DocumentCode :
884693
Title :
Study of the thickness of the dead Layer below electrodes, deposited by electroless technique, in CdTe nuclear detectors
Author :
Zahraman, Khaled ; Roumie, Mohamad ; Raulo, Adelaide ; Auricchio, Natalia ; Ayoub, Mohamed ; Donati, Ariano ; Dusi, Waldes ; Hage-Ali, Makram ; Lmaï, Fatima ; Perillo, Eugenio ; Siffert, Paul ; Sowinska, Malgorzata ; Ventura, Giulio
Author_Institution :
CNRSL, Nat. Council for Sci. Res., Beirut
Volume :
53
Issue :
1
fYear :
2006
Firstpage :
378
Lastpage :
382
Abstract :
The semiconductor nuclear detector structure is usually a superposition of several different layers: the metallic electrode, the interface, the depleted zone, the nondepleted one, and finally the second electrode. All inactive layers, and particularly the "dead layer" region below the metallic electrodes, give rise to absorption for photons (X, gamma) and to energy loss for charged particles. As a consequence, the detectors measure lower count rates for photons, particularly at low energies, and lower energies for charged particles. The amount of this effect can be only partially attributed to the inactive metallic electrode; the main part has to be attributed to the highly defected zone below the electrode in the interfacial region. This is a structural drawback which needs to be studied to reduce this effect, e.g., by developing new polishing and deposition techniques, or to perform the appropriate corrections. We have measured the thickness of this dead layer for various solution dilution electroless depositions of Pt electrodes on CdTe devices. These measurements were carried out by using collimated (X, gamma) rays beams impinging at different angles, especially the grazing ones, and comparing the count rates registered at two selected angles, and by measuring Rutherford backscattering spectra and energy loss of 4He ions
Keywords :
semiconductor counters; 4He ions energy loss; CdTe nuclear detectors; Pt electrodes; Rutherford backscattering spectra; charged particles energy loss; collimated X-ray beams; collimated gamma-ray beams; dead layer; depleted zone; metallic electrode; nondepleted zone; photon absorption; semiconductor nuclear detector structure; solution dilution electroless depositions; Collimators; Current measurement; Detectors; Electrodes; Electromagnetic wave absorption; Energy loss; Energy measurement; Loss measurement; Particle measurements; Thickness measurement; CdTe detectors; Rutherford backscattering spectrometry (RBS) measurements; X-ray measurements; dead layer; energy loss; various irradiation angles;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2006.869846
Filename :
1611007
Link To Document :
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