GB1239893A - Improvements in or relating to photocathodes - Google Patents

Improvements in or relating to photocathodes

Info

Publication number
GB1239893A
GB1239893A GB1062670A GB1062670A GB1239893A GB 1239893 A GB1239893 A GB 1239893A GB 1062670 A GB1062670 A GB 1062670A GB 1062670 A GB1062670 A GB 1062670A GB 1239893 A GB1239893 A GB 1239893A
Authority
GB
United Kingdom
Prior art keywords
gaas
layer
single crystal
cathode
seed
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
Application number
GB1062670A
Inventor
Peter Richard Selway
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1062670A priority Critical patent/GB1239893A/en
Publication of GB1239893A publication Critical patent/GB1239893A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/34—Photo-emissive cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/34—Photoemissive electrodes
    • H01J2201/342—Cathodes
    • H01J2201/3421—Composition of the emitting surface
    • H01J2201/3423—Semiconductors, e.g. GaAs, NEA emitters

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Abstract

1,239,893. Cathode materials. STANDARD TELEPHONES & CABLES Ltd. 5 March, 1970, No. 10626/70. Heading H1D. A photocathode comprises a single crystal substrate of Al-Ga arsenide containing sufficient Al to provide it with a band width larger than GaAs and a caesiated layer of P-type GaAs of a thickness less than its electron diffusion length. The cathode is prepared by placing a single crystal seed of GaAs in contact with a melt of Ga, As and Al to form a layer of Al 0 . 5 Ga 0 . 5 As. This is lapped and polished and a layer of P- type GaAs vapour deposited. The seed crystal is removed by lapping, a Au ring contact is added and the surface of GaAs cleaned by baking in an ultra high vacuum. A thin layer of Cs is deposited under vacuum then O 2 is admitted to oxidize the surface, this is repeated at least 3 times.
GB1062670A 1970-03-05 1970-03-05 Improvements in or relating to photocathodes Expired GB1239893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1062670A GB1239893A (en) 1970-03-05 1970-03-05 Improvements in or relating to photocathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1062670A GB1239893A (en) 1970-03-05 1970-03-05 Improvements in or relating to photocathodes

Publications (1)

Publication Number Publication Date
GB1239893A true GB1239893A (en) 1971-07-21

Family

ID=9971339

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1062670A Expired GB1239893A (en) 1970-03-05 1970-03-05 Improvements in or relating to photocathodes

Country Status (1)

Country Link
GB (1) GB1239893A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2208187A1 (en) * 1972-11-27 1974-06-21 Rca Corp
FR2217805A1 (en) * 1973-02-13 1974-09-06 Labo Electronique Physique Semiconductor photocathode for near-infrared radiation - comprising transparent gallium-aluminium arsenide layer and electron-emitting gallium-indium arsenide layer
FR2291610A1 (en) * 1974-11-18 1976-06-11 Varian Associates PROCESS FOR MANUFACTURING A COMPONENT CALLED III-V AND PRODUCT OBTAINED
US3980915A (en) * 1974-02-27 1976-09-14 Texas Instruments Incorporated Metal-semiconductor diode infrared detector having semi-transparent electrode

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2208187A1 (en) * 1972-11-27 1974-06-21 Rca Corp
USB309756I5 (en) * 1972-11-27 1975-01-28
US3914136A (en) * 1972-11-27 1975-10-21 Rca Corp Method of making a transmission photocathode device
DE2359072B2 (en) * 1972-11-27 1978-03-30 Rca Corp., New York, N.Y. (V.St.A.) Method of making a see-through photocathode - US Pat
DE2359072C3 (en) * 1972-11-27 1978-11-09 Rca Corp., New York, N.Y. (V.St.A.) Method of making a see-through photocathode - US Pat
FR2217805A1 (en) * 1973-02-13 1974-09-06 Labo Electronique Physique Semiconductor photocathode for near-infrared radiation - comprising transparent gallium-aluminium arsenide layer and electron-emitting gallium-indium arsenide layer
US3980915A (en) * 1974-02-27 1976-09-14 Texas Instruments Incorporated Metal-semiconductor diode infrared detector having semi-transparent electrode
FR2291610A1 (en) * 1974-11-18 1976-06-11 Varian Associates PROCESS FOR MANUFACTURING A COMPONENT CALLED III-V AND PRODUCT OBTAINED

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