Loosening Quantum Confinement: Observation of Real Conductivity Caused by Hole Polarons in Semiconductor Nanocrystals Smaller than the Bohr Radius

Nano Letters ◽  
2012 ◽  
Vol 12 (9) ◽  
pp. 4937-4942 ◽  
Author(s):  
Ronald Ulbricht ◽  
Joep J. H. Pijpers ◽  
Esther Groeneveld ◽  
Rolf Koole ◽  
Celso de Mello Donega ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Semiconductor Nanocrystals ◽  
Bohr Radius

Quantum confinement in silver selenide semiconductor nanocrystals

2012 ◽  
Vol 48 (44) ◽  
pp. 5458 ◽  
Author(s):  
Ayaskanta Sahu ◽  
Ankur Khare ◽  
Donna D. Deng ◽  
David J. Norris
Keyword(s):  
Quantum Confinement ◽  
Semiconductor Nanocrystals ◽  
Silver Selenide

scholarly journals Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius

2020 ◽  
Vol 152 (11) ◽  
pp. 110902 ◽  
Author(s):  
James Cassidy ◽  
Mikhail Zamkov
Keyword(s):  
Quantum Dots ◽  
Quantum Confinement ◽  
Bohr Radius

Fascinating World of Nanomaterials, Applications and Technology Hurdles in Commercial Production

2009 ◽  
Vol 1209 ◽  
Author(s):  
Shiva Hullavarad ◽  
Nilima Hullavarad
Keyword(s):  
Quantum Confinement ◽  
Building Blocks ◽  
Semiconductor Nanostructures ◽  
Commercial Production ◽  
Scientific Field ◽  
Bohr Radius ◽  
Semiconducting Nanowires ◽  
Size Dependent ◽  
Low Dimensional ◽  
De Broglie Wavelength

AbstractNanoparticles, nanowires, nanorods and other kinds of nanostructures have been of great interest to scientific field. Semiconducting nanowires have attracted much attention due to the fact that reduced dimensional confinement of electrons, holes and photons make them particularly attractive as potential building blocks for nanoscale optoelectronic devices, highly quantum efficient lasers and non-linear optical converters. It is generally accepted that the low dimensional structures (where the size in one direction is equivalent to or smaller than the de Broglie wavelength) are useful materials for investigating the dependence of electrical and thermal transport or mechanical properties on the dimensionality and quantum confinement. Nanomaterials also play an important role as functional units in fabricating the electromechanical devices. Semiconductor nanostructures of different materials and shapes are investigated due to their size dependent electronic properties observable at dimensions comparable to or less than Bohr radius of exciton in these materials. Especially various oxides and sulphides have generated interests in variety of applications. In this paper, the recent progress in various nanostructures, paradigms in implementation and technology hurdles in implementing nanostructures are discussed

Localization and Dynamics of Long-Lived Excitations in Colloidal Semiconductor Nanocrystals with Dual Quantum Confinement

ChemPhysChem ◽  
2015 ◽  
Vol 16 (8) ◽  
pp. 1663-1669 ◽  
Author(s):  
Su Liu ◽  
Nicholas J. Borys ◽  
Sameer Sapra ◽  
Alexander Eychmüller ◽  
John M. Lupton
Keyword(s):  
Quantum Confinement ◽  
Semiconductor Nanocrystals ◽  
Colloidal Semiconductor Nanocrystals ◽  
Colloidal Semiconductor ◽  
Dual Quantum

Impact of quantum confinement on the optical nonlinearities of semiconductor nanocrystals

1990 ◽  
Author(s):  
Christos Flytzanis ◽  
Francois Hache ◽  
Maurice C. Klein ◽  
Daniel Ricard
Keyword(s):  
Quantum Confinement ◽  
Semiconductor Nanocrystals ◽  
Optical Nonlinearities

Nanocrystals and nano-optics

1995 ◽  
Vol 353 (1703) ◽  
pp. 313-321 ◽  
Keyword(s):  
Optical Spectroscopy ◽  
Quantum Confinement ◽  
Near Field ◽  
Science And Technology ◽  
Semiconductor Nanocrystals ◽  
Single Molecules ◽  
Three Dimensional ◽  
Nanometer Scale ◽  
New Science

Three dimensional electronic quantum confinement in semiconductor nanocrystals, and near-field optical spectroscopy of single molecules, are briefly discussed as examples of new science and technology at the nanometer scale.

Structural Studies of ZnS Nanoparticles by High Resolution Transmission Electron Microscopy

2010 ◽  
Vol 9 ◽  
pp. 125-132 ◽  
Author(s):  
V.L. Gayou ◽  
B. Salazar Hernández ◽  
R. Delgado Macuil ◽  
G. Zavala ◽  
P. Santiago ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Laser Scanning ◽  
Semiconductor Nanocrystals ◽  
Laser Scanning Microscopy ◽  
Bohr Radius ◽  
Zns Nanoparticles ◽  
Transmission Electron ◽  
Z Contrast

Zinc sulfide (ZnS), a representative of wide band gap semiconductor nanocrystals, has an excitonic Bohr radius (aBZnS ) of 2.5 nm. It makes ZnS nanoparticles (ZnS NP) having such size very interesting as small biomolecular probes for fluorescence and laser scanning microscopy. To date, ZnS NP of diameters larger than aBZnS has been subject of extensive experimental and theoretical studies. However many questions remain open concerning the synthesis of undoped and uncapped ZnS NP of diameters less than 2.5 nm. To further probe into the physical properties of undoped and uncapped ZnS NP, in this work we report on studies of uncapped ZnS nanoparticles synthesized by a wet chemical process at room temperature. Three colloidal suspensions (named A, B and C, respectively) were obtained from 9:1, 1:1 and 1:9 volume mixtures of 1mM ZnSO4 and 0.85mM Na2S aqueous solutions. Qualitative differences in UV-Vis absorption spectra are discussed in the context of Z-contrast scanning transmission electron microscopy (Z-contrast), low and high resolution transmission electron microscopy (TEM) results. Distribution of particle size is dependent on different volumes of source solutions. For the intermediate mixture, it has been found that about 78% of ZnS nanoparticles have a diameter smaller than the excitonic Bohr Radius of 2.5 nm. HRTEM studies have revealed that nanoparticles grow preferentially with hexagonal structure.

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