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134 results on '"Vakulenko, O."'

9. Features of metabolic disorders in centenarians

Author

Topolyanskaya, S. V., primary, Eliseeva, T. A., additional, Turna, O. I., additional, Vakulenko, O. N., additional, Romanova, M. A., additional, Dvoretski, L. I., additional, Rachina, S. A., additional, Lytkina, K. A., additional, and Melkonyan, G. G., additional

Published
2022
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23. Deep level centers and their role in photoconductivity transients of InGaAs/GaAs quantum dot chains.

Author

Kondratenko, S. V., Vakulenko, O. V., Mazur, Yu. I., Dorogan, V. G., Marega Jr., E., Benamara, M., Ware, M. E., and Salamo, G. J.

Subjects
*INDIUM gallium arsenide, *GALLIUM arsenide, *QUANTUM dots, *PHOTOCONDUCTIVITY, *PHOTOLUMINESCENCE, *PHOTOEXCITATION
Abstract

The in-plane photoconductivity and photoluminescence are investigated in quantum dot-chain InGaAs/GaAs heterostructures. Different photoconductivity transients resulting from spectrally selecting photoexcitation of InGaAs QDs, GaAs spacers, or EL2 centers were observed. Persistent photoconductivity was observed at 80K after excitation of electron-hole pairs due to interband transitions in both the InGaAs QDs and the GaAs matrix. Giant optically induced quenching of in-plane conductivity driven by recharging of EL2 centers is observed in the spectral range from 0.83 eV to 1.0 eV. Conductivity loss under photoexcitation is discussed in terms of carrier localization by analogy with carrier distribution in disordered media. [ABSTRACT FROM AUTHOR]

Published
2014
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26. Effect of carrier capture by deep levels on lateral photoconductivity of InGaAs/GaAs quantum dot structures.

Author

Vakulenko, O. V., Golovynskyi, S. L., and Kondratenko, S. V.

Subjects
*ELECTRIC conductivity research, *QUANTUM dots, *SEMICONDUCTOR research, *ELECTROMAGNETIC fields, *ELECTRON research
Abstract

Having used thermally stimulated conductivity (TSC) technique, we identified deep electron traps that produce strong effects on charge carrier transport and photoconductivity in InGaAs/GaAs quantum dot (QD) structures. The values of deep levels below the conduction band of GaAs at 0.16, 0.22, and 0.35 eV are obtained from the analysis of the shapes of TSC curves after the excitation with the quanta energy hv = 0.9, 1.2, and 1.6 eV. The level 0.16 eV in depth is an effective electron trap that provides crossing of lateral conductivity with a high-resistance mode and, therefore, causes a high photocurrent sensitivity of about 3 A/W at 77 K with excitation by interband transitions in QDs. We determined the charge density of electrons captured by the (Ec - 0.16 eV) level to be 2 × 10-6 C/cm2 at 77 K that induces electric field ∼ 105 V/cm in a vicinity of QDs. The state at Ec - 0.22 eV is shown to be related to the recombination center that can hold non-equilibrium holes over a long time under the condition that the non-equilibrium holes are localized by the quantum states of QDs. In the course of long-term electron storage in a vicinity of QDs, an electron trapped at the (Ec - 0.16) eV level can be recaptured by a deeper spatially remote (Ec - 0.22 eV) level that allows the TSC peak observation at 106 K. [ABSTRACT FROM AUTHOR]

Published
2011
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34. Abstracts of articles deposited at VINITI

Author

Vakulenko, O. V., Romanenko, V. F., Shutov, B. M., Soglasnova, V. A., Khokhlov, M. Z., Volynets, F. K., Udalova, L. V., Kazankin, O. N., Korolev, A. L., Paranin, G. A., Pekerman, F. M., Tskhai, K. V., Gastilovich, E. A., Kopteva, T. S., Shigorin, D. N., Tizhovka, Zh. S., Bobkova, N. M., Tizhovka, V. V., Efryushina, N. P., Poluéktov, N. S., Novikova, G. K., Brushchenko, T. L., Kovchur, S. G., Fedorova, V. A., Kuznetsova, V. V., Ermolenko, N. N., and Gaiduk, A. P.

Published
1977
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35. THE EFFICACY AND SAFETY OF CARMOLIS GEL IN THE COMBINATION THERAPY OF KNEE OSTEOARTHRITIS: RESULTS OF A MULTICENTER CLINICAL TRIAL

Author

Denisov, I. N., primary, Zborovskaya, I. A., additional, Zavodovsky, B. V., additional, Alikhanov, B. A., additional, Karapetyan, I. V., additional, Shalygina, V. A., additional, Budushkina, V. E., additional, Vakulenko, O. Yu., additional, Nasrullaeva, A. D., additional, Sorotskaya, V. N., additional, Leonova, E. A., additional, Mironcheva, A. I., additional, and Goryachev, D. V., additional

Published
2015
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