Role of Surface States in Silver-Doped CdSe and CdSe/CdS Quantum Dots

2018 ◽  
Vol 122 (19) ◽  
pp. 10627-10636 ◽  
Author(s):  
David Morgan ◽  
David F. Kelley
Keyword(s):  
Quantum Dots ◽  
Surface States ◽  
Cds Quantum Dots

scholarly journals Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+ doped CdS quantum dots

RSC Advances ◽  
2021 ◽  
Vol 11 (14) ◽  
pp. 7961-7971
Author(s):  
N. D. Vinh ◽  
P. M. Tan ◽  
P. V. Do ◽  
S. Bharti ◽  
V. X. Hoa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Dopant Concentration ◽  
Core Shell ◽  
Cds Quantum Dots ◽  
Cds Qds

The role of samarium (Sm) dopant on the structural, morphological, and optical properties of CdS QDs and CdS/ZnS core/shell QDs was methodically reported.

Influence of Ionizing Radiation and the Role of Thiol Ligands on the Reversible Photodarkening of CdTe/CdS Quantum Dots

2016 ◽  
Vol 8 (12) ◽  
pp. 7869-7876 ◽  
Author(s):  
Girija Gaur ◽  
Dmitry S. Koktysh ◽  
Daniel M. Fleetwood ◽  
Robert A. Weller ◽  
Robert A. Reed ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ionizing Radiation ◽  
Cds Quantum Dots ◽  
Thiol Ligands

scholarly journals Role of Interligand Coupling in Determining the Interfacial Electronic Structure of Colloidal CdS Quantum Dots

ACS Nano ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. 1395-1403 ◽  
Author(s):  
Rachel D. Harris ◽  
Victor A. Amin ◽  
Bryan Lau ◽  
Emily A. Weiss
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Cds Quantum Dots ◽  
Interfacial Electronic Structure ◽  
Colloidal Cds

Optical and Electron Correlation Effects in Silicon Quantum Dots

2005 ◽  
Vol 23 ◽  
pp. 129-132 ◽  
Author(s):  
S.K. Ghoshal ◽  
K.P. Jain ◽  
R. Elliott
Keyword(s):  
Quantum Dots ◽  
Band Gap ◽  
Surface Passivation ◽  
Surface States ◽  
Hydrogen Atoms ◽  
Basis Expansion ◽  
Electron Correlation Effects ◽  
Homo Lumo ◽  
Pseudo Potential

We study (through computer simulation) the variation of the band gap as a function of sizes and shapes of small Silicon (Si) dots using pseudo-potential approach. We have used empirical pseudo-potential Hamiltonian and a plane wave basis expansion and a basic tetrahedral structure. It is found that the gap decreases for increasing dot size. Furthermore, the band gap increases as much as 0.13eV on passivation the surface of the dot with hydrogen. So both quantum confinement and surface passivation determine the optical and electronic properties of Si quantum dots. Visible luminescence is probably due to radiative recombination of electrons and holes in the quantum confined nanostructures. The effect of passivation of the surface dangling bonds by hydrogen atoms and the role of surface states on the gap energy as well as on the HOMO-LUMO states has also been examined. We have investigated the entire energy spectrum starting from the very low lying ground state to the very high lying excited states for silicon dots having 5, 18, 17 and 18 atoms. The results for the size dependence of the HOMO-LUMO gap and the wave functions for the bonding-antibonding states are presented and the importance of the confinement and the role of hydrogen passivation on the confinement are also discussed.

The role of the capping agent and nanocrystal size in photoinduced hydrogen evolution using CdTe/CdS quantum dot sensitizers

2020 ◽  
Vol 49 (29) ◽  
pp. 10212-10223
Author(s):  
Elisabetta Benazzi ◽  
Valerio C. Coni ◽  
Mattia Boni ◽  
Raffaello Mazzaro ◽  
Vittorio Morandi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Hydrogen Evolution ◽  
Nanocrystal Size ◽  
Capping Agent ◽  
Cds Quantum Dots ◽  
Cds Quantum Dot

Light-driven hydrogen evolution using CdTe/CdS quantum dots as sensitizers depends on the nature of the capping agent and nanocrystal size.

scholarly journals Sensitive Surface States and their Passivation Mechanism in CdS Quantum Dots

2013 ◽  
Vol 117 (41) ◽  
pp. 21609-21618 ◽  
Author(s):  
Sesha Vempati ◽  
Yelda Ertas ◽  
Tamer Uyar
Keyword(s):  
Quantum Dots ◽  
Surface States ◽  
Cds Quantum Dots

scholarly journals The Role of Intrinsic and Surface States on the Emission Properties of Colloidal CdSe and CdSe/ZnS Quantum Dots

2007 ◽  
Vol 2 (10) ◽  
pp. 512-514 ◽  
Author(s):  
Giovanni Morello ◽  
Marco Anni ◽  
Pantaleo Davide Cozzoli ◽  
Liberato Manna ◽  
Roberto Cingolani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface States ◽  
Emission Properties

Role of Alcohol in the Synthesis of CdS Quantum Dots

2020 ◽  
Vol 32 (4) ◽  
pp. 1430-1438
Author(s):  
Frank S. Riehle ◽  
Kui Yu
Keyword(s):  
Quantum Dots ◽  
Cds Quantum Dots
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