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Middle concentration P-type doping transmission type gallium arsenide optical cathode material and method for preparing same

A gallium arsenide light and cathode material technology, applied in the direction of photoemission cathode, discharge tube main electrode, semiconductor/solid-state device manufacturing, etc., can solve the problems of low photoelectric sensitivity of photocathode and low activation efficiency of photocathode, and achieve defects Fewer dislocations, improved photoelectric sensitivity, and improved escape probability

Inactive Publication Date: 2008-10-15
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

The activation efficiency of silver-cesium-oxygen (Ag-Cs-O) photocathode is low, and the photoelectric sensitivity of the photocathode is low

Method used

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  • Middle concentration P-type doping transmission type gallium arsenide optical cathode material and method for preparing same
  • Middle concentration P-type doping transmission type gallium arsenide optical cathode material and method for preparing same
  • Middle concentration P-type doping transmission type gallium arsenide optical cathode material and method for preparing same

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Embodiment Construction

[0023] Combined with Figure 1 below, figure 2 , image 3 Describe in detail the structural details and working conditions of the concentration P-type doped transmissive gallium arsenide (GaAs) photocathode material in the specific implementation of the present invention.

[0024]The transmissive photocathode was fabricated using an inversion process. Since the thickness of the P-type gallium arsenide active region is very thin (about 2 μm), there must be a support body. First, an AlGaAs-GaAs double heterojunction structure was grown on a GaAs substrate by molecular beam epitaxy (MBE) (see Figure 1(a) for a schematic diagram of the growth structure). Then the structure is inverted and heat-sealed on the optical window material, which acts as a support for the active region (see Figure 1(b) for the inversion process). After being inverted and heat-sealed, a series of chemical treatments are carried out to etch away the gallium arsenide substrate all the way to the reaction ba...

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Abstract

This invention relates to semi-conductor material technique used in transparent negative electron affinity gallium arsenide light negative electrode device. This invention source area has two layers of inner layer and surface layer, wherein the inner layer has a window layer outside ad the outside of the surface layer is Se or oxygen actuating layer. The source inner layer is mixed with 1-8x10#+[18]cm#+[-3] in middle concentration and the surface layer is mixed with 5x10#+[16]-1x10#+[17]cm#+[-3] in low concentration.

Description

technical field [0001] The invention relates to semiconductor material technology, in particular to a medium-concentration P-type doped transmissive gallium arsenide (GaAs) photocathode material and its preparation technology for transmissive negative electron affinity (NEA) gallium arsenide (GaAs) ) photocathode device. It works on the external photoelectric effect. The photocathode material converts the weak infrared and near-infrared light in the environment into photoelectrons and emits them, which are imaged on the fluorescent screen, so as to achieve the purpose of instant observation. Background technique [0002] At present, the level of my country's development of transmissive negative electron affinity GaAs photocathode devices is: the photoelectric sensitivity can reach 1200μA / lm. There is a big gap between this data and the 3200μA / lm reported internationally. According to the latest report, the minority carrier diffusion length of foreign photocathode material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/34H01L33/00H01L21/02
Inventor 王晓峰曾一平
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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