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1
Content available remote 3D Laser Microscopy for Nanotechnology and Metrology
100%
Yatsunenko S. , Fabich M.
Acta Physica Polonica A
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2009
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tom 116
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nr S
S-194-S-195
2
Content available remote Effect of Annealing on the Crystal Structure and Microstructure of Pr Doped ZrO_{2}-Y_{2}O_{3} Nanocrystals
70%
Werner-Malento E. , Paszkowicz W. , Fidelus J. , Godlewski M. , Yatsunenko S.
Acta Physica Polonica A
|
2010
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tom 117
|
nr 1
91-97
EN
Rare-earth doped nanocrystalline yttria-stabilized zirconia (YSZ, ZrO_{2}-Y_{2}O_{3}) is, recently, a subject of studies because of its luminescent properties. The luminescence may be strongly influenced by the crystal structure and microstructure of the material. In this work, the X-ray diffraction study for Pr doped YSZ nanocrystals is presented. The phase composition dependence on the Y_{2}O_{3} content and on heat treatment conditions is quantitatively determined using the Rietveld method and the similarities and differences between the present data for doped samples and earlier reported data for undoped material are discussed. A formation of high symmetry phases (cubic and tetragonal) is observed for high yttria content in agreement with general tendencies observed in literature for undoped samples.
3
Content available Growth and Characterization of ZnO Nanoparticles
61%
Tomaszewska-Grzęda A. , Łojkowski W. , Godlewski M. , Yatsunenko S. , Drozdowicz-Tomsia K. , Goldys E. , Phillips M.
Acta Physica Polonica A
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2005
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tom 108
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nr 5
897-902
EN
In this work we evaluate structural and optical properties of ZnO nanoparticles grown by wet chemistry method. Light emission properties of these nanoparticles are studied with cathodoluminescence and micro-photoluminescence. Even at the room temperature excitonic emission is well resolved, due to high exciton binding energy of ZnO. Decay kinetics of photoluminescence emissions and efficiency of inter-nanoparticles energy migration is evaluated from maps of in-plane variations of photoluminescence decay times measured in microphotoluminescence setup.
4
Content available Dynamics of Light Emission in CdMnS Nanoparticles
61%
Godlewski M. , Yatsunenko S. , Drozdowicz-Tomsia K. , Goldys E. , Phillips M. , Klar P. , Heimbrodt W.
Acta Physica Polonica A
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2005
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tom 108
|
nr 4
681-688
EN
We demonstrate coexistence of slow and fast components of photoluminescence decay of the Mn^{2+} intra-shell emission in nanoparticles of CdMnS. We explain the observed decrease in PL lifetime of the Mn^{2+} intra-shell transition by high efficiency of spin dependent magnetic interactions between localized spins of Mn^{2+} ions and free carriers. This mechanism is enhanced in nanostructures, but it is also present in bulk samples.
5
Content available Origin of Ultrafast Component of Photoluminescence Decay in Nanostructures Doped with Transition Metal or Rare-Earth Ions
51%
Godlewski M. , Yatsunenko S. , Ivanov V. , Khachapuridze A. , Świątek K. , Goldys E. , Phillips M. , Klar P. , Heimbrodt W.
Acta Physica Polonica A
|
2005
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tom 107
|
nr 1
65-74
EN
Bulk samples, layers, quantum well, and quantum dot structures of II-Mn-VI samples all show coexistence of slow and fast components of Mn^{2+} photoluminescence decay. Thus, fast photoluminescence decay cannot be related to low dimensionality of a host material. This also means that the model of the so-called quantum confined atom is incorrect. Based on the results of time-resolved photoluminescence and optically detected magnetic resonance investigations we relate the observed lifetime decrease in Mn^{2+} intra-shell transition to spin dependent magnetic interactions between localized spins of Mn^{2+} ions and between Mn^{2+} ions and spins/magnetic moments of free carriers. The latter mechanism is enhanced in nanostructures.
6
Content available remote Characterization of ZnO Films Grown at Low Temperature
51%
Przeździecka E. , Krajewski T. , Wójcik-Głodowska A. , Yatsunenko S. , Łusakowska E. , Paszkowicz W. , Guziewicz E. , Wachnicki Ł. , Szczepanik A. , Godlewski M.
Acta Physica Polonica A
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2008
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tom 114
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nr 5
1303-1310
EN
ZnO thin films were grown by atomic layer deposition method at extremely low temperature using a reactive diethylzinc as a zinc precursor. Optical properties, electrical properties and surface morphology were examined by photoluminescence, Hall effect and atomic force microscope. The study shows correlation between optical, electrical properties and surface morphology in a series of samples of different thickness.
7
Content available Spin Dependent Interactions of Free Carriers and Manganese Ions in Nanostructures of Wide Band Gap II-Mn-VI Semiconductors - Mechanism of Lifetime Reduction
41%
Yatsunenko S. , Khachapuridze A. , Ivanov V. , Godlewski M. , Khoi L. , Gołacki Z. , Karczewski G. , Goldys E. , Phillips M. , Klar P. , Heimbrodt W.
Acta Physica Polonica A
|
2003
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tom 103
|
nr 6
643-648
EN
Based on the results of optically detected magnetic resonance and time-resolved investigations we relate the observed lifetime shortening of intra-shell Mn^{2+} emission to spin dependent magnetic interactions between localized spins of Mn^{2+} ions and spins/magnetic moments of free carriers. We show that this mechanism is active in both bulk and in low dimensional structures, such as quantum wells, quantum dots, and nanostructures.
8
Content available remote Extra-Low Temperature Growth of ZnO by Atomic Layer Deposition with Diethylzinc Precursor
41%
Kowalik I. , Guziewicz E. , Kopalko K. , Yatsunenko S. , Godlewski M. , Wójcik A. , Osinniy V. , Krajewski T. , Story T. , Łusakowska E. , Paszkowicz W.
Acta Physica Polonica A
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2007
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tom 112
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nr 2
401-406
EN
ZnO thin films were grown on silicon substrate by atomic layer deposition method. We explored double-exchange chemical reaction and used very volatile and reactive diethylzinc as a zinc precursor. These enables us to obtain zinc oxide thin films of high quality at extremely low growth temperature (90-200ºC). The films are polycrystalline as was determined by X-ray diffraction and show flat surfaces with roughness of 1-4 nm as derived from atomic force microscopy measurements. Photoluminescence studies show that an edge emission of excitonic origin is observed even at room temperature for all investigated ZnO layers deposited with the diethylzinc precursor.
9
Content available Microwave-Induced Delocalization of Excitons in Ternary Compounds of II-VI and III-V Semiconductors
41%
Ivanov V. , Godlewski M. , Khachapuridze A. , Yatsunenko S. , Wojtowicz T. , Karczewski G. , Bergman J. , Monemar B. , Shamirzaev T. , Zhuravlev K. , Leonardi K. , Hommel D.
Acta Physica Polonica A
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2003
|
tom 103
|
nr 6
559-566
EN
In this work we employ technique of optically detected cyclotron resonance for evaluation of the role of localization processes in CdTe/CdMnTe and CdMnTe/CdMgTe quantum well structures. From microwave-induced changes of excitonic emissions we evaluate magnitude of potential fluctuations (Stokes shift), correlate optically detected cyclotron resonance results with the results of time-resolved experiments and discuss nature of recombination processes in the limit of a strong localization.
10
Content available Magnetic, Structural, and Optical Properties of Low Temperature ZnMnO Grown by Atomic Layer Epitaxy
41%
Wójcik A. , Kiecana M. , Kopalko K. , Godlewski M. , Guziewicz E. , Yatsunenko S. , Łusakowska E. , Minikayev R. , Paszkowicz W. , Świątek K. , Wilamowski Z. , Sawicki M. , Dietl T.
Acta Physica Polonica A
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2005
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tom 108
|
nr 5
915-921
EN
Magnetic, structural, and optical properties of ZnMnO films grown with atomic layer epitaxy are discussed. Atomic layer epitaxy films were grown at low temperature using organic zinc and manganese precursors. From magnetometry and electron spin resonance investigations we conclude that lowering of a growth temperature significantly limits formation of Mn precipitates and inclusions of different foreign phases of manganese oxides to ZnMnO host.
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