Preparation method of microstructure reinforcement reflective photocathode

Abstract

The invention relates to a preparation method of a microstructure reinforcement reflective photocathode. According to the method, an acid solution and an alkali solution are adopted to carry out treatment on a micro-channel plate alternatively so as to acquire a microstructure reinforcement substrate with the surface being provided with an inverted conical backward concave type microstructure array, an electrode layer and a photoelectric emission layer are sequentially plated at the surface of the microstructure reinforcement substrate by adopting a physical vapor deposition method, and a microstructure reinforcement reflective photocathode is prepared. According to the microstructure reinforcement reflective photocathode acquired through the method, the quantum efficiency and the detection ability for weak signals of the photocathode can be greatly improved, and the photoelectric emission uniformity and the stability are good, thereby being applicable to a large-scale photoelectric emission surface in spatial discrimination. The method provided by the invention further has the advantages of simple technological process, low cost and the like.

Description

technical field [0001] The invention relates to photoelectric technology, in particular to a method for preparing a microstructure-enhanced reflective photocathode. Background technique [0002] A photocathode is a photoelectric conversion device consisting of a negatively charged substrate electrode and a layered photoemissive material deposited on it. When light is injected into the photoemissive material, photon energy excites photoelectrons and emits from the surface of the material. Under the action of the electric field of the electrode, the photoelectrons carrying incident light information are collected by the anode and converted into electrical signals. Photocathode is the core component of equipment such as image-changing tubes, camera tubes, and radiation detectors. It has important applications in high-energy-density physics research, weak signal detection, and low-light imaging. [0003] Existing photocathodes are divided into planar photocathodes and structura...

AI Technical Summary

Problems solved by technology

However, the existing known structure-enhanced photocathode technology is difficult to precisely control the microstructure morphology, the uniformity and stability of photoelectric emission are difficult to guarantee, and the process is complicated and the cost is high.

The article "High quantum efficiency photocathodesimulation for the investigation of novel structured designs" published in "Review of Scientific Instruments" in 2014 proposed a theoretical design of an inverted conical concave microstructure photocathode. The results of software simulation show that the photocathode with this structure can greatly improve the detection efficiency, but the article only This photocathode has been analyzed theoretically, but its actual preparation methods and technologies have not yet been realized.

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