[institut] Reminder - Photonics Center seminar, Wednesday, 22nd May 2019, 11:00

[Dr. Dragan D. Markushev]

Dear colleagues,

you are cordially invited to the Photonics Center seminar of the 
Laboratory for Photoacoustics, which will be held on Wednesday, 22nd May 
2019 at 11:00 in the library reading room "Dr Dragan Popović" of the 
Institute of Physics Belgrade. The talk entitled

                               "The growth and properties of mixed 
Cd1-xZnxTe alloys"

will be given by Dr Hab. Inž. Karol Strzałkowski from the Institute of 
Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus 
Copernicus University, Grudziadzka 5, 87-100 Torun, Poland 
(https://www.ifiz.umk.pl/en/science/).

The abstract of the talk is provided below.


Investigated in this work mixed Cd1-xZnxTe compounds are interesting 
materials for modern electronics and materials science. CdTe based 
crystals are promising materials as x-ray and gamma-ray detectors [1] 
but also substrate for infrared sensors (HgCdTe) [2]. The variation in 
composition allows tuning of their fundamental parameters like energy 
band-gap and lattice constant, which is very important from an 
application point of view.
Cd1-xZnxTe mixed crystals investigated in this work were grown from the 
melt by vertical Bridgman-Stockbarger method in the whole range of 
composition 0<x<1 that is from one binary crystal (CdTe) to another 
(ZnTe). The real composition of grown crystals was measured with SEM/EDS 
method along the growth axis. The segregation coefficient of Zn in CdTe 
matrix has been evaluated as close to unity. The energy gap as a 
function of the composition was determined from transmission 
spectroscopy. Thanks to that bowing parameter of this ternary alloy were 
found to be 0.458. In this work, for the first time, the systematical 
study of thermal properties of Cd1-xZnxTe alloys from one binary crystal 
(CdTe) to another (ZnTe) grown by vertical Bridgman technique was 
undertaken. The thermal diffusivity and effusivity of investigated 
crystals were derived from the experimental data and allowed calculating 
the thermal conductivity. Diagrams of the thermal conductivity versus 
composition were analyzed applying the model for mixed semiconducting 
crystals given by Sadao Adachi [3]. Thanks to that contribution of the 
thermal resistivity arising from the lattice disorder to the total 
resistivity of the crystal have been determined.



Selected publications:

[1] A. Alaoui-Belghiti, A. Hajjaji, S. Laasri, H. Lif, K. Strzałkowski, 
P. Płóciennik, A. Zawadzka, A. Laghzizil
"Investigation of thermal properties and energy harvesting of the 
Pb(Mg1/3Nb2/3)1-xTixO3 perovskite single crystals"
THERMOCHIM ACTA 672 (2019), 118-125
DOI: 10.1016/j.tca.2018.12.018

[2] B. Derkowska-Zielińska, K. Strzałkowski, L. Skowronski, J. 
Zakrzewski, M. Pawlak, F. Firszt
"Correlation between optical and thermal properties in ZnMgSe solid 
solutions"
Mater. Chem. Phys. 186 (2017), 541-545
DOI: 10.1016/j.matchemphys.2016.11.034

[3] K. Strzałkowski, F. Firszt, A. Marasek
"Photoluminescence of ZnBeMnSe solid solutions"
J. Lumin. 184 (2017), 29-37
DOI: 10.1016/j.jlumin.2016.12.010

[4] M. Pawlak, M.Streza, C.Morari, K. Strzałkowski, M.Depriester, 
M.Chirtoc
"Quantitative Thermal Wave Phase Imaging of an IR semi-transparent GaAs 
wafer using IR lock-in thermography"
Meas. Sci. Technol. 28 (2017), 025008 -(11)
DOI: 10.1088/1361-6501/aa4f69

[5] M. Streza, S. Longuemart, E. Guilmeau, K. Strzałkowski, K. Touati, 
M. Depriester, A. Maignan, A. Hadj Sahraoui
"An active thermography approach for thermal and electrical 
characterization of thermoelectric materials"
J. Phys. D: Appl. Phys. 49 (2016), 285601-285601-6
DOI: 10.1088/0022-3727/49/28/285601

To see more, please visit 
https://www.fizyka.umk.pl/en/publications/?id_prac=133
https://www.ifiz.umk.pl/en/institute/department-and-labs/dap/dap-people/

Best regards,
Dr Dragan D. MARKUSHEV

-- 
Dr Dragan D. MARKUSHEV
Principal Research Fellow
Photonics Center
Head of Laboratory for Photoacoustics
Institute of Physics Belgrade
Pregrevica 118,
11080 Belgrade, SERBIA
cell: +381603169816
phone: +381113713158
fax: +381113162190
http://photonics.ipb.ac.rs/
http://www.ipb.ac.rs/