Preparation method of 6LiF conversion film used for 4H-SiC-based semiconductor neutron detector
A neutron detector and semiconductor technology, which is applied in the field of preparation of 6LiF conversion thin films for 4H-SiC-based neutron detectors, can solve the problems of complex deposition process, difficult control of film thickness, and inability to meet high-efficiency neutron detectors.
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Embodiment 1
[0028] The 4H-SiC based neutron detector of the present embodiment is used 6 LiF conversion film preparation process is as follows:
[0029] a. Put the substrate material 4H-SiC matrix into acetone and absolute ethanol in sequence for 20 minutes of ultrasonic cleaning, take out and dry after fully cleaning;
[0030] b. Use the single crystal 4H-SiC substrate after cleaning in step a as the magnetron target 6 Li concentration of 95% 6 The LiF target is placed in the vacuum chamber of the reactive magnetron sputtering coating vacuum furnace, and then evacuated to 5.0×10 -4 Pa, the impurities in the single crystal 4H-SiC substrate are removed by bias reverse sputtering cleaning, the power of reverse sputtering cleaning is 100W, and the bias voltage is -500V; pre-sputtering cleaning is used to remove impurities 6 The impurity of LiF target material, the power of pre-sputter cleaning is 100W, and the bias voltage is -100V; the starting gas of reverse sputter cleaning and pre-spu...
Embodiment 2
[0035] The 4H-SiC based neutron detector of the present embodiment is used 6 The LiF conversion film preparation process is basically the same as in Example 1, the difference is that the magnetron 6 LiF target 6 The concentration of Li is 85%, and the reactive magnetron sputtering coating vacuum furnace is evacuated to 4.0×10 -4 Pa, the power of reverse sputter cleaning is 80W, the bias voltage is -400V; the power of pre-sputter cleaning is 80W, the bias voltage is -100V, the flow rate of argon gas is 150Sccm, the operation vacuum of reverse sputter cleaning and pre-sputter cleaning The pressure is 1.0Pa absolute pressure. The power of sputtering deposition is 100W, the flow rate of argon gas is 120Sccm, and the vacuum absolute pressure of sputtering deposition operation is 0.40Pa; 6 The operation process of sputtering deposition of LiF coating is a continuous operation process. sputter deposition 6 The thickness of the LiF coating is 1 μm, and the vacuum degree in the re...
Embodiment 3
[0037] in deposition 6 During the LiF conversion film process, the deposition power has a great influence on the thickness, uniformity and structure of the conversion film. This embodiment 6 Coating equipment and other process conditions used for the preparation of LiF conversion film are all the same as in Example 1, and keep 6 LiF conversion film thickness 5μm controllable, deposition 6 Change the deposition power when converting LiF film, if selected as 80W, 100W and 150W, it can 6 The deposition rate control of the LiF conversion film can also meet the requirements of precise and controllable thickness, and the prepared conversion film layer can also be passed 6 Li(n,α) 3 The α and T particle energy spectra generated by the H reaction test the intensity information of the incident neutrons.
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