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Photoinduced thermoelectron emission source based on low work function composite nanomaterial and its preparation method

A technology of composite nanomaterials and electron emission sources, which is applied in the manufacture of thermionic cathodes, solid thermionic cathodes of discharge tubes, circuits, etc., can solve the problems of restricting photothermal electron emission performance, weak photothermal effect, and difficult photothermal electron emission.

Active Publication Date: 2020-07-07
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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Problems solved by technology

However, the work functions of these materials are relatively high, for example, the work function of carbon nanotubes is about 4.8eV, and that of gold is about 5.3eV, which limits the photothermal electron emission performance of these materials to some extent.
In contrast, some thin films of low work function thermionic emission materials, such as lanthanum hexaboride (LaB6, with a work function of about 2.5eV), have good thermionic emission capabilities, but their photothermal effects are relatively weak and difficult to realize. efficient photothermoelectron emission

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  • Photoinduced thermoelectron emission source based on low work function composite nanomaterial and its preparation method

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[0031] The present invention also provides a method for preparing a device based on a low work function composite nano material-based photothermal electron emission source electron emission source, which includes the following steps:

[0032] Step 1: Using a thermal vapor chemical deposition method to prepare a photothermal conversion material layer 102 on the cathode electrode 101;

[0033] Step 2: Depositing a low work function thermionic emission material film 103 on the surface of the prepared photothermal conversion material layer 102 by using an electron beam evaporation method;

[0034] The light-to-heat conversion material layer 102 adopts an array with optimized light absorption efficiency, and the distance between adjacent emitting units is 10 micrometers; in a preferred embodiment of the present invention, the light-to-heat conversion material layer 102 uses carbon nano A tube array. The carbon nanotube array is a cylindrical array with a height of 100 micrometers, a cylin...

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Abstract

The invention provides a photothermal electron emission source device based on a composite nanomaterial of combining a low work function thermal electron emission material film and a photothermal material capable of improving the electron emission efficiency of a photothermal electron emission source and a preparation method of the photothermal electron emission source device. The photothermal electron emission source comprises a cathode electrode, photoelectric conversion material layers prepared on the cathode electrode and low work function thermal electron emission material films covering the surfaces of the photoelectric conversion materials. The low work function thermal electron emission material films are combined with the photoelectric conversion materials, the excellent thermal electron emission performance of the low work function thermal electron emission material films is utilized and the excellent photothermal conversion efficiency of the materials, such as a carbon nanotube and noble metal nano-particles is also utilized, so that advantage complementation of the two materials is achieved through an indirect heating mode, and the technical disadvantages, such as high incident light power and low brightness required by an existing photothermal electron source are overcome.

Description

Technical field [0001] The invention relates to a photothermal emission cathode and a preparation method thereof, in particular to a photothermal electron emission cathode based on a low work function composite nano material, which is suitable for cathode electron sources in various vacuum electronic devices or vacuum solar devices . Background technique [0002] There are many forms of vacuum electron emission, such as thermionic emission, field electron emission, and photoelectron emission. In the photoelectron emission, there is a photothermal electron emission mechanism, which mainly uses materials to absorb light energy to generate high temperature, and then realize thermionic emission. Compared with the traditional thermionic source, this electron emission mechanism has the advantages of large emission current density, controllable emission area, fast response speed, and high sensitivity. Compared with the field-induced electron emission, which has been studied more at pre...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/13H01J1/148H01J9/04
CPCH01J1/13H01J1/148H01J9/04
Inventor 戴庆李驰白冰李振军陈科
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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