Dr. Ramūnas Aleksiejūnas

Prof. Dr. Ramūnas Aleksiejūnas

Phone: +370 687 39 664

E-mail: 

Institute of Photonics and Nanotechnology (IPN)

Semiconductor physics

Professor

• Study of charge carrier transport and recombination properties in various modern semiconductors, with the focus on the nitride and perovskite materials;
• Study of the impact that disorder has on carrier transport in various semiconductors;
• Development and application of pump-probe techniques for carrier dynamics investigation in materials, with the focus on Light-Induced Transient Grating (LITG) and Differential Transmission (DT) techniques;
• Implementation of these techniques into the devices meant for semiconductor testing/measurements and radiation detection

ORCID: 0000-0002-9093-2252

1 K. Nomeika, Ž. Podlipskas, M. Nikitina, S. Nargelas, G. Tamulaitis, and R. Aleksiejūnas, J. Mater. Chem. C 10, 1735 (2022).

2 R. Aleksiejūnas, K. Nomeika, O. Kravcov, S. Nargelas, L. Kuritzky, C. Lynsky, S. Nakamura, C. Weisbuch, and J.S. Speck, Phys. Rev. Applied 14, 054043 (2020).

3 P. Ščajev, R. Aleksieju̅nas, P. Baronas, D. Litvinas, M. Kolenda, C. Qin, T. Fujihara, T. Matsushima, C. Adachi, and S. Juršėnas, J. Phys. Chem. C 123, 19275 (2019).

4 P. Ščajev, R. Aleksieju̅nas, S. Terakawa, C. Qin, T. Fujihara, T. Matsushima, C. Adachi, and S. Juršėnas, J. Phys. Chem. C 123, 14914 (2019).

5 Z. Podlipskas, J. Jurkevicius, A. Kadys, S. Miasojedovas, T. Malinauskas, and R. Aleksiejunas, Sci Rep 9, 17346 (2019).

6 Ž. Podlipskas, J. Jurkevičius, A. Kadys, M. Kolenda, V. Kovalevskij, D. Dobrovolskas, R. Aleksiejūnas, and G. Tamulaitis, Journal of Alloys and Compounds 89, 48 (2019).

7 P. Ščajev, C. Qin, R. Aleksieju̅nas, P. Baronas, S. Miasojedovas, T. Fujihara, T. Matsushima, C. Adachi, and S. Juršėnas, J. Phys. Chem. Lett. 9, 3167 (2018).

8 R. Aleksiejunas, Z. Podlipskas, S. Nargelas, A. Kadys, M. Kolenda, K. Nomeika, J. Mickevicius, and G. Tamulaitis, Sci Rep 8, 4621 (2018).

9 P. Ščajev, R. Aleksieju̅nas, S. Miasojedovas, S. Nargelas, M. Inoue, C. Qin, T. Matsushima, C. Adachi, and S. Juršėnas, J. Phys. Chem. C 121, 21600 (2017).

10 R. Aleksiejūnas, M. Sūdžius, T. Malinauskas, J. Vaitkus, K. Jarašiūnas, and S. Sakai, Applied Physics Letters 83, 1157 (2003).

• “Field-compensated InGaN structures as efficient cyan emitters”, Research Council of Lithuania, Scientific group project, 2022 – 2025, project leader.
• "III-nitride semiconductors for radiation-hard infrared detectors", National Research Program "Toward future technologies", 2016-2018, primary implementer.
• „Centre of technologies for remote and contactless detection of the ionizing radiations“, European Regional Development Fund activity „Promotion of centers of excellence and innovation and technology centers“,2018-2021, primary implementer.
• „Fast scintillators for radiation detectors“, European Social Fund activity „Implementing World-class R&D Projects“,2018-2022, primary implementer.
• „Neutron flux detection system with optical readout“, European Regional Development Fund activity „Implementing World-class R&D Projects (SMART)“, 2018-2022, primary implementer.
• "Perovskite laser", Research Council of Lithuania, Scientific group project, 2017-2020, primary implementer.
• „One-dimensional Nanostructures of Ternary AlGaN and metal doped- Zinc Oxide with Tuneable Bandgaps: Growth, Characterization and Optical Properties“, Lithuanian-Latvian-Taiwan mutual cooperation project, 2011-2013, primary implementer.
• „Nonlinear ex-situ optical diagnostics of nitride heterostructures for optoelectronics (OPTO)“, Global grant project, 2012-2015, primary implementer.
• „New optical measurement technologies and devices for semiconductor diagnostics“, COST Project, 2008-2011, primary implementer.
• “Plasmonic AlGaN/GaN Terahertz Emitters”, Research Council of Lithuania, Scientific group project, 2012 – 2015, project leader.
• “Novel Approach to Improvement of Ultra- Violet Detectors for Homeland Defence”, NATO SfP program grant, 2006 – 2011, Co-director in Lithuania.

“Impact of alloy disorder-induced localization on hole diffusion in highly excited c-plane and m-plane InGaN quantum wells”, Apropos-17, Vilnius 2020.

Solid State Physics (bachelor course)

Supervisor of 3 defended PhD dissertations