Additional  Phonon Modes related to intrinsic defects in CdHgTe

Jacek Polit 1E Sheregii 1A Kisiel 2B V. Robouch 3M Cestelli Guidi 4J Cebulski 1Andrzej Mycielski 5M Piccinini 3

1. University of Rzeszow, Institute of Physics, Rejtana 16, Rzeszów 35-310, Poland
2. Jagiellonian University, Institute of Physics (IF UJ), Reymonta 4, Kraków 30-059, Poland
3. °Laboratori Nazionali Frascati INFN (INFN), Via E. Fermi 40, Frascati 00044, Italy
4. Dipartimento di Fisica and Unita' INFM, Universita' di Roma "La Sapienza", Piazzale Aldo Moro 2, Roma 00185, Italy
5. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland

Abstract

Data of the optical reflectivity measurements obtained in far and middle infrared regions for 11 sample of CdxHg1-xTe (x=0.06-0.7) in temperature interval from 20 K to 293 K with using of synchrotron radiation (DAFNE- LIGHT in LNF, Italy) as source are presented. The curves of Im e (w) obtained by Kramers-Kroning transformation were analyzed by  Lorentzian-approximation of dielectric function using model of deformed tetrahedra. Beside 8 canonical phonon modes observed earlier by Kozyrev et.al. [1], where the region below 120 cm-1 was excluded from consideration, the additional several  lines were observed  by us in this region. The same lines were presented in publications of another authors [2]. Our analysis is based on data for samples of different types (n- and p-type) and technology as well as on temperature dependences of the discussed line intensity in region from 70 cm-1 to 118 cm-1. This analyze shown that two kinds of lines are observed in this region: first type – generated  by electronic structure; second one – generated by oscillations in defect-bearing tatrahedra. The last one are Additional Phonon Modes observed earlier in CdTe [3]. [1] Kozyrev  et. al. Phys. Rev. B, 58,3,1374(1998), ; [2] Li Biao, Appl.phys.lett, 73,11,1538,(1998); [3] Polit J. Shereghii E.M., Cebulski J. et. Al., J. Appl. Phys.100,013521, (2006).

 

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Presentation: Oral at E-MRS Fall Meeting 2008, Symposium J, by Jacek Polit
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-04-30 13:32
Revised:   2009-06-07 00:48