Fundamentals of the Quantum Confinement Effect

2016 ◽  
pp. 291-318 ◽  
Keyword(s):  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect

Tunable Quantum Confinement Effect on Non-volatile Thin Film Polymer Memory Device

2008 ◽  
Author(s):  
Augustin J. Hong ◽  
Kang L. Wang ◽  
Wei Lek Kwan ◽  
Yang Yang ◽  
Dayanara Parra ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Memory Device ◽  
Confinement Effect ◽  
Film Polymer ◽  
Polymer Memory

Quantum confinement effect in nanocomposites

2001 ◽  
Vol 182 (3-4) ◽  
pp. 251-257 ◽  
Author(s):  
D. Chakravorty ◽  
S. Banerjee ◽  
T.K. Kundu
Keyword(s):  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect

Size-dependent penetration of carbon dots inside the ferritin nanocages: evidence for the quantum confinement effect in carbon dots

2015 ◽  
Vol 17 (19) ◽  
pp. 12833-12840 ◽  
Author(s):  
Arpan Bhattacharya ◽  
Surajit Chatterjee ◽  
Roopali Prajapati ◽  
Tushar Kanti Mukherjee
Keyword(s):  
Carbon Dots ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Size Dependent ◽  
Pl Quenching

Size-dependent penetration of CDs through the ferritin channels has been successfully demonstrated by means of λex-dependent PL quenching of CDs by the Fe3+ ions of ferritin.

SIZE-DEPENDENT NONRESONANT THIRD-ORDER NONLINEAR SUSCEPTIBILITIES OF CdS CLUSTERS FROM 7 TO 120 Å

1992 ◽  
Vol 01 (04) ◽  
pp. 683-698 ◽  
Author(s):  
YING WANG ◽  
NORMAN HERRON
Keyword(s):  
Refractive Index ◽  
Quantum Confinement ◽  
Optical Switching ◽  
Quantum Confinement Effect ◽  
Surrounding Medium ◽  
Confinement Effect ◽  
Third Order ◽  
Size Dependent ◽  
Size Regime ◽  
Fundamental Wavelength

We report the third-order nonlinear susceptibilities χ(3) of CdS clusters (quantum dots) from 7 to 120 Å, measured by third-harmonic generation technique at a fundamental wavelength of 1.91 µm. In the size regime studied, the value of χ(3) first increases with cluster size and then levels off for cluster diameter larger than 60 Å. The volume normalized χ(3) of CdS cluster is about a factor of 2 higher than that of the bulk. These data can be explained by the enhancement in electric field inside the clusters due to the dielectric confinement effect. The size and wavelength dependences of this local field effect have been calculated for CdS clusters. Several trends in the nonresonant χ(3) can be identified: (i) In the absence of quantum confinement effect, the magnitude of χ(3) should be constant in the < 200 Å size regime. It then increases with increasing particle size until the structural resonance regime is reached. (ii) The magnitude of χ(3) can be enhanced by either lowering the refractive index of the surrounding medium or raising the refractive index of the semiconductors. (iii) Quantum confinement, which shifts the band gap to the blue and lowers the refractive index of the semiconductor clusters, reduces the nonresonant χ(3). This is in direct contrast to the resonant nonlinearity which is enhanced by the quantum-confinement effect. Finally, we discuss the size-dependent figure-of-merit of CdS composites for all-optical switching.

Graphene/Si-Quantum-Dot Heterojunction Diodes Showing High Photosensitivity Compatible with Quantum Confinement Effect

2015 ◽  
Vol 27 (16) ◽  
pp. 2614-2620 ◽  
Author(s):  
Dong Hee Shin ◽  
Sung Kim ◽  
Jong Min Kim ◽  
Chan Wook Jang ◽  
Ju Hwan Kim ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Si Quantum Dot ◽  
Heterojunction Diodes ◽  
High Photosensitivity

QUANTUM CONFINEMENT EFFECT IN HgTe NANOCRYSTALS AND VISIBLE LUMINESCENCE

2004 ◽  
Vol 03 (03) ◽  
pp. 393-401 ◽  
Author(s):  
S. RATH ◽  
A. K. DASH ◽  
S. N. SAHU ◽  
S. NOZAKI
Keyword(s):  
Valence Band ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Free Exciton ◽  
Confinement Effect ◽  
Electrochemical Technique ◽  
Cubic Phase ◽  
Exciton Transition ◽  
Mercury Telluride ◽  
Transmission Electron

Mercury Telluride ( HgTe ) nanocrystals with a mean size of 5.35 nm have been synthesized by an electrochemical technique. Structural analysis by transmission electron microscopy and glancing angle X-ray diffraction studies indicate the presence of cubic phase HgTe nanocrystals in the deposit. Optical absorption measurements reveal two well resolved excitonic peaks around 578.5 nm and 550 nm attributed to heavy hole valence band (HVB)–conduction band (CB) and light hole valence band (LVB)–CB transitions, respectively, and suggest a band opening of bulk inverted narrow band gap HgTe as a result of strong quantum confinement effect (QCE). Visible photoluminescence (PL) of HgTe nanocrystals indicates free exciton transition around 579.5 nm as observed from the PL measurement at 300 K along with a bound exciton dominated band around 588 nm. Micro-Raman measurements at 300 K indicate the 1LO vibrational mode at 142.6 cm-1 shifted by 6 cm-1 from its standard bulk value and confirm the QCE.

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