ie Z n = Z 5. In the method proposed by the invention, the load resistance Z n z. B. chosen so that with that thickness of the semiconductor rod that is to be maintained by the control, the power output by the generator corresponds approximately to that in the point, so work is carried out in the rising branch of the curve. From what has already been stated above, it follows that for a rod that is becoming thinner, the coupling factor becomes smaller, ie the coupling between the high-frequency coil and the TeE of the semiconductor rod symbolized by a coil turn becomes looser and thus Z n becomes larger. From the diagram in FIG. 2 it can be seen that the adaptation then becomes better, ie the output power and therefore also the anode current increases. Conversely, if the semiconductor rod becomes thicker, i.e. the coupling becomes stronger, then Z n becomes smaller and so does the anode current.
Der Belastungswiderstand Zn kann auch so gewählt werden, daß im abfallenden Kurvenast, also etwa im Punkt B gearbeitet wird, d.h. daß bei dünner werdendem Stab, also anwachsendem Zn, die vom Generator abgegebene Leistung N- und damit der Anodenstrom kleiner wird. Um zu erreichen, daß die Dickenregelung in der gewünschten Richtung erfolgt, muß dann das Relais 11 gegenüber dem Verfahren, bei dem der Arbeitspunkt im steigenden Kurvenast, also etwa bei A liegt, gerade umgekehrt gepolt werden.The load resistance Z n can also be chosen so that work is carried out in the sloping branch of the curve, i.e. approximately at point B , that is, as the rod becomes thinner, i.e. increasing Z n , the power N- and thus the anode current output by the generator decrease. In order to ensure that the thickness control takes place in the desired direction, the relay 11 must then be polarized in the opposite way to the method in which the operating point is in the rising branch of the curve, that is, approximately at A.
Liegt der Arbeitspunkt im steigenden Kurvenast, so steigt bei dünner werdendem Stab der durch das Instrument 8 angezeigte Anodenstrom an. Das Relais 11 muß so gepolt sein, daß es z. B. den Kontakt 16 schließt, wodurch eine Drehung des Motors 21 bedingt ist, die das Zahnrad 19 in Richtung des Pfeiles 22 bewegt, so daß der Halbleiterstab gestaucht wird, d. h. daß sich die beiden Enden 2 und 3 einander nähern, und zwar so lange, bis der Anodenstrom wieder den gewünschten Wert hat und das Relais 11 wieder in die Ruhestellung 15 abfällt.If the working point is in the rising branch of the curve, then as the rod becomes thinner, the through the increases Instrument 8 displays anode current. The relay 11 must be polarized so that it is z. B. contact 16 closes, whereby a rotation of the motor 21 is caused, which the gear 19 in the direction of the arrow 22 moved so that the semiconductor rod is upset, i.e. H. that the two ends 2 and 3 are mutually exclusive approach until the anode current has the desired value again and the relay 11 falls back into the rest position 15.
Bei dicker werdendem Stab wird der Anodenstrom kleiner, das Relais 11 schließt z. B. den Kontakt 17, wodurch der Motor 21 das Zahnrad in Richtung des Pfeiles 23 in Drehung versetzt, so daß der Halbleiterstab so lange gestreckt wird, bis der Anodenstrom sich wieder auf den gewünschten Wert einstellt und somit das Relais 11 abfällt.As the rod becomes thicker, the anode current becomes smaller, the relay 11 closes z. B. contact 17, whereby the motor 21 sets the gear in the direction of arrow 23 in rotation, so that the semiconductor rod is stretched until the anode current returns to the desired value and thus the relay 11 drops out.
Um bei diesem erfindungsgemäßen Verfahren die Dicke des Halbleiterstabes während des Ziehens zu verändern, wird z. B. zwischen die Klemmen 12 und 13 das in Fig. 3 dargestellte Heizsystem geschaltet. Zusätzlich zur Hochfrequenzspule 24, die den Halbleiterstab 1 umgibt, ist eine zweite Spule 25 in Reihe geschaltet. Der Blindwiderstand dieser beiden Spulen kann z. B. wieder durch einen Kondensator 26 kompensiert werden. Beispielsweise durch Eintauchen bzw. Herausziehen eines Metallkörpers 27 kann die Induktivität der Spule 25 verändert werden und damit der zwischen den Klemmen 12 und 13 wirksame Belastungswiderstand des Systems, d.h. der Anodenstrom bzw. die Dicke des Halbleiterstabes.In order to increase the thickness of the semiconductor rod during the drawing in this method according to the invention change, z. B. between the terminals 12 and 13, the heating system shown in Fig. 3 is connected. Additionally to the high-frequency coil 24, which surrounds the semiconductor rod 1, is a second coil 25 in series switched. The reactance of these two coils can, for. B. compensated again by a capacitor 26 will. For example, by immersing or pulling out a metal body 27, the The inductance of the coil 25 can be changed and thus the load resistance effective between the terminals 12 and 13 of the system, i.e. the anode current or the thickness of the semiconductor rod.
Claims (8)
Deutsche Patentanmeldung S 36 998 VIIIc/21g (bekanntgemacht am 23. 6. 1955).Considered publications:
German patent application S 36 998 VIIIc / 21g (published on June 23, 1955).
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES57931A DE1153908B (en) | 1958-04-22 | 1958-04-22 | Method and device for crucible-free zone melting with changing the spacing of the rod ends |
US806174A US2913561A (en) | 1958-04-22 | 1959-04-13 | Processing semiconductor rods |
CH7213259A CH373903A (en) | 1958-04-22 | 1959-04-16 | Process for crucible-free zone pulling of semiconductor material |
GB13710/59A GB900545A (en) | 1958-04-22 | 1959-04-22 | Improvements in or relating to semi-conductor rods |
FR792841A FR1222189A (en) | 1958-04-22 | 1959-04-22 | Stretching process for semiconductors |
BE578011A BE578011A (en) | 1958-04-22 | 1959-04-22 | Semiconductor stretching process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES57931A DE1153908B (en) | 1958-04-22 | 1958-04-22 | Method and device for crucible-free zone melting with changing the spacing of the rod ends |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1153908B true DE1153908B (en) | 1963-09-05 |
Family
ID=7492176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES57931A Pending DE1153908B (en) | 1958-04-22 | 1958-04-22 | Method and device for crucible-free zone melting with changing the spacing of the rod ends |
Country Status (6)
Country | Link |
---|---|
US (1) | US2913561A (en) |
BE (1) | BE578011A (en) |
CH (1) | CH373903A (en) |
DE (1) | DE1153908B (en) |
FR (1) | FR1222189A (en) |
GB (1) | GB900545A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1519912B1 (en) * | 1963-10-15 | 1970-06-18 | Texas Instruments Inc | Process for the production of dislocation-free, single-crystal semiconductor material |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL113496C (en) * | 1959-06-12 | |||
NL135666C (en) * | 1959-08-17 | |||
DE1115680B (en) * | 1960-06-27 | 1961-10-26 | Hans Laske | Process for the production of very thin metal moldings |
GB904100A (en) * | 1959-09-11 | 1962-08-22 | Siemens Ag | A process for zone-by-zone melting of a rod of semi-conductor material using an induction coil as the heating means and an automatic arrangement for controlling the current through the coil |
GB977591A (en) * | 1960-01-20 | |||
US2992311A (en) * | 1960-09-28 | 1961-07-11 | Siemens Ag | Method and apparatus for floatingzone melting of semiconductor rods |
US3136876A (en) * | 1960-10-26 | 1964-06-09 | Clevite Corp | Indicator and control system |
NL129916C (en) * | 1961-02-07 | |||
DE1222476B (en) * | 1961-03-09 | 1966-08-11 | Siemens Ag | Method for producing elongated, in particular dendritic semiconductor bodies by drawing from a melt |
NL300759A (en) * | 1962-12-07 | |||
DE1198324B (en) * | 1963-09-06 | 1965-08-12 | Siemens Ag | Process for crucible-free zone melting |
US3428436A (en) * | 1963-12-16 | 1969-02-18 | Monsanto Co | Methods and apparatus for zone melting |
US3321299A (en) * | 1964-10-13 | 1967-05-23 | Monsanto Co | Apparatus and process for preparing semiconductor rods |
GB2146186A (en) * | 1983-08-25 | 1985-04-11 | Electroheating Int | Apparatus for electrically heating a metallic workpiece |
-
1958
- 1958-04-22 DE DES57931A patent/DE1153908B/en active Pending
-
1959
- 1959-04-13 US US806174A patent/US2913561A/en not_active Expired - Lifetime
- 1959-04-16 CH CH7213259A patent/CH373903A/en unknown
- 1959-04-22 FR FR792841A patent/FR1222189A/en not_active Expired
- 1959-04-22 GB GB13710/59A patent/GB900545A/en not_active Expired
- 1959-04-22 BE BE578011A patent/BE578011A/en unknown
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1519912B1 (en) * | 1963-10-15 | 1970-06-18 | Texas Instruments Inc | Process for the production of dislocation-free, single-crystal semiconductor material |
Also Published As
Publication number | Publication date |
---|---|
US2913561A (en) | 1959-11-17 |
FR1222189A (en) | 1960-06-08 |
BE578011A (en) | 1959-08-17 |
CH373903A (en) | 1963-12-15 |
GB900545A (en) | 1962-07-04 |
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