We performed the studies of optical, photoelectric, and transport properties of a hydrothermal bulk n-type ZnO crystal by using the contactless optical techniques: photoluminescence, light-induced transient grating, and differential reflectivity. Optical studies revealed bound exciton and defect-related transitions between the donor states (at ∼60 meV and ∼240 meV below the conduction band) and the deep acceptor states (at 0.52 eV above the valence band). The acceptor state was ascribed to VZn, and its thermal activation energy of 0.43 eV was determined. A low value of carrier diffusion coefficient (∼0.1 cm2/s) at low excitations and temperatures up to 800 K was attributed to impact the recharged deep acceptors. Electron and hole mobilities of 140 and ∼80 cm2/Vs, correspondently, were determined at room temperature. The decrease of carrier lifetime with excitation was ascribed to increasing rate of radiative recombination at low temperatures and nonradiative recombination above the room temperature.
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7 April 2016
Research Article|
April 04 2016
Photo-electrical and transport properties of hydrothermal ZnO
P. Onufrijevs
;
P. Onufrijevs
a)
1Institute of Technical Physics, Faculty of Materials Science and Applied Chemistry,
Riga Technical University
, 3/7 Paula Valdena Str., LV-1048 Riga, Latvia
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P. Ščajev;
P. Ščajev
2Institute of Applied Research,
Vilnius University
, Sauletekio Ave. 3, Vilnius 10222, Lithuania
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K. Jarašiūnas;
K. Jarašiūnas
3Department of Semiconductor Physics,
Vilnius University
, Sauletekio Ave. 3, Vilnius 10222, Lithuania
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A. Medvid;
A. Medvid
1Institute of Technical Physics, Faculty of Materials Science and Applied Chemistry,
Riga Technical University
, 3/7 Paula Valdena Str., LV-1048 Riga, Latvia
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V. Korsaks;
V. Korsaks
4Institute of Solid State Physics,
University of Latvia
, 8 Kengaraga Str., 1063 Riga, Latvia
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N. Mironova-Ulmane;
N. Mironova-Ulmane
4Institute of Solid State Physics,
University of Latvia
, 8 Kengaraga Str., 1063 Riga, Latvia
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M. Zubkins
;
M. Zubkins
4Institute of Solid State Physics,
University of Latvia
, 8 Kengaraga Str., 1063 Riga, Latvia
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H. Mimura
H. Mimura
5Research Institute of Electronics,
Shizuoka University
, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8011, Japan
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a)
Author to whom correspondence should be addressed. Electronic mail: onufrijevs@latnet.lv. Tel.: +37167089160. Fax: +37167089074. Present address: Pavels Onufrijevs at Research Laboratory of Semiconductor Physics, Institute of Technical Physics, Riga Technical University, 3/7 Paula Valdena Str., Riga LV-1048, Latvia.
J. Appl. Phys. 119, 135705 (2016)
Article history
Received:
January 07 2016
Accepted:
March 17 2016
Citation
P. Onufrijevs, P. Ščajev, K. Jarašiūnas, A. Medvid, V. Korsaks, N. Mironova-Ulmane, M. Zubkins, H. Mimura; Photo-electrical and transport properties of hydrothermal ZnO. J. Appl. Phys. 7 April 2016; 119 (13): 135705. https://doi.org/10.1063/1.4945016
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