DE895339C - Electrical semiconductor made from selenium, especially for dry rectifiers - Google Patents
Electrical semiconductor made from selenium, especially for dry rectifiersInfo
- Publication number
- DE895339C DE895339C DES8687D DES0008687D DE895339C DE 895339 C DE895339 C DE 895339C DE S8687 D DES8687 D DE S8687D DE S0008687 D DES0008687 D DE S0008687D DE 895339 C DE895339 C DE 895339C
- Authority
- DE
- Germany
- Prior art keywords
- selenium
- addition
- electrical semiconductor
- metals
- tellurium
- 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.)
- Expired
Links
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 title claims description 47
- 239000011669 selenium Substances 0.000 title claims description 47
- 229910052711 selenium Inorganic materials 0.000 title claims description 47
- 239000004065 semiconductor Substances 0.000 title claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 229910052714 tellurium Inorganic materials 0.000 claims description 11
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 9
- VIEXQFHKRAHTQS-UHFFFAOYSA-N chloroselanyl selenohypochlorite Chemical compound Cl[Se][Se]Cl VIEXQFHKRAHTQS-UHFFFAOYSA-N 0.000 claims description 9
- 229910052785 arsenic Inorganic materials 0.000 claims description 8
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 8
- 150000002739 metals Chemical class 0.000 claims description 8
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 7
- RTZRJSLZUINFDV-UHFFFAOYSA-N [Cl].[Se] Chemical compound [Cl].[Se] RTZRJSLZUINFDV-UHFFFAOYSA-N 0.000 claims description 6
- 229910052684 Cerium Inorganic materials 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 5
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 5
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 claims description 5
- 229910052787 antimony Inorganic materials 0.000 claims description 4
- 229910052797 bismuth Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052716 thallium Inorganic materials 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- RFUAMROIJXRZGD-UHFFFAOYSA-N [Br].[Se] Chemical compound [Br].[Se] RFUAMROIJXRZGD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- CXMYWOCYTPKBPP-UHFFFAOYSA-N 3-(3-hydroxypropylamino)propan-1-ol Chemical compound OCCCNCCCO CXMYWOCYTPKBPP-UHFFFAOYSA-N 0.000 claims 2
- 238000007792 addition Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 150000003346 selenoethers Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/06—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising selenium or tellurium in uncombined form other than as impurities in semiconductor bodies of other materials
- H01L21/08—Preparation of the foundation plate
-
- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/06—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising selenium or tellurium in uncombined form other than as impurities in semiconductor bodies of other materials
- H01L21/10—Preliminary treatment of the selenium or tellurium, its application to the foundation plate, or the subsequent treatment of the combination
-
- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/06—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising selenium or tellurium in uncombined form other than as impurities in semiconductor bodies of other materials
- H01L21/10—Preliminary treatment of the selenium or tellurium, its application to the foundation plate, or the subsequent treatment of the combination
- H01L21/103—Conversion of the selenium or tellurium to the conductive state
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12528—Semiconductor component
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electrodes Of Semiconductors (AREA)
- Elimination Of Static Electricity (AREA)
- Light Receiving Elements (AREA)
- Photovoltaic Devices (AREA)
- Catalysts (AREA)
- Thermistors And Varistors (AREA)
Description
Elektrisdier Halbleiter aus Selen, insbesondere für Trockengleidirichter Die Erfahrung lehrt, daß die handelsüblichen Selensorten, auch die reinen oder reinsten, eine für Gleichrichterzwecke viel zu geringe Leitfähigkeit aufweisen.Electrifying semiconductors made of selenium, in particular for dry levelers Experience shows that the commercially available selenium varieties, even the pure or purest, have a conductivity that is far too low for rectification purposes.
Das Patent 742 935 zeigt einen Weg, diesen Mangel zu beseitigen, indem man dem Selen einen Zusatz von Selenchlorür oder Selenbromür oder von beiden gibt bzw. von einem Stoff, der durch chemische Reaktion mit dem Selen Selenchlorür oder Selenbromür bildet. Man erreicht auf diese Weise eine Herabsetzung des spezifischen Widerstandes des Selens von etwa io 7 auf etwa iol Ohm - cm.The patent 742 935 shows a way to eliminate this deficiency by adding the selenium addition of Selenchlorür or Selenbromür or both or forms of a substance by chemical reaction with the selenium or Selenchlorür Selenbromür. In this way, the specific resistance of selenium is reduced from about 10 7 to about 10 ohm - cm.
Die Erfindung betrifft eine weitere Ausgestaltung und Verbesserung des im Patent 742 935 beschriebenen Verfahrens mit dem Ziel, eine noch stärkere Herabsetzung des spezifischen Widerstandes des Selens zu erlangen. Man erreicht dies dadurch, daß das Selen außer der im Hauptpatent beschriebenen Beimischung von Selenchlorür und/oder Selenbromür noch weitere Zusätze, insbesondere in elementarer Form, eines oder mehrerer Metalle, insbesondere Antimon, Wismut, Zinn, Tellur, Thallium, Cer oder Eisen, zweckmäßig in einer Gesamtmenge von o,oi bis ill/" enthält.The invention relates to a further embodiment and improvement of the method described in patent 742 935 with the aim of achieving an even greater reduction in the specific resistance of selenium. This is achieved in that the selenium, in addition to the admixture of selenium chlorine and / or selenium bromine described in the main patent, also has other additives, especially in elemental form, one or more metals, especially antimony, bismuth, tin, tellurium, thallium, cerium or iron, expediently in a total of o, oi to ill / ".
Die günstige Wirkung der Beimengung der genannten Elemente zu selenchlorür- oder selenbrornür--haltigem Selen ist um so überraschender, als festgestellt werden konnte, daß umgekehrt Selensorten, die keinen Zusatz von Selenchlorür oder Selenbromür enthalten, aber durch eines oder mehrere der genannten Metalle oder durch Kupfer, Kadmium oder Blei oder auch durch Arsen verunreinigt sind, eine wesentlich geringere Leitfähigkeit aufweisen als ohne diese Verunreinigungen. Allgemein kann man sagen, daß zunächst jeder derartige Zusatz den spezifischen Widerstand selenchlorür- oder selenbromürfreien Selens ganz beträchtlich erhöht.The beneficial effect of adding the elements mentioned to selenium chloride or selenium containing selenium is all the more surprising when it has been found will Could that, conversely, selenium varieties that do not contain any added selenium chlorine or selenium bromine contained, but by one or more of the metals mentioned or by copper, Cadmium or lead, or even arsenic contaminated, is much lower Have conductivity than without these impurities. Generally one can say that first of all such additions the resistivity selenchlorur or selenium bromurefree selenium is increased considerably.
Technisch besonders wichtig ist der schädliche Einfluß des Tellurs als Verunreinigung des Selens bereits in kleinsten Mengen. Tellur und Selen kommen nämlich fast immer gleichzeitig in der Natur vor, zudem sind sie chemisch so eng miteinander verwandt, daß sie sich schwer trennen lassen. Ein Tellurzusatz von 0,03 % erhöht den Widerstand des Selens auf das Fünffache, ein solcher von 0,3 "/, auf das Sechsunddreißigfache.The harmful influence of tellurium as an impurity in selenium is particularly important from a technical point of view, even in very small quantities. Tellurium and selenium almost always occur in nature at the same time, and they are so closely related chemically that they are difficult to separate. A tellurium addition of 0.03% increases the resistance of selenium five times, and that of 0.3 "/ thirty-six times.
Neben Tellur ist Arsen die häufigste Verunreinigung des handelsüblichen Selens. Arsen wirkt sich als Zusatz noch ungünstiger aus als Tellur. 0,03 % Arsen erhöhen den spezifischen Widerstand des Selens von etwa 5oo auf 5o ooo Ohm - cm, 0,3 % Arsen sogar auf 5oo ooo Ohm - cm, während eine Schmelze mit 39, Arsen in endlicher Zeit überhaupt nicht zur KristaHisation zu bringen ist. Wie man sieht, machen also schon Spuren von Verunreinigungen das Selen für Trockengleichrichter praktisch unverwendbar.Besides tellurium, arsenic is the most common contaminant in commercial selenium. As an additive, arsenic has an even less favorable effect than tellurium. 0.03% arsenic increases the specific resistance of selenium from about 5oo to 50,000 ohm - cm, 0.3% arsenic even to 500,000 ohm - cm, while a melt with 39, arsenic cannot crystallize at all in a finite time is. As you can see, even traces of impurities make the selenium practically unusable for dry rectifiers.
Man kann das gleichzeitige Vorhandensein der vorstehend genannten Elemente und des Selenchlorürs bzw. -bromürs im Selen entweder dadurch erreichen, daß man einem gemäß dem Hauptpatent bereits mit Selenchlorür oder -bromürzusatz versehenen, im übrigen sehr reinen Selen eines oder mehrere der genannten Elemente beimischt oder auch dadurch, daß man umgekehrt einem Selen von verhältnismäßig geringer Leitfähigkeit, das durch eines oder mehrere dieser Elemente verunreinigt ist, durch Zusatz von Selenchlorür und/oder -bromür eine erheblich höhere Leitfähigkeit verleiht. In beiden Fällen erhält man ein wegen seiner hohen Leitfähigkeit zur Herstellung von Selengleichrichtern. in besonderem Grade geeignetes Selen.One can see the simultaneous presence of the above Elements and selenium chlorine or bromuric in selenium can either be achieved by that one according to the main patent already with selenium chlorine or bromuric additive provided, otherwise very pure selenium, one or more of the elements mentioned admixed or by conversely, a selenium of relatively less Conductivity contaminated by one or more of these elements Addition of selenium chlorine and / or bromine gives a considerably higher conductivity. In both cases, one gets one because of its high conductivity for manufacture of selenium rectifiers. particularly suitable selenium.
Im zuletzt genannten Falle erweist sich der Zusatz von Selenchlorär und/oder Selenbromür zu einem durch die genannten Elemente verunreinigten Selen als ein ausgezeichnetes Mittel, die vergiftenden Einflüsse derartiger Beimischungen zu einem Selen, das frei von Selenbromürzusätzen ist, unwirksam -zu machen, so daß nunmehr auch ein solches Selen zur Herstellung von Selengleichrichtern mit Vorteil verwendbar ist.In the latter case, the addition of Selenchlorär and / or admixtures such Selenbromür proves to be a contaminated by the said elements selenium as an excellent means of the poisoning effects to a selenium, which is free of Selenbromürzusätzen, -to make ineffective, so that now Such a selenium can also be used with advantage for the production of selenium rectifiers.
Einige Ergebnisse, die mit einem gemäß der Erfindung mit Zusätzen versehenen Selen erhalten wutden, sind in nachstehender Zahlentafel zusammengestellt. Diese Tafel bezieht sich auf Selen, das gemäß dem Hauptpatent mit 0,3 "/, (oder weniger) Selenchlorär vermengt ist und zwecks Umwandlung in die leitende Modifikation i Stunde lang auf 150 C erhitzt wurde.Some results which were obtained with a selenium provided with additives according to the invention are compiled in the table below. This table relates to selenium to the main patent of 0.3 "/, (or less) Selenchlorär is mixed and heated in accordance with the purpose of conversion in the conductive modification i hour at 150 C.
Während der spezifische Widerstand der in Rede stehenden Selensorte
ohne Metallzusätze 5oo Ohm - cm betrug, ergaben sich bei einem Zusatz von
o,3 "/, bzw. 0,03 % der nachstehend aufgeführten Metalle die angegebenen
Widerstandswerte.
Es kommt hinzu, daß die obengenannten Metallzusätze dem Selen eine weitere, bei der Herstellung von Selengleichrichtern besonders günstige Eigenschaft verleihen. Während man nämlich bei reinem Selen, um auf möglichst große Leitfähigkeit zu kommen, die Umwandlung von der amorphen in die kristaflinische Form bei etwa 2io' C vornehmen muß, erreichen die Selenchlorürhaltigen Selensorten, wenn sie einen oder mehrere der angegebenen Metallzusätze enthalten, den Höchstwert ihrer Leitfähigkeit bereits bei einer Umwandlungstemperatur von 150' C und dies noch dazu nach verhältnismäßig kurzer Behandlungsdauer. Die Vermeidung der hohen Umwandlungstemperatur wirkt sich insofern günstig auf den Selengleichrichter aus, als nunmehr an der Grenzschicht zwischen der Metallunterlage und dem Halbleiter eine übermäßige Selenidbildung mit Sicherheit vermieden und infolgedessen ein 'kleinerer Übergangswiderstand erreicht wird, besonders wenn die Metallunterlage aus Leichtmetall, z. B. Aluminium, besteht. Die angegebene Bein-iischung bestimmter Metalle zu dem selenchlorärhaltigen Selen hat also die Wirkung, daß zwei der wesentlichsten Forderungen,- die an ein brauchbares Gleichrichterselen gestellt werden müssen, zugleich erfüllt sind.In addition, the abovementioned metal additives give selenium a further property which is particularly favorable in the manufacture of selenium rectifiers. While in the case of pure selenium, in order to achieve the highest possible conductivity, the conversion from the amorphous to the crystalline form must be carried out at about 20 ° C. Conductivity already at a transformation temperature of 150 ° C and this after a relatively short treatment time. Avoiding the high conversion temperature has a beneficial effect on the selenium rectifier, as now excessive selenide formation at the boundary layer between the metal base and the semiconductor is avoided with certainty and, as a result, a 'lower contact resistance is achieved, especially if the metal base is made of light metal, e.g. B. aluminum. The specified mixture of certain metals with the selenium containing selenium chloride has the effect that two of the most important requirements - which must be made of a usable rectifier selenium - are fulfilled at the same time.
Sehr günstig wirken sich auch gewisse Kombinationen von Selenchlorür mit mehreren der genannten metallischen Elemente aus. Unter Umständen ist es auch günstig, außer dem Metallzusatz noch eine geringe Menge, vorzugsweise 0,3 04 Schwefel beizumischen.Certain combinations of selenium chloride with several of the metallic elements mentioned also have a very favorable effect. Under certain circumstances it is also beneficial to add a small amount, preferably 0.3-0.4 sulfur, in addition to the metal additive.
In der nachstehenden Zahlentafel sind einige solcher Zusätze angeführt,
und es sind die mit ihnen erreichbaren Werte des spezifischen Widerstandes bei einer
Umwandlungstemperatur von i5o' C und einer Umwandlungsdauer von i Stunde
angegeben.
Claims (2)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES137678D DE742935C (en) | 1939-07-01 | 1939-07-01 | Electrical semiconductor made from selenium, especially for dry rectifiers |
DES8687D DE895339C (en) | 1939-07-01 | 1940-06-16 | Electrical semiconductor made from selenium, especially for dry rectifiers |
SE229340A SE100881C1 (en) | 1939-07-01 | 1940-06-20 | |
CH225868D CH225868A (en) | 1939-07-01 | 1940-06-22 | Selenium rectifier. |
BE439047D BE439047A (en) | 1939-07-01 | 1940-08-09 | |
FR872709D FR872709A (en) | 1939-07-01 | 1941-04-16 | Use of selenium as a partial conductor of electricity in dry type current rectifiers |
US389470A US2316905A (en) | 1939-07-01 | 1941-04-19 | Selenium rectifier |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES137678D DE742935C (en) | 1939-07-01 | 1939-07-01 | Electrical semiconductor made from selenium, especially for dry rectifiers |
DES8687D DE895339C (en) | 1939-07-01 | 1940-06-16 | Electrical semiconductor made from selenium, especially for dry rectifiers |
Publications (1)
Publication Number | Publication Date |
---|---|
DE895339C true DE895339C (en) | 1953-11-02 |
Family
ID=25994794
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES137678D Expired DE742935C (en) | 1939-07-01 | 1939-07-01 | Electrical semiconductor made from selenium, especially for dry rectifiers |
DES8687D Expired DE895339C (en) | 1939-07-01 | 1940-06-16 | Electrical semiconductor made from selenium, especially for dry rectifiers |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES137678D Expired DE742935C (en) | 1939-07-01 | 1939-07-01 | Electrical semiconductor made from selenium, especially for dry rectifiers |
Country Status (6)
Country | Link |
---|---|
US (1) | US2316905A (en) |
BE (1) | BE439047A (en) |
CH (1) | CH225868A (en) |
DE (2) | DE742935C (en) |
FR (1) | FR872709A (en) |
SE (1) | SE100881C1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE975018C (en) * | 1952-07-17 | 1961-07-06 | Siemens Ag | Process for the manufacture of selenium rectifiers |
DE1125080B (en) * | 1960-05-02 | 1962-03-08 | Licentia Gmbh | Process for the production of selenium dry rectifiers |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE961365C (en) * | 1941-12-13 | 1957-04-04 | Siemens Ag | Electrical semiconductor made from selenium, especially for dry rectifiers |
DE967323C (en) * | 1943-08-06 | 1957-11-07 | Siemens Ag | Process for the production of selenium rectifiers, the top electrode of which is thallium added in small quantities |
US2447630A (en) * | 1943-11-10 | 1948-08-24 | Westinghouse Electric Corp | Method of making selenium rectifiers |
DE970124C (en) * | 1944-01-17 | 1958-09-04 | Siemens Ag | Process for the manufacture of selenium rectifiers |
US2462949A (en) * | 1944-05-24 | 1949-03-01 | Hartford Nat Bank & Trust Co | Method of treating selenium |
DE924875C (en) * | 1944-06-10 | 1955-03-10 | Siemens Ag | Selenium rectifier with high thermal load capacity |
US2446467A (en) * | 1944-11-11 | 1948-08-03 | Fansteel Metallurgical Corp | Dry plate rectifier |
US2450886A (en) * | 1944-11-20 | 1948-10-12 | Standard Telephones Cables Ltd | Semiconductor |
BE461942A (en) * | 1944-11-20 | |||
DE971697C (en) * | 1948-10-01 | 1959-03-12 | Siemens Ag | Process for the manufacture of selenium rectifiers |
NL153851B (en) * | 1949-05-30 | Lonza Ag | PROCESS FOR THE PREPARATION OF METHACRYLIC ACID FROM ALPHA-HYDROXYISOBUTIC ACID. | |
DE973817C (en) * | 1951-03-05 | 1960-06-15 | Licentia Gmbh | Method of manufacturing a dry rectifier |
NL169311B (en) * | 1951-05-05 | Ici Ltd | PROCESS FOR PREPARING A HYDROXYL GROUP CONTAINING PHENYLSULPHONYL-4-HALOGENEBENZENE SUBSTITUTED AT THE 4' PLACE AND METHOD FOR PREPARING POLYMERS CONTAINING ETHER BONDS CONTAINING 4'-PHENYLSULPHONYL-4-PHENYLENE UNITS. | |
NL178572B (en) * | 1952-06-19 | Vaw Ver Aluminium Werke Ag | METHOD FOR THE FLUID-FREE SOLDERING OF ALUMINUM MATERIALS. | |
DE1060053B (en) * | 1953-02-10 | 1959-06-25 | Siemens Ag | Process for the production of selenium rectifiers with a multilayer semiconductor with different halogen contents and electropositive additives in the individual layers |
DE1156897B (en) * | 1954-03-27 | 1963-11-07 | Siemens Ag | Selenium rectifier in which the selenium layer is made up of at least two sub-layers with different additive content |
NL92960C (en) * | 1955-02-07 | 1900-01-01 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE423105A (en) * | 1936-08-13 | 1900-01-01 |
-
1939
- 1939-07-01 DE DES137678D patent/DE742935C/en not_active Expired
-
1940
- 1940-06-16 DE DES8687D patent/DE895339C/en not_active Expired
- 1940-06-20 SE SE229340A patent/SE100881C1/sv unknown
- 1940-06-22 CH CH225868D patent/CH225868A/en unknown
- 1940-08-09 BE BE439047D patent/BE439047A/xx unknown
-
1941
- 1941-04-16 FR FR872709D patent/FR872709A/en not_active Expired
- 1941-04-19 US US389470A patent/US2316905A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE975018C (en) * | 1952-07-17 | 1961-07-06 | Siemens Ag | Process for the manufacture of selenium rectifiers |
DE1125080B (en) * | 1960-05-02 | 1962-03-08 | Licentia Gmbh | Process for the production of selenium dry rectifiers |
Also Published As
Publication number | Publication date |
---|---|
SE100881C1 (en) | 1941-02-18 |
FR872709A (en) | 1942-06-17 |
CH225868A (en) | 1943-02-28 |
BE439047A (en) | 1940-09-30 |
US2316905A (en) | 1943-04-20 |
DE742935C (en) | 1943-12-15 |
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