Raman investigations of In(Ga)As/Al(Ga)As self-assembled quantum dot structures: from ensembles to single quantum dots
Zusammenfassung der Projektergebnisse
The project dealt with the study of vibrational properties of so-called quantum dots which have sizes in the nanometer range. Due to their small size and the typically very low Raman scattering cross section reasonable signals are only obtained by Raman spectroscopy if there is an ensemble of many of these quantum dots. One Major aim of this project was thus to define strategies how to enhance the Raman signals in such a way that finally the Raman spectrum of a single quantum dot can be obtained. For this purpose it was forseen to predominantly study InGaAs-based quantum dots which were grown using molecular beam epitaxy in the Stransky-Krastanov growth mode. While significant progress was made in the characterization of such quantum dots during the duration of the project, it turned out that another growth technique, namely the Langmuir-Blodgett technique, provides a method that can produce quantum dots of extremely high crystalline quality on surfaces for which the areal density can be controlled in such a manner that there are only very few quantum dots which contribute to the Raman spectrum. While both types of quantum dots were thoroughly investigated the latter served for exploring strategies including surface enhanced and tip enhanced (resonant) Raman spectroscopies. The marked enhancements achieved showed the way to measure the Raman spectrum of a single quantum dot. The realization was only achieved recently in the cooperation between the participating groups. The work performed in this project was the basis for a Volkswagen Trilat project between the Institutes of Semiconductor Physics in Novosibirsk and Kiev and the Semiconductor Physics group in Chemnitz entitled “New functionalities of semiconductor nanocrystals by controllable coupling to molecules”.
Projektbezogene Publikationen (Auswahl)
- Chinese Journal of Physics, 49 (2011) 71: Raman Study of Atomic Intermixing in InAs/AlAs Quantum Dots
A. Milekhin, A. Toropov, A. Kalagin, D.R.T. Zahn
- J. Phys. Chem. C, 116 (32) (2012) 17164: Raman Scattering for Probing Semiconductor Nanocrystals Arrays with a Low Areal Density
A.G. Milekhin, N.A. Yeryukov, L.L. Sveshnikova, T.A. Duda, S.S. Kosolobov, A.V. Latyshev, N.V. Surovtsev, S.V. Adichtchev, C. Himcinschi, E.I. Zenkevich, W.-B. Jian, D.R.T. Zahn
(Siehe online unter https://doi.org/10.1021/jp210720v) - Nanoscale Res. Lett., 7 (2012) 476: Raman Scattering of InAs/AlAs Quantum Dot Superlattices Grown on (001) and (311)B GaAs Surfaces
A.G. Milekhin, N.Yeryukov, A. Toropov, D. Dmitriev, E. Sheremet, D.R.T. Zahn
(Siehe online unter https://doi.org/10.1186/1556-276X-7-476) - J. Vac. Sci. Technol. B, 31 (4) (2013) 04D109-1: CdZnS Quantum Dots Formed by the Langmuir-Blodgett Technique
A.G. Milekhin, N.A. Yeryukov, L.L. Sveshnikova, T.A. Duda, D.Yu. Protasov, A.K. Gutakovskii, S.A. Batcanov, N.V. Surovtsev, S.V. Adichtchev, C. Himcinschi, V. Dzhagan, F. Haidu, D.R.T. Zahn
(Siehe online unter https://doi.org/10.1116/1.4810782) - Thin Solid Films, 543 (2013) 23: Micro-Raman Phonon Scattering by InAs/AlAs Quantum Dot Superlattices
A.G. Milekhin, N.A. Yeryukov, A.I. Toropov, D.R.T. Zahn
- Thin Solid Films, 543 (2013) 35: Surface Enhanced Raman Scattering by Organic and Inorganic Semiconductors Formed on Laterally Ordered Arrays of Au Nanoclusters
A.G. Milekhin, N.A. Yeryukov, L.L. Sveshnikova, T.A. Duda, E.E. Rodyakina, E.S. Sheremet, M. Ludemann, O.D. Gordan, A.V. Latyshev, D.R.T. Zahn
- Physica E, 57 (2014) 1-5: Study of Phonons in Self-Assembled InAs Quantum Dots Embedded in an InGaAlAs Matrix
Y. Kamikawa-Shimizu, R. Patterson, A. Milekhin, K. Akahane, Y. Shoji, D.R.T. Zahn, Y. Okada, G. Conibeer
(Siehe online unter https://doi.org/10.1016/j.physe.2013.10.023) - Material Research Express 2 (2015) 035003: Raman, AFM, and TEM Profiling of QD Multilayer Structures
E. Sheremet, A. Milekhin, R.D. Rodriguez, D. Dmitriev, A. Toropov, A. Gutakovskii, D. Dentel, W. Grünewald, M. Hietschold, D.R.T. Zahn
(Siehe online unter https://doi.org/10.1088/2053-1591/2/3/035003) - Phys.Chem.Chem.Phys. 17 (2015) 21198: Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals
E. Sheremet, A. G. Milekhin, R. D. Rodriguez, T. Weiss, M. Nesterov, E. E. Rodyakina, O. D. Gordan, L. L. Sveshnikova, T. A. Duda, V. A. Gridchin, V. M. Dzhagan, M. Hietschold, D. R. T. Zahn
(Siehe online unter https://doi.org/10.1039/c4cp05087h)
