Linking surface chemistry to optical properties of semiconductor nanocrystals

2015 ◽  
Vol 17 (29) ◽  
pp. 18882-18894 ◽  
Author(s):  
Michael M. Krause ◽  
Patanjali Kambhampati
Keyword(s):  
Optical Properties ◽  
Surface Chemistry ◽  
Semiconductor Nanocrystals ◽  
Insight Into

This perspective gives insight into how the chemistry occurring at the surface of semiconductor nanocrystals is crucial to tailoring their optical properties to a myriad of applications.

scholarly journals pH and concentration dependence of the optical properties of thiol-capped CdTe nanocrystals in water and D2O

2016 ◽  
Vol 18 (28) ◽  
pp. 19083-19092 ◽  
Author(s):  
R. Schneider ◽  
F. Weigert ◽  
V. Lesnyak ◽  
S. Leubner ◽  
T. Lorenz ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Chemistry ◽  
Concentration Dependence ◽  
Chemical Nature ◽  
Semiconductor Nanocrystals ◽  
Surface Ligands ◽  
Cdte Nanocrystals ◽  
Ligand Bond

The optical properties of semiconductor nanocrystals (SC NCs) are largely controlled by their size and surface chemistry, i.e., the chemical nature and number of surface ligands as well as the strength of the particle-ligand bond.

Optical properties of single semiconductor nanocrystals

2006 ◽  
Vol 8 (43) ◽  
pp. 4989-5011 ◽  
Author(s):  
Daniel E. Gómez ◽  
Marco Califano ◽  
Paul Mulvaney
Keyword(s):  
Optical Properties ◽  
Semiconductor Nanocrystals

A Nanoscale Adventure with Silicon: Synthesis, Surface Chemistry, and other Surprises

2015 ◽  
Vol 242 ◽  
pp. 383-390
Author(s):  
Md Hosnay Mobarok ◽  
Tapas K. Purkait ◽  
Jonathan G.C. Veinot
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Chemistry ◽  
Research Group ◽  
Size Dependent ◽  
Earth Abundant ◽  
Potential Applications ◽  
Si Quantum Dots

The preparation and surface chemistry Si quantum dots (SiQDs) are currently an intense focus of research because of their size dependent optical properties and many potential applications. SiQDs offer several advantages over other quantum dots; Si is earth abundant, non-toxic and biocompatible. This account briefly highlights recent advancements made by our research group related to the synthesis, functionalization, surface dependent optical properties and applications of SiQDs.

Symmetry Breaking Induced Activation of Nanocrystal Optical Transitions

MRS Advances ◽  
2018 ◽  
Vol 3 (14) ◽  
pp. 711-716 ◽  
Author(s):  
Peter C. Sercel ◽  
Andrew Shabaev ◽  
Alexander L. Efros
Keyword(s):  
Optical Properties ◽  
Fine Structure ◽  
Symmetry Breaking ◽  
Semiconductor Nanocrystals ◽  
Radiative Lifetime ◽  
Multipole Expansion ◽  
Cdse Nanocrystals ◽  
Coulomb Center ◽  
Charged Center ◽  
Positively Charged

ABSTRACTWe have analysed the effect of symmetry breaking on the optical properties of semiconductor nanocrystals due to doping by charged impurities. Using doped CdSe nanocrystals as an example, we show the effects of a Coulomb center on the exciton fine-structure and optical selection rules using symmetry theory and then quantify the effect of symmetry breaking on the exciton fine structure, modelling the charged center using a multipole expansion. The model shows that the presence of a Coulomb center breaks the nanocrystal symmetry and affects its optical properties through mixing and shifting of the hole spin and parity sublevels. This symmetry breaking, particularly for positively charged centers, shortens the radiative lifetime of CdSe nanocrystals even at room temperature, in qualitative agreement with the increase in PL efficiency observed in CdSe nanocrystals doped with positive Ag charge centers [A. Sahu et.al., Nano Lett. 12, 2587, (2012)]. The effect of the charged center on the photoluminescence and the absorption spectra is shown, with and without the presence of compensating charges on the nanocrystal surface. While spectra of individual nanocrystals are expected to shift and broaden with the introduction of a charged center, configuration averaging and inhomogeneous broadening are shown to wash out these effects. The presence of compensating charges at the NC surface also serves to stabilize the band edge transition energies relative to NCs with no charge centers.

scholarly journals Insight into the structural, electronic, elastic and optical properties of the alkali hydride compounds, XH (X = Rb and Cs)

AIP Advances ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 045017
Author(s):  
Raed Jaradat ◽  
Mohammed Abu-Jafar ◽  
Issam Abdelraziq ◽  
Ahmad Mousa ◽  
Tarik Ouahrani ◽  
...  
Keyword(s):  
Optical Properties ◽  
Insight Into
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