J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 The free carrier transport properties in proton and neutron irradiated Si(Ge) (and comparison with Si)

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J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 The free carrier transport properties in proton and neutron irradiated Si(Ge) (and comparison with Si) J.Vaitkus, V.Rumbauskas, L.Makarenko 1, A.Mekys, J.Storasta Vilnius University, Institute of Applied Research, Vilnius, Lithuania 1 Belorussian university, Minsk, Belorussia

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 The important questions: 1) Are the changes in the semiconductor homogeneity caused by the irradiation? 2) What kind of inhomogeneities are induced by crystal growth (different doping) and treatments? The answers can be find by investigation of the transport properties of free carriers.

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Basic principle Hall and magnetoresistance effects are “simple classical effects” demonstrating the transport properties of free carrier. V - +A f =1 in a thin sample

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Scattering by large defects: Complications of the Basic principle in the nonhonogeneous sample V - +A

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Inhomogeneities V. G. Karpov, A. J. Shik and B. I. Schklovskij (1982): The cells of typical clusters: I, II and III. Dashed lines indicates the equipotential lines W. Siegel, S. Schulte, C. Reichel, G. Kuhnel, J. Monecke. „Anomalous temperature dependence of the Hall mobility in undoped bulk GaAs“. J. Appl. Phys., Vol. 82, No. 8, pp (1997) Also, a bit different analyse:

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Single crystals Si (WODEAN1 series) The weak dependence on T was observed in low irradiated samples The Hall and magnetoresistance mobility behavior was different. Anomalous Hall mobility dependence on T was observed Irradiation by neutrons

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 A new series: Minsk-KEF Magnetoresistivity mobility values are typical for good n-type Si. At higher doses of irradiation the Hall signal lowers at low T similarly to the case of clusters. Large scale electric potential disturbance occurs. Irradiation by electrons (6MeV) to create only the point defects

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 KDB conductivity (irradiated 4 MeV electrons) The conductivity in the initial samples decreases with T. This is the case when the carrier density changes less than the mobility. At the higher irradiation doses the conductivity decreases. The greater sample volume is damaged.

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 KDB density Thermal activation from the density show some clear values.

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 KEF conductivity Similar situation as in KDB samples. But the conductivity decreases less for the greater doses while it decreases more for lower doses.

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 KEF density Thermal activation from the density show some clear values.

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Si(Ge) Cz SiGe crystals were grown in Leibniz Institute for Crystal Growth, Berlin, Germany by N.V. Abrosimov Due to deformation of the lattice the increase of radiation hardness is waited. It exists experience to destroy the dislocation net in GaAs by adding isovalent impurity In. What is happening in transport properties? The start of the analyze cycle.

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Hall mobility in Si(Ge) (neutron irradiation) Adding of Ge enhances the hole mobility. Irradiation 1e12 cm -2 increases the Hall mobility but the 1e13 cm -2 decreases the Hall mobility in both n-type and p-type (at C)

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Proton irradiated Si(Ge)

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Proton irradiated Si(Ge)

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Si(Ge) Neutron irradiation Proton irradiation

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Neutrons, Si(Ge) HallMagnetoresistance

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Conclusions: The main peculiarities of transport phenomena are induced by cluster defects. Hall effect and magnetoresistance measurement allow to reveal these inhomogeneities The initial studies of low irradiated Si(Ge) were performed. The irradiation to the higher fluence is the next step.

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 THANK YOU FOR YOUR ATTENTION

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Hall factor Hall scattering factor r H is defined by following expressions: The relaxation time for individual scattering process often follows a power law: Mechanism srHrH r MP r MG Ionized impurities -3/ Neutral impurities 0101 Acoustic phonons+1/ Etc. Variation of Hall scattering factor with total impurity density N imp. In n-type Si. Experimantal points: -x- 77K, -o- 300K. Solid curves: calculated (from Kirnas et al., 1974)

J.Vaitkus, L.Makarenko et all. RD50, CERN, 2012 Inhomogeneities R. H. Bube model : l2l2 VHVH grain l1l1 l1l1 VAVA [R. H. Bube, Appl. Phys. Lett. 13, 136 (1968)]