Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Photocathode and its preparation method

A technology of photocathode and metal nanoparticles, which is applied in the manufacture of light-emitting cathodes, photoemission cathodes, and main electrodes of discharge tubes. The effect of strong absorption capacity

Active Publication Date: 2020-01-07
INST OF ELECTRONICS CHINESE ACAD OF SCI
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this kind of cathode is prone to the problem of alkali metal evaporation, especially under the action of strong light, the evaporation rate of alkali metal is faster, which affects the quantum efficiency of the photocathode

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Photocathode and its preparation method
  • Photocathode and its preparation method
  • Photocathode and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The preparation materials of the alkali metal source 5 include: cesium, sodium or potassium.

[0039] The heating body 6 is used for heating, and the material includes: tungsten, molybdenum or tungsten-rhenium and the like.

[0040] In an embodiment of the present disclosure, a method for preparing a photocathode is also provided, image 3 It is a schematic flow chart of the preparation method of the photocathode in the embodiment of the present disclosure, combined with figure 2 and image 3 Shown, described preparation method comprises:

[0041] Step 1: Deposit a layer of metal nanoparticle film 2 on the surface of the photocathode substrate 1;

[0042] The thickness of the metal particle film is 200nm-500nm, and the diameter of the metal nano-particle is about 10nm-100nm;

[0043] Step 2: using the heating body 6 to heat the photocathode substrate 1 deposited with the metal nanoparticle thin film 2, so that it is fully degassed at a temperature above 800°C;

[...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a photoelectric cathode, which comprises a photoelectric cathode substrate; a metal nanoparticle film, wherein the metal nanoparticle film is deposited on the photocathode substrate; an antimony alkali metal compound, wherein the antimony alkali compound is prepared on the metal nanoparticle film; the invention also provides a preparation method of the photoelectric cathode,which comprises the following steps: 1, depositing a layer of metal nanoparticle film on the surface of the photoelectric cathode substrate; 2, heating the photoelectric cathode substrate deposited with the metal nanoparticle film by using a heating body so as to sufficiently remove gas at the temperature of above 800 DEG C; 3, heating, through the heating body, to evaporate the antimony in the antimony source to form an antimony film on the surface of the prepared metal nanoparticle film; and 4. heating, through the heating body, the alkali metal source and a reducing agent, as well as the photoelectric cathode substrate, ejecting the generated alkali metal vapor to the photoelectric cathode substrate and reacting with the antimony film generated in step 3 to prepare a photoelectric cathode, the problem of alkali metal evaporation of the antimony alkali metal compound photoelectric cathode under the action of strong light is relieved, and the quantum efficiency of the photoelectric cathode is improved.

Description

technical field [0001] The disclosure belongs to the technical field of photocathode, and in particular relates to a photocathode and a preparation method thereof. Background technique [0002] In 1887, when Hertz observed that irradiating the cathode with ultraviolet light could cause a spark discharge between two electrodes with a large distance, he discovered the photoelectric effect, which was solved by Einstein's quantum theory in 1905. After 1929, the silver oxycesium photocathode was discovered, which had a quantum efficiency two orders of magnitude higher than that of previously used materials and was sensitive to the entire visible spectrum, including the near infrared. With the advent of the silver cesium oxycathode, photocathode research focuses on exploring other complex materials with higher quantum efficiency and different spectral response characteristics. The first important application of the photocathode was to reproduce sound from film, followed by variou...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/34H01J9/12
CPCH01J1/34H01J9/12
Inventor 刘燕文田宏李芬石文奇朱虹谷兵
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com