The effect of annealing on the X-ray induced photocurrent characteristics of CVD diamond radiation detectors with different electrical contacts

被引：14

作者：

Abdel-Rahman, Mohamed A. E. ^{[1
]}

Lohstroh, Annika ^{[1
]}

Sellin, Paul J. ^{[1
]}

机构：

[1] Univ Surrey, Dept Phys, Surrey GU2 7XH, England

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2011年 / 208卷 / 09期

关键词：

CVD diamond; dosimetric characteristics; electrical contact; radiation detector; SINGLE-CRYSTAL DIAMOND; DOSIMETRY; PHOTON; IMPROVEMENTS; DEFECTS; DEVICES;

D O I：

10.1002/pssa.201100011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An investigation on the influence of metal-diamond interfaces on the X-ray induced photocurrent characteristics of diamond based solid state radiation detectors has been performed before and after annealing in order to identify the parameters of metal contact formation which maximise the performance. For this purpose, two different samples with different metal contacts were fabricated by sputtering Pt (labelled HPS-Pt) and Al/Pt (labelled UPS-Al/Pt) on to high quality CVD diamond. To examine the performance of the two samples, a set of measurements was performed before and after annealing the devices: I-Vcharacteristics, time response such as rise and fall-off times, sensitivity and specific sensitivity, signal to noise ratio (SNR), photoconductive gain, dose rate dependence and reproducibility were studied. The effect of the changes in bias voltage on the performance of the samples was also investigated. The response of annealing the devices is strongly dependent on the metal contact. UPS-Al/Pt showed a strong increase in the current amplitude (similar to 240 times the value before annealing) and the stability is improved as a high overshoot is totally removed after annealing. Annealing UPS-Pt showed a slight increase in the current amplitude and the small overshoot existing at low dose rate is also removed, however the stability of the currents is reduced which affected the reproducibility of the signal. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2079 / 2086

页数：8

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