Method for preparing polycrystal mercury iodide thin film for radiation detector
A technology of radiation detector and mercury iodide, which is applied in the field of chemical liquid phase deposition, can solve the problems of large differences in structure and performance, and achieve the effect of simple structure and easy operation
Inactive Publication Date: 2012-02-15
SHANGHAI UNIV
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Problems solved by technology
The above physical methods require that the raw material mercury iodide powder has a purity above the analytical purity level (>99.9999%). If the raw material purity is lower than this standard, it is difficult to use these physical methods to prepare polycrystalline mercury iodide, even if it is barely deposited The obtained mercuric iodide materials also have large differences in their structure and performance.
The growth of polycrystalline mercuric iodide materials by purely chemical methods has not been documented to date.
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[0018] Preparation of mercuric iodide thin film: 2,7-dibromo-4-hydroxymercuryl fluorescent red disodium salt (also known as mercury bromide red), iodine tincture reagent according to [Hg 2+ ] and [I ? ], each prepared into a solution with a concentration of 20g / L, and the volume ratio of the two solutions is 1:3; the mixed solution of the two is poured into the experimental device; the rotating magnet in the actual device is Rotate at a speed of 500 rpm per minute to fully react the two reagents; after 0.5h, the free metal Hg + with I - The ions are fully combined to form HgI 2 Molecules, at this time, adjust the speed of the rotating magnet to rotate to 200 rpm per minute, and pour an equal amount of absolute alcohol, the purpose of which is to accelerate the evaporation of the subsequent steps; then vertically insert through acetone, absolute alcohol and deionized After 15 minutes of water ultrasonication, the smooth ITO conductive glass substrate was dried and grown at a...
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Abstract
The invention relates to a process for growing a polycrystal mercury iodide thin film by magnetic stirring excitation vertical deposition technology, which belongs to the technical field of chemical liquid phase deposition technology, wherein the grown polycrystal mercury iodide thin film is used as a transition buffering layer and is particularly suitable for the preparation of X-ray and gama-ray polycrystal mercury iodide thick film detectors. In the method, the polycrystal mercury iodide thin film is prepared by using 2,7-dibromo-4-hydroxy mercury fluoflavin disodium salt (merbromin) and iodine tincture as precursor reaction solution, and uses absolute alcohol as solvents, and the polycrystal mercury iodide thin film is prepared. The prepared thin film is tokened by a metallographic microscope, X ray diffraction (XRD) and an ultraviolet and visible spectrophotometer. Results show that the chemical liquid phase vertical deposition method can be used for preparing the polycrystal mercury iodide thin film grown in the (001) crystal orientation in a cylindrical shape, in addition, the crystal grain structure has good completeness and good uniformity, the film thickness is about 800nm, and the forbidden region width is 2.26 eV. The process has potential practical application prospects.
Description
technical field [0001] The invention relates to a process for growing a polycrystalline mercury iodide thin film using a vertical deposition technique excited by magnetic stirring. The grown polycrystalline mercury iodide thin film is used as an excessive buffer layer, and is especially suitable for X-ray and Gama-ray polycrystalline mercury iodide The invention relates to the preparation of a thick film detector, which belongs to the technical field of chemical liquid phase deposition. Background technique [0002] Mercury iodide crystal is considered as a new type of semiconductor nuclear radiation detector material at home and abroad because of its large band gap, high atomic number, high resistivity, large absorption cross section, and small body current at room temperature. At room temperature, the high-energy radiation detector made by it has high energy resolution for X and Gama rays, and can be used in many fields such as aerospace, environmental monitoring, safety i...
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Inventor 史伟民马磊杨伟光刘功龙陈亮亮刘晟胡喆周杰
Owner SHANGHAI UNIV