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High-quantum-efficiency low-thermal-emission double-alkali photocathode used for photomultiplier and preparation method thereof

A technology of photomultiplier tube and photocathode, which is applied in the direction of photoemission cathode, electron multiplier cathode device, dynode, etc., can solve problems not involved in quantum efficiency evaluation and analysis, and achieve excellent consistency, high quantum efficiency, low noise effect

Active Publication Date: 2020-07-10
NORTH NIGHT VISION TECH
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AI Technical Summary

Problems solved by technology

As an early public technical solution, its process regulation on the preparation process is aimed at improving the quantum efficiency of the photocathode, but it does not involve the evaluation and analysis of the impact of the improvement of quantum efficiency on the noise of the whole tube

Method used

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  • High-quantum-efficiency low-thermal-emission double-alkali photocathode used for photomultiplier and preparation method thereof
  • High-quantum-efficiency low-thermal-emission double-alkali photocathode used for photomultiplier and preparation method thereof
  • High-quantum-efficiency low-thermal-emission double-alkali photocathode used for photomultiplier and preparation method thereof

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] The prepared K 2 In the process control process of CsSb photocathode, the K-Sb layer is first formed. Since the ratio of K to Sb in the standard K-Sb layer is 3:1, but in the variable doping structure, the amount of Sb in the early stage is required to be slightly larger. Therefore, the evaporation ratio is K:Sb=2.82:1; the amount of Sb is gradually reduced while the amount of K is gradually increased by continuing to evaporate. The repeated process of each evaporation cycle forms a K-Sb layer with a different ratio, from the body to the surface followed by K 2.88 Sb 1.0 、K 2.94 Sb 1.0 、K 3.0 Sb 1.0 、K 3.06 Sb 1.0 and K 3.12 Sb 1.0 . During the Cs evaporation process, each Cs atom replaces one K atom, finally forming an alkali metal antimonide structure with a K / Cs ratio of 2:1.

[0032] In the specific process of the above preparation, the control m...

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Abstract

The invention belongs to the technical field of photomultipliers. The invention discloses a high-quantum-efficiency low-thermal-emission double-alkali photocathode used for a photomultiplier and a preparation method thereof. The obtained double-alkali photocathode structure is formed by stacking a plurality of layers of alkali antimonide on a substrate in sequence, the composition of the alkali antimonide in the direction from the substrate to the outer surface of the double-alkali photocathode is in a rule that the antimony element is gradually reduced and the alkali metal element is gradually increased, and the quantum efficiency of the micro-channel plate type photomultiplier is improved; in the preparation process, the light current inflection point is controlled by adjusting the rateof increasing the current of an antimony ball in the first stage of simultaneous evaporation of potassium and antimony; by comprehensively regulating and controlling the change of antimony-off observation reflectivity in the second stage of simultaneous evaporation of potassium and antimony, the hot electron emission of the photocathode is reduced, so that the integral sensitivity of the double-alkali cathode is reduced, the noise of the micro-channel plate type photomultiplier is improved, and the process consistency is relatively good.

Description

technical field [0001] The invention relates to the technical field of photomultiplier tubes, in particular to a double-alkali photocathode used in a photomultiplier tube with high quantum efficiency and low thermal emission and a preparation method thereof. Background technique [0002] A photomultiplier tube (PMT) is a vacuum electronic device that converts weak light signals into electrical signals and multiplies and amplifies the electrical signals. The photocathode is one of the core components of the photomultiplier tube. It is used to capture the incident photons and excite photoelectrons. Its performance directly affects the performance of the entire photomultiplier tube. Its main performance parameter is quantum efficiency (quantum efficiency refers to photoelectric The number of photoelectrons that the cathode can emit per 100 photons received by the cathode), the higher the quantum efficiency, the higher the detection efficiency of the photomultiplier tube. In ad...

Claims

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Application Information

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IPC IPC(8): H01J9/12H01J1/34H01J43/08C23C14/24C23C14/18
CPCH01J9/12H01J1/34H01J43/08C23C14/24C23C14/18
Inventor 金睦淳任玲孙建宁司曙光王兴超侯巍王亮王从杰纪路路顾莹
Owner NORTH NIGHT VISION TECH
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