Effect of CdTe crystal thickness on the efficiency of Cr/CdTe/Au Schottky-diode detectors

被引：11
作者：
Sklyarchuk, V. M. [1 ]
Gnatyuk, V. A. [2 ,3 ]
Aoki, T. [3 ]
机构：
[1] Yuriy Fedkovych Chernivtsi Natl Univ, Kotsyubynskyi Str 2, UA-58012 Chernovtsy, Ukraine
[2] Natl Acad Sci Ukraine, VE Lashkaryov Inst Semicond Phys, Prospekt Nauky41, UA-03028 Kiev, Ukraine
[3] Shizuoka Univ, Res Inst Elect, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328011, Japan
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2020年 / 953卷
关键词：
CdTe crystal; Schottky diode; X/gamma-ray detector; Uncompensated impurity concentration; Detection efficiency; Energy resolution; HARD X-RAY; CADMIUM TELLURIDE; DEFECT FORMATION; LASER;
D O I：
10.1016/j.nima.2019.163224
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The effect of CdTe crystal thickness on the detection efficiency and energy resolution of Cr/CdTe/Au diode X/gamma-ray detectors has been studied. The Schottky (Cr electrode) and near Ohmic (Au electrode) contacts were created using Ar plasma treatment of the B- and A-faces of CdTe(111) single crystals at different regimes, respectively. Detector-grade CdTe wafers with an area of 5 x 5 mm(2) and thicknesses d of 0.5 mm, 0.75 mm, 1.0 mm and 2.0 mm were used. High energy resolution (FWHM) in the Cs-137 spectra (662 keV peak) was achieved: from 0.5 % for thin detectors to 3.0 % for thick ones. From the comparison of the detection efficiency dependences on the CdTe crystal thickness with the corresponding calculated dependences, the uncompensated impurity concentration in CdTe was obtained as N approximate to 4 x 10(10) cm(-3). N determines the space-charge region width W in Schottky diodes, therefore the effect of this value on the detection efficiency was analyzed. A key feature of the efficiency calculation was the correct evaluation of the electric field strength in the crystals and also using the integration limit d rather than W when W > d (in contrast to the earlier works).
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页数：5
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