TITLE

Freestanding spherical silicon nanocrystals: A model system for studying confined excitons

AUTHOR(S)
Goller, B.; Polisski, S.; Wiggers, H.; Kovalev, D.
PUB. DATE
July 2010
SOURCE
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the light emitting properties of freestanding hydrogen-terminated spherical silicon nanocrystals. The nanocrystals exhibit size-dependent tunable light emission properties. Many light emission properties of this system are found to be very similar to those known for other systems containing silicon nanocrystals. However, we found specific emission properties of this system ascribed to the spherical shape of silicon nanocrystals and their spatial separation. We attributed all observations to the spatial confinement of excitons within the crystalline core of the indirect band gap silicon nanocrystals.
ACCESSION #
52616477

 

Related Articles

  • Multiexciton Absorption Cross Sections of CdSe Nanocrystals at Band-Edge Energy. Lenngren, N.; Garting, T.; Zheng, K.; Abdellah, M.; Lascoux, N.; Ma, F.; Yartsev, A.; Žídek, K.; Pullerits, T. // EPJ Web of Conferences;2013, Issue 41, p04034-p.1 

    Picosecond transient absorption signals of two kinds of cadmium selenide quantum dots were measured at various excitation intensities. The average number of excitons per quantum dot was calculated from a Poisson model, which together with kinetic parameters was used to determine exciton...

  • Fluorescent Semiconductor Nanocrystals, A Promising Fluorescent Anti-Counterfeiting Material for Specialty Paper. Qijie Chen; Fushan Chen; Yongxiang Yan // BioResources;2013, Vol. 8 Issue 1, p6 

    Fluorescent semiconductor nanocrystals, also called quantum dots (QDs), have unique electronic and optical properties. One of the most useful features of QDs is that whereas their absorption spectra are broad, their emission spectra are very narrow. Different QDs can emit different wavelengths...

  • Influence of interfacial oxide on the optical properties of single layer CdTe/CdS quantum dots in porous silicon scaffolds. Gaur, Girija; Koktysh, Dmitry S.; Fleetwood, Daniel M.; Weller, Robert A.; Reed, Robert A.; Weiss, Sharon M. // Applied Physics Letters;8/10/2015, Vol. 107 Issue 6, p063106-1 

    Using a combination of continuous wave and time-resolved spectroscopy, we study the effects of interfacial conditions on the radiative lifetimes and photoluminescence intensities of sub-monolayer colloidal CdTe/CdS quantum dots (QDs) embedded in a three-dimensional porous silicon (PSi) scaffold....

  • Ultrafast phase dynamics of ellipsometry based on spin dichroism in nanocrystal quantum dots. Kyhm, Ji-Hoon; Kyhm, Kwangseuk // AIP Conference Proceedings;12/22/2011, Vol. 1399 Issue 1, p719 

    We address a practical polarization modulator based on spin-dichroism in nanocrystal quantum dots at room temperature. Based on nonlinear refractive indices of the fine exciton states in CdSe/ZnS nanocrystal quantum dots, the polarization dynamics was mapped in Poincaré sphere, where the...

  • ZnS: Mn-SPP semiconductor nanocrystals: Synthesis and optical and structural characterization. Rahdar, A. // Indian Journal of Science & Technology;Sep2012, Vol. 5 Issue 9, p3307 

    The present paper reports the synthesis and characterization of Nano crystals of manganese doped zinc sulphide, which were prepared by co-precipitation method using the solution of zinc chloride ,sodium sulphide and manganese chloride, whereas sodiumpolyphosphate(SPP) was used as an capping...

  • Coupling Single Giant Nanocrystal Quantum Dots to the Fundamental Mode of Patch Nanoantennas through Fringe Field. Wang, Feng; Karan, Niladri S.; Minh Nguyen, Hue; Ghosh, Yagnaseni; Hollingsworth, Jennifer A.; Htoon, Han // Scientific Reports;9/25/2015, p14313 

    Through single dot spectroscopy and numerical simulation studies, we demonstrate that the fundamental mode of gold patch nanoantennas have fringe-field resonance capable of enhancing the nano-emitters coupled around the edge of the patch antenna. This fringe-field coupling is used to enhance the...

  • Magnetoexcitons in type-II quantum dots. Kalameitsev, A. B.; Kovalev, V. M.; Govorov, A. O. // JETP Letters;10/25/98, Vol. 68 Issue 8, p669 

    The ground state of a spatially indirect exciton in type-II quantum dots with a short-range potential acquires nonzero angular momentum in the presence of a magnetic field oriented perpendicular to the plane of the system. The critical magnetic field of the transition to a ground state with...

  • Fine structure of excitonic levels in quantum dots. Dzhioev, R. I.; Zakharchenya, B. P.; Ivchenko, E. L.; Korenev, V. L.; Kusraev, Yu. G.; Ledentsov, N. N.; Ustinov, V. M.; Zhukov, A. E.; Tsatsul’nikov, A. F. // JETP Letters;5/25/97, Vol. 65 Issue 10, p804 

    The experimental results of a study of the fine structure of the levels of excitons localized in InAlAs quantum dots in an AlGaAs matrix are reported. Transformations from optical orientation to alignment and from alignment to orientation, which occur due to the exchange splitting of a...

  • Spectral decomposition of excitons confined in a quantum dot by a parabolic potential and under... Qiao, Bi; Ruda, Harry E. // Journal of Applied Physics;7/15/1998, Vol. 84 Issue 2, p1052 

    Examines spectral decomposition of excitons confined in a quantum dot and influenced by an external electromagnetic field. In-depth look at the spectral decomposition of the Hamiltonian of N excitons; Information on the subdynamics formulation of N excitons in a quantum dot; Description of the...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics