Search Results - "Dohnalova, K."

Tuning Optical Properties of Ge Nanocrystals by Si Shell by Nestoklon, M. O, Poddubny, A. N, Voisin, P, Dohnalova, K

“…We present a theoretical study of Ge-core/Si-shell nanocrystals in a wide bandgap matrix and compare the results with experimental data obtained from the…”
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Efficient optical extraction of hot-carrier energy by Saeed, S., de Jong, E. M. L. D., Dohnalova, K., Gregorkiewicz, T.

“…Light-induced generation of free charge carriers in semiconductors constitutes the physical basis of photodetection and photovoltaics. To maximize its…”
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Time-resolved photoluminescence spectroscopy of the initial oxidation stage of small silicon nanocrystals by Dohnalová, K., Kůsová, K., Pelant, I.

“…In this paper we study the influence of progressing oxidation on the photoluminescence spectra of small silicon nanocrystals (SiNCs). H-terminated SiNCs…”
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Silicon quantum dots: surface matters by Dohnalová, K, Gregorkiewicz, T, Kůsová, K

“…Silicon quantum dots (SiQDs) hold great promise for many future technologies. Silicon is already at the core of photovoltaics and microelectronics, and SiQDs…”
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Direct band gap silicon quantum dots achieved via electronegative capping by Poddubny, A. N., Dohnalová, K.

“…We propose a theoretical concept of switching between direct and indirect band gap character in silicon quantum dots (SiQDs) by the use of surface potential…”
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Optical gain of the 1.54   μ m emission in MBE-grown Si:Er nanolayers by Ha, N. N., Dohnalová, K., Gregorkiewicz, T., Valenta, J.

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Step-like enhancement of luminescence quantum yield of silicon nanocrystals by Timmerman, D., Valenta, J., Dohnalová, K., de Boer, W. D. A. M., Gregorkiewicz, T.

“…Carrier multiplication by generation of two or more electron–hole pairs following the absorption of a single photon may lead to improved photovoltaic…”
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Red spectral shift and enhanced quantum efficiency in phonon-free photoluminescence from silicon nanocrystals by Yassievich, I. N, Timmerman, D, Buma, W. J, Gregorkiewicz, T, de Boer, W. D. A. M, Dohnalová, K, Zhang, H

“…Crystalline silicon is the most important semiconductor material in the electronics industry. However, silicon has poor optical properties because of its…”
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Si nanocrystals in a distributed feedback laser cavity by Dohnalová, K., Pelant, I., Gilliot, P., Crégut, O., Hönerlage, B.

“…We investigate an optically induced distributed-feedback cavity, containing a densely packed luminescent silicon nanocrystal layer in a Si O 2 based matrix as…”
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Evaluation of free carrier losses to 1.54 μm emission in Si/Si:Er nanolayers on SOI substrate for optical gain observation by Ha, N.N., Dohnalová, K., Gregorkiewicz, T.

“…In this study we use a combination of variable stripe and shifting excitation spot methods to evaluate linear low temperature (4.2 K) optical properties of…”
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Optical gain in porous silicon grains embedded in sol-gel derived SiO2 matrix under femtosecond excitation by Luterová, K., Dohnalová, K., Švrček, V., Pelant, I., Likforman, J.-P., Crégut, O., Gilliot, P., Hönerlage, B.

“…Porous silicon grains embedded in the phosphorus doped SiO2 matrix exhibit improved photoluminesce properties and better stability in comparison with native…”
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Colloidal suspensions of silicon nanocrystals: from single nanocrystals to photonic structures by Valenta, J., Janda, P., Dohnalová, K., Nižňansky, D., Vácha, F., Linnros, J.

“…Colloidal suspesions of Si nanocrystals (NCs) are prepared from light-emitting porous Si grains obtained by mechanical pulverization of electrochemically…”
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Porous silicon grains in SiO2 matrix: Ultrafast photoluminescence and optical gain by Luterová, K., Dohnalová, K., Trojánek, F., Neudert, K., Gilliot, P., Honerlage, B., Malý, P., Pelant, I.

“…We search for the presence of stimulated emission in samples of porous silicon embedded in the sol–gel derived SiO2 matrix. By modifying the etching conditions…”
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On the origin of the fast photoluminescence band in small silicon nanoparticles by Valenta, J, Fucikova, A, Pelant, I, Kůsová, K, Dohnalová, K, Aleknavičius, A, Cibulka, O, Fojtík, A, Kada, G

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Femtosecond luminescence spectroscopy of core states in silicon nanocrystals by Žídek, K, Trojánek, F, Malý, P, Ondič, L, Pelant, I, Dohnalová, K, Šiller, L, Little, R, Horrocks, B R

“…We present a study of ultrafast carrier transfer from highly luminescent states inside the core of silicon nanocrystal (due to quasidirect transitions) to…”
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Optical gain in nanocrystalline silicon: comparison of planar waveguide geometry with a non-waveguiding ensemble of nanocrystals by Luterová, K., Cazzanelli, M., Likforman, J.-P., Navarro, D., Valenta, J., Ostatnický, T., Dohnalová, K., Cheylan, S., Gilliot, P., Hönerlage, B., Pavesi, L., Pelant, I.

“…Stimulated emission from nanocrystalline silicon in the visible has become a hot topic during the past years. Various forms of silicon nanostructures are being…”
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Emission properties of a distributed feedback laser cavity containing silicon nanocrystals by Dohnalová, K., Kůsová, K., Pelant, I., Valenta, J., Gilliot, P., Gallart, M., Crégut, O., Rehspringer, J.L., Hönerlage, B.

“…We report on light emission from silicon nanocrystals (Si-nc) in a laser cavity. Using modified electrochemical etching of Si wafers we prepare Si-nc with…”
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Closely packed luminescent silicon nanocrystals in a distributed-feedback laser cavity by Dohnalová, K, Pelant, I, Kůsová, K, Gilliot, P, Gallart, M, Crégut, O, Rehspringer, J-L, Hönerlage, B, Ostatnický, T, Bakardjeva, S

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Surface brightens up Si quantum dots: direct bandgap-like size-tunable emission by Dohnalová, Kateřina, Poddubny, Alexander N, Prokofiev, Alexei A, de Boer, Wieteke DAM, Umesh, Chinnaswamy P, Paulusse, Jos MJ, Zuilhof, Han, Gregorkiewicz, Tom

“…Colloidal semiconductor quantum dots (QDs) constitute a perfect material for ink-jet printable large area displays, photovoltaics, light-emitting diode,…”
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Enhanced photoluminescence extraction efficiency from a diamond photonic crystal via leaky modes by Ondič, L, Kůsová, K, Cibulka, O, Pelant, I, Dohnalová, K, Rezek, B, Babchenko, O, Kromka, A, Ganesh, N

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