Photoconductive detector

Abstract

The invention relates to a photoconductive detector, which comprises a semiconductor, and a cathode and an anode located at two sides of the semiconductor, wherein the cathode is a plate-type cathode, and the anode is provided with multiple uniformly-distributed through hole. The axial direction of the through holes is along the longitudinal direction of an electric field, the electric field inside the detector thus tends to homogenization, and a weight field near the anode is enhanced. The quantum efficiency of the detector is not reduced significantly while the energy resolution of the detector is improved.

Description

technical field [0001] The invention relates to a detector, in particular to a photoconductive detector. Background technique [0002] Semiconductor nuclear radiation detectors usually use metal-semiconductor-metal (MSM) photoconductive detectors, that is, two flat-plate contact electrodes are made at both ends of a high-resistance semiconductor, thus forming a so-called flat-panel detector. The main advantages of this detector are simple electrode structure, large acceptance angle and capture volume for photons or particles, and high capture efficiency. However, its disadvantage is that due to the difference in electron and hole transport properties, the electron drift speed is fast and the life is long, while the hole drift speed is slow and the life is short, so the collection depth of the electron charge is much higher than the collection depth of the hole charge, thus The hole collection efficiency near the anode is greatly reduced, so that the charge collection effici...

AI Technical Summary

Problems solved by technology

[0005] Although the above two electrode structures that enhance single-carrier collection performance can improve the energy resolution of the detector, the overall quantum efficiency of the detector will be reduced due to the weakening of the current signal in a considerable area near the cathode.

And due to the addition of new electrodes, the electrode structure becomes more complex

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