Experimental observation of quantum confinement in the conduction band of PbS quantum dots

2013 ◽  
Vol 42 (4) ◽  
pp. 197-200 ◽  
Author(s):  
I. N. Demchenko ◽  
M. Chernyshova ◽  
X. He ◽  
R. Minikayev ◽  
Y. Syryanyy ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Experimental Observation ◽  
Conduction Band ◽  
Quantum Confinement ◽  
Pbs Quantum Dots

scholarly journals Experimental Observation of Quantum Confinement in the Conduction Band of CdSe Quantum Dots

2007 ◽  
Vol 98 (14) ◽  
Author(s):  
Jonathan R. I. Lee ◽  
Robert W. Meulenberg ◽  
Khalid M. Hanif ◽  
Hedi Mattoussi ◽  
John E. Klepeis ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Experimental Observation ◽  
Conduction Band ◽  
Quantum Confinement ◽  
Cdse Quantum Dots

scholarly journals XANES: observation of quantum confinement in the conduction band of colloidal PbS quantum dots

2013 ◽  
Vol 430 ◽  
pp. 012030 ◽  
Author(s):  
I N Demchenko ◽  
M Chernyshova ◽  
X He ◽  
R Minikayev ◽  
Y Syryanyy ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Conduction Band ◽  
Quantum Confinement ◽  
Pbs Quantum Dots

Charge Transfer from PbS Quantum Dots to Insulating TiO2 Matrix

1995 ◽  
Vol 382 ◽  
Author(s):  
R. Könenkamp ◽  
P. Hoyer
Keyword(s):  
Conduction Band ◽  
Quantum Confinement ◽  
Visible Spectrum ◽  
Spatial Separation ◽  
Band Alignment ◽  
Band Edge ◽  
Conduction Band Edge ◽  
Carrier Transfer ◽  
Quantum Size ◽  
Pbs Quantum Dots

ABSTRACTWe report on the photoconductivity of thin films consisting of a porous nanocrystalline TiO2 matrix and quantum size PbS clusters adsorbed on the inner surfaces of theTiO2. The PbS clusters are typically a few nm in size and are not connected. Due to quantum confinement the bandgap of the clusters is widened to around 2 eV from the 0.41 eV value for PbS bulk. The clusters thus absorb in the visible spectrum. However, due to their spatial separation, photoconductance through the film requires carrier transfer through the TiO2 matrix. Our data show this to occur only for clusters <25 Å, for which the conduction band edge lies above the TiO2 conduction band edge. For larger clusters the band alignment at the TiO2/PbS interface appears to be unfavorable for carrier transfer; these clusters do not contributeto photoconduction.

Ultrafast Electron Dynamics in Ge Quantum Dots

1999 ◽  
Vol 571 ◽  
Author(s):  
A. Stella ◽  
P. Tognini ◽  
S. De Silvestri ◽  
M. Nisoli ◽  
S. Stagira ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Conduction Band ◽  
Quantum Confinement ◽  
Spectral Feature ◽  
Wavelength Region ◽  
Electron Dynamics ◽  
Quantum Confinement Effects ◽  
Pump And Probe ◽  
Carrier Interaction ◽  
Ge Quantum Dots

ABSTRACTAn analysis of the ultrafast response of Ge quantum dots, with average radii of 4 nm and 16 nm, is reported here. Pump and probe experiments allowed investigation of the wavelength region between 450 and 750 nrm, characterized by the absorption peaks due to the E, and E1+Δ1 interband transitions. Two different time regimes have been identified: a first one (τ ≤ 1 ps) associated with pump-induced conduction band filling in the τ-L direction in the Brillouin zone; a second one (τ up to 100 ps) associated with band gap renormalization caused by the carrier interaction in the conduction band. Quantum confinement effects show up in terms of sizedependent blueshift of the E1+Δ1 spectral feature.

Absorption and emission in the visible range by ultra-small PbS quantum dots in the strong quantum confinement regime with S-terminated surfaces capped with diphenylphosphine

2021 ◽  
Vol 860 ◽  
pp. 158443
Author(s):  
Nayely Torres-Gomez ◽  
Diana F. Garcia-Gutierrez ◽  
Alan R. Lara-Canche ◽  
Lizbeth Triana-Cruz ◽  
Jesus A. Arizpe-Zapata ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Confinement ◽  
Visible Range ◽  
Absorption And Emission ◽  
Pbs Quantum Dots

Synergistic Effect Between Halide Perovskites and PbS Quantum Dots

2020 ◽  
Author(s):  
Iván Mora-Seró ◽  
Sofia Masi ◽  
David Macias-Pinilla ◽  
Carlos Echeverría-Arrondo ◽  
Juan Ignacio Climente
Keyword(s):  
Quantum Dots ◽  
Synergistic Effect ◽  
Halide Perovskites ◽  
Pbs Quantum Dots
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