Quantum-Size Effects on the Pressure-Induced Direct-to-Indirect Band-Gap Transition in InP Quantum Dots

1998 ◽  
Vol 80 (24) ◽  
pp. 5397-5400 ◽  
Author(s):  
Huaxiang Fu ◽  
Alex Zunger
Keyword(s):  
Quantum Dots ◽  
Band Gap ◽  
Size Effects ◽  
Quantum Size Effects ◽  
Quantum Size ◽  
Indirect Band Gap ◽  
Inp Quantum Dots

Quantum size effects on the optical band gap of microcrystalline Si:H

1988 ◽  
Vol 38 (8) ◽  
pp. 5726-5729 ◽  
Author(s):  
Shoji Furukawa ◽  
Tatsuro Miyasato
Keyword(s):  
Band Gap ◽  
Size Effects ◽  
Optical Band Gap ◽  
Quantum Size Effects ◽  
Quantum Size

Facile one-step sonochemical synthesis of AgCl quantum dots with enhanced photocatalytic activity and its size effects

2020 ◽  
Vol 13 (06) ◽  
pp. 2051036
Author(s):  
Junjie Zhang ◽  
Hujiabudula Maimaitizi ◽  
Tao Zhang ◽  
Yalkunjan Tursun ◽  
Dilinuer Talifu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Band Gap ◽  
Size Effects ◽  
Ultrasonic Method ◽  
Energy Levels ◽  
Average Diameter ◽  
Light Illumination ◽  
Quantum Size ◽  
One Step

In this work, a facile ultrasonic method for the fabrication of AgCl quantum dots (AgCl QDs) with an average diameter of about 2.5[Formula: see text]nm was reported for the first time. The material was analyzed by various techniques. In addition, effects of material’s size on its photocatalytic activities were studied. Results suggested that the AgCl QDs exhibited excellent photocatalytic activity to degrade Rhodamine B (RhB) and tetracycline (TC) under visible light illumination, and the degradation rate of RhB (TC) had reached up to 96.6% (72.2%) in 20 min, which was higher than that of AgCl nanoparticles (23[Formula: see text]nm) and AgCl nanospheres (114[Formula: see text]nm), respectively. Besides, the band gap of the material was increased when the size of material decreased from 23[Formula: see text]nm to 2.5[Formula: see text]nm. The significantly improved photocatalytic performance and increased band gap of AgCl QDs were mainly related to the quantum size effects of AgCl, which results in the more electron fluctuation in quantized energy levels and the lower recombination of electrons and holes.

NOVEL NUMERICAL METHOD FOR THE SOLUTION OF SCHRÖDINGER'S EQUATION: EXCITON ENERGY OF CdS QUANTUM DOTS

2002 ◽  
Vol 16 (27) ◽  
pp. 4093-4103 ◽  
Author(s):  
S. BASKOUTAS ◽  
M. RIETH ◽  
A. F. TERZIS ◽  
V. KAPAKLIS ◽  
C. POLITIS
Keyword(s):  
Quantum Dots ◽  
Numerical Method ◽  
Size Effects ◽  
Quantum Size Effects ◽  
Cds Quantum Dots ◽  
Exciton Energy ◽  
Mass Approximation ◽  
Quantum Size ◽  
Self Consistent ◽  
Experimental Values

Studying the quantum size effects on the exciton energy of two-dimensional CdS quantum dots in the single band effective mass approximation for both electron and hole, we use a finite confinement in the x–y plane and we assume also that the induced charge is spread along a very thin interface in the z-direction. Solving the Schrödinger equation with a new numerical method, which is called potential morphing method, we obtain the corresponding energy within the self-consistent Hartree scheme. Excellent agreement is obtained with the experimental values of exciton energies for various sizes of CdS quantum dots in the strong, medium and weak confinement limit.

QUANTUM SIZE EFFECTS ON THE ENERGY LEVELS AND FAR-INFRARED SPECTRA: CHANGES FROM QUANTUM DOTS TO QUANTUM RINGS

2007 ◽  
Vol 21 (27) ◽  
pp. 4715-4724
Author(s):  
HUI PAN
Keyword(s):  
Quantum Dots ◽  
Infrared Spectra ◽  
Size Effects ◽  
Energy Levels ◽  
Far Infrared ◽  
Electron Interaction ◽  
Quantum Size Effects ◽  
Quantum Rings ◽  
Quantum Size ◽  
Far Infrared Spectra

The energy levels and far-infrared spectra of two electrons confined in quantum dots and quantum rings under a magnetic field have been investigated. The size and shape effects of quantum rings on the levels and the spectra are clearly revealed. It is found that the spin oscillation of two electrons in a quantum ring with a magnetic field is caused by the Coulomb interaction. The transitions of two-electron far-infrared spectra are clearly shown from quantum dots to quantum rings. The influence of electron–electron interaction on the energy levels and far-infrared spectra has been discussed. The quantum size effects predict a possibility to observe phenomena related to electron-electron interaction in quantum rings.

Quantum confinement in group III–V semiconductor 2D nanostructures

Nanoscale ◽  
2020 ◽  
Vol 12 (33) ◽  
pp. 17494-17501 ◽  
Author(s):  
Luis A. Cipriano ◽  
Giovanni Di Liberto ◽  
Sergio Tosoni ◽  
Gianfranco Pacchioni
Keyword(s):  
Band Gap ◽  
Size Effects ◽  
Quantum Confinement ◽  
Quantum Size Effects ◽  
Group Iii ◽  
Quantum Size ◽  
Group Iii V Semiconductor

Band gap variation in group III–V semiconductor slabs due to quantum size effects.

Phenomenological Modeling of Confined Phonon States in TMD Quantum Dots

MRS Advances ◽  
2018 ◽  
Vol 3 (6-7) ◽  
pp. 339-344 ◽  
Author(s):  
Lu Fang ◽  
Tamia Willliam ◽  
Kofi W. Adu ◽  
Mauricio Terrones
Keyword(s):  
Quantum Dots ◽  
Size Effect ◽  
Band Gap ◽  
Bulk Material ◽  
Single Layer ◽  
Interlayer Coupling ◽  
Quantum Size Effect ◽  
Quantum Size ◽  
Indirect Band Gap ◽  
Band Gap Tuning

ABSTRACTSeveral reports have shown band-gap tuning in TMDs, from indirect band gap in the bulk material to a direct gap in single layer due to the absence of interlayer coupling. This unique property stems from the modified electronic states. The phononic properties are extremely modified as well, due to layered effect and quantum size effect. There are several reports on layered effect; however, reports on the confined phonon states in these structures are limited. Thus, we present a preliminary studies of the confined phonon states in TMDs (WS2 and MoS2) quantum dots, and elucidate on the evolution of the phonon lineshape with diameter using a phenomenological model with an envelop function that truncates the phonon wave at the surface of the quantum dot. Furthermore, we delineate the layered effect from the quantum size effect in the phonon lineshape of WS2 and MoS2.

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