GB1200899A - Improvements in or relating to photocathodes - Google Patents

Improvements in or relating to photocathodes

Info

Publication number
GB1200899A
GB1200899A GB18486/67A GB1848667A GB1200899A GB 1200899 A GB1200899 A GB 1200899A GB 18486/67 A GB18486/67 A GB 18486/67A GB 1848667 A GB1848667 A GB 1848667A GB 1200899 A GB1200899 A GB 1200899A
Authority
GB
United Kingdom
Prior art keywords
caesium
oxygen
photo
layer
photoemission
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
GB18486/67A
Inventor
Andrew Alfred Turnbull
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB18486/67A priority Critical patent/GB1200899A/en
Priority to NL6805301A priority patent/NL6805301A/xx
Priority to DE19681764170 priority patent/DE1764170C3/en
Priority to SE05201/68A priority patent/SE333415B/xx
Priority to CH579668A priority patent/CH474147A/en
Priority to BE713951D priority patent/BE713951A/xx
Priority to FR1569963D priority patent/FR1569963A/fr
Priority to US722864A priority patent/US3632442A/en
Publication of GB1200899A publication Critical patent/GB1200899A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S148/00—Metal treatment
    • Y10S148/065—Gp III-V generic compounds-processing

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Liquid Deposition Of Substances Of Which Semiconductor Devices Are Composed (AREA)
  • Hybrid Cells (AREA)

Abstract

1,200,899. Cathode materials and processing. MULLARD Ltd. 30 Aug., 1967 [21 April, 1967], No. 18486/67. Heading H1D. In a method of manufacturing a photocathode, a surface of a body of P-type semiconductive material, comprising an equiatomic compound of an element of the third column with an element of the fifth column of the periodic table or a mixed crystal thereof, is heated and afterwards exposed to caesium vapour and oxygen at room temperature to form a layer of a caesium-oxygen system a number of molecules thick, wherein the workfunction of this layer is equal to or less than the band gap energy, measured as the energy separation between the bottom of the conduction band and the Fermi level where the bands are straight, in the bulk semi-conductive material. Gallium arsenide doped with zinc at 4 Î 10<SP>-19</SP> atoms per c.c. may be baked at 300‹ C. in caesium vapour for a few minutes and after cooling to room temperature is exposed alternately to caesium and oxygen until the layer, e.g. 50 Š thick, has been built up. The exposure to caesium each time is carried out until photoemission from the surface rises to a maximum and then drops to 10 to 50% of this value, the succeeding oxygen exposure, preferably using spectroscopically pure oxygen at 5 Î 10<SP>-6</SP> Torr, is continued until photoemission is maximized again. The semiconductor materials used and surface preparation may be as described in Specification 1,086,228. The photo-cathode may be employed in a photo-cell, a photo-multiplier or an Iconoscope, Figs. 2-4 (not shown).
GB18486/67A 1967-04-21 1967-04-21 Improvements in or relating to photocathodes Expired GB1200899A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB18486/67A GB1200899A (en) 1967-04-21 1967-04-21 Improvements in or relating to photocathodes
NL6805301A NL6805301A (en) 1967-04-21 1968-04-13
DE19681764170 DE1764170C3 (en) 1967-04-21 1968-04-17 Method of manufacturing a photocathode for an electric discharge tube
SE05201/68A SE333415B (en) 1967-04-21 1968-04-18
CH579668A CH474147A (en) 1967-04-21 1968-04-19 Method for producing an electrical discharge tube with a photocathode and electrical discharge tube produced according to the method
BE713951D BE713951A (en) 1967-04-21 1968-04-19
FR1569963D FR1569963A (en) 1967-04-21 1968-04-19
US722864A US3632442A (en) 1967-04-21 1968-04-22 Photocathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18486/67A GB1200899A (en) 1967-04-21 1967-04-21 Improvements in or relating to photocathodes

Publications (1)

Publication Number Publication Date
GB1200899A true GB1200899A (en) 1970-08-05

Family

ID=10113256

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18486/67A Expired GB1200899A (en) 1967-04-21 1967-04-21 Improvements in or relating to photocathodes

Country Status (7)

Country Link
US (1) US3632442A (en)
BE (1) BE713951A (en)
CH (1) CH474147A (en)
FR (1) FR1569963A (en)
GB (1) GB1200899A (en)
NL (1) NL6805301A (en)
SE (1) SE333415B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL160425C (en) * 1971-08-17 1979-10-15 Philips Nv METHOD OF MANUFACTURING AN ELECTRICAL DISCHARGE TUBE, INCLUDING AN ELECTRON-EMITTING ELECTRODE, CONSISTING OF A SUPPORT, ONTO WHICH A CAESIUM-CONTAINING LAYER HAS BEEN APPLIED, AND ELECTRICAL DISCHARGE TUBE.
US3958143A (en) * 1973-01-15 1976-05-18 Varian Associates Long-wavelength photoemission cathode
GB1528192A (en) * 1975-03-10 1978-10-11 Secr Defence Surface treatment of iii-v compound crystals
US4242373A (en) * 1976-02-20 1980-12-30 Hitachi, Ltd. Method for vapor depositing a cerium oxide film
US4816183A (en) * 1986-08-21 1989-03-28 The Board Of Trustees Of The Leland Stanford Junior University Composite photosensitive material
JPS63291337A (en) * 1987-05-22 1988-11-29 Sharp Corp Photo-cathode
US6019913A (en) * 1998-05-18 2000-02-01 The Regents Of The University Of California Low work function, stable compound clusters and generation process
US7015467B2 (en) * 2002-10-10 2006-03-21 Applied Materials, Inc. Generating electrons with an activated photocathode
US7446474B2 (en) * 2002-10-10 2008-11-04 Applied Materials, Inc. Hetero-junction electron emitter with Group III nitride and activated alkali halide
US8017176B2 (en) * 2008-01-25 2011-09-13 Mulhollan Gregory A Robust activation method for negative electron affinity photocathodes

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2070691A (en) * 1928-07-02 1937-02-16 Raytheon Mfg Co Electron discharge device
US1994904A (en) * 1933-04-22 1935-03-19 Westinghouse Electric & Mfg Co Automatic heat control
NL50859C (en) * 1937-03-30 1941-08-16
NL50264C (en) * 1937-04-02
US2698397A (en) * 1948-07-01 1954-12-28 Sylvania Electric Prod Electron discharge device
US2880344A (en) * 1951-03-02 1959-03-31 Rca Corp Photosurface
US2739084A (en) * 1951-04-28 1956-03-20 Emi Ltd Secondary electron emitting coatings and method for producing same
US2702259A (en) * 1951-08-09 1955-02-15 Emi Ltd Manufacture of electrodes which are sensitized so as to be emitters of photoelectrons or secondary electrons
NL147572B (en) * 1964-12-02 1975-10-15 Philips Nv ELECTRIC DISCHARGE TUBE WITH A PHOTO CATHOD.

Also Published As

Publication number Publication date
DE1764170B2 (en) 1975-10-23
NL6805301A (en) 1968-10-22
CH474147A (en) 1969-06-15
DE1764170A1 (en) 1971-05-27
US3632442A (en) 1972-01-04
BE713951A (en) 1968-10-21
SE333415B (en) 1971-03-15
FR1569963A (en) 1969-06-06

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees