Ab initio energy loss spectra of Si and Ge nanowires

2015 ◽  
Vol 17 (43) ◽  
pp. 29085-29089 ◽  
Author(s):  
Maurizia Palummo ◽  
Conor Hogan ◽  
Stefano Ossicini
Keyword(s):  
Energy Loss ◽  
Dielectric Response ◽  
Quantum Confinement ◽  
Blue Shift ◽  
Low Energy ◽  
Quantum Mechanical ◽  
Nanowire Diameter ◽  
Plasmon Peak ◽  
Quantum Confinement Effects ◽  
Volume Plasmon

By means of parameter-free quantum-mechanical dielectric response calculations of thin Si and Ge nanowires we explain the presence of the low energy peaks observed in EELS-TEM experiments and predict an important nanowire diameter dependence of the volume plasmon peak due to quantum-confinement effects, which is consistent with the blue shift observed experimentally in thicker wires.

Quantum size effects on the optical properties of nc-Si QDs embedded in an a-SiOx matrix synthesized by spontaneous plasma processing

2015 ◽  
Vol 17 (7) ◽  
pp. 5063-5071 ◽  
Author(s):  
Debajyoti Das ◽  
Arup Samanta
Keyword(s):  
Optical Properties ◽  
Size Effects ◽  
Quantum Confinement ◽  
Plasma Processing ◽  
Blue Shift ◽  
Quantum Size Effects ◽  
Confinement Effects ◽  
Quantum Size ◽  
Quantum Confinement Effects ◽  
Stokes Shifts

An energy blue shift due to quantum confinement effects in tiny nc-Si QDs accompanied by larger Stokes shifts in PL at smaller dimensions.

Prospects for Bismuth Nanowires as Thermoelectrics

1998 ◽  
Vol 545 ◽  
Author(s):  
M. S. Dresselhausa ◽  
Z. Zhang ◽  
X. Sun ◽  
J. Y. Ying ◽  
J. Heremans ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Electronic Band Structure ◽  
Electron Gas ◽  
Electronic Band ◽  
Nanowire Diameter ◽  
Crystalline Orientation ◽  
One Dimensional ◽  
Quantum Confinement Effects ◽  
High Anisotropy ◽  
Bismuth Nanowires

AbstractThe small effective mass of Bi, high anisotropy of its Fermi surface, and the high aspect ratio (length/diameter) of Bi nanowires make this an excellent system for studying quantum confinement effects of a one-dimensional (ID) electron gas in relation to electrical conductivity, thermoelectric power, and thermal conductivity. A theoretical model based on the basic electronic band structure of bulk Bi is suitably modified to describe 1D bismuth nanowires and is used to predict the dependence of these transport properties on nanowire diameter, temperature and crystalline orientation of the bismuth nanowires. Experiments have been carried out on ultra-fine single crystal Bi nanowires (10–120 nm diameter) with a packing density as high as 7 × 1010 wires/cm2 to test the quantum confinement assumptions of the model and the occurrence of a quantum confinement-induced semimetal-to-semiconductor transition as the wire diameter becomes less than 100 nm. Prospects for the use of bismuth nanowires for thermoelectric applications are discussed.

Optical Tunable Properties of Semiconductor Compound ZnxCd1-xS Incorporated in the Channels of Nanoporous VSB-5 Crystals

2007 ◽  
Vol 121-123 ◽  
pp. 929-932
Author(s):  
Dun Liang Jian ◽  
Qiu Ming Gao ◽  
Dong Mei Gao
Keyword(s):  
Metal Ions ◽  
Absorption Spectra ◽  
Quantum Confinement ◽  
Blue Shift ◽  
Confinement Effects ◽  
Santa Barbara ◽  
Semiconductor Compound ◽  
Quantum Confinement Effects ◽  
Spectra Properties ◽  
Tunable Property

ZnxCd1-xS (x = 0~1) nanoparticles were prepared in the channels of nanoporous VSB-5 (Versailles Santa Barbara-5) by introducing metal ions in the channels and followed by vulcanization. ZnxCd1-xS nanoparticles and VSB-n displayed their own spectra properties. However, ZnxCd1-xS nanoparticles demonstrate obvious blue-shift and tunable property in the UV-vis absorption spectra due to the quantum confinement effects.

Growth and Experimental Evidence of Quantum Confinement Effects in Cu2O and CuO Thin Films

2011 ◽  
Vol 15 ◽  
pp. 69-74 ◽  
Author(s):  
S.D. Pappas ◽  
Panagiotis Poulopoulos ◽  
Vassilios Kapaklis ◽  
S. Grammatikopoulos ◽  
D. Trachylis ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Energy Gap ◽  
Blue Shift ◽  
Ambient Air ◽  
Confinement Effects ◽  
Oxide Semiconductors ◽  
Cu Films ◽  
Corning Glass ◽  
Quantum Confinement Effects ◽  
Transmission Geometry

Thin Cu films of thickness 0.4 – 150 nm were deposited via radio frequency magnetron sputtering on Si(100) wafers, corning glass and quartz. Subsequently the Cu films were oxidized in ambient air at 230oC and 425oC in order to produce single-phase Cu2O and CuO, respectively. Selected samples were measured in the transmission geometry with the help of an ultraviolet – visible spectrophotometer. From the absorption spectra of the films, it was found that the gap EB for the dipole allowed transitions showed blue shifts of about 1.2 eV for the Cu2O thinnest film (0.75 nm), whereas the Edirect for the direct gap transitions showed blue shifts of about 0.16 eV for the CuO thinnest film (0.7 nm). The blue shift of the energy gap in the copper-oxide semiconductors is an indication of the presence of strong quantum confinement effects.

DIELECTRIC RESPONSE AND ENERGY LOSS FOR AN INTERMEDIATE QUANTUM PLASMA

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-513-C7-514
Author(s):  
N. E. Frankel ◽  
K. C. Hines ◽  
R. D.B. Speirs
Keyword(s):  
Energy Loss ◽  
Dielectric Response ◽  
Quantum Plasma

High-Performance and Low-Energy Loss Organic Solar Cells with Non-fused Ring Acceptor by Alkyl Chain Engineering

2021 ◽  
pp. 129768
Author(s):  
Dou Luo ◽  
Xue Lai ◽  
Nan Zheng ◽  
Chenghao Duan ◽  
Zhaojin Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Loss ◽  
Organic Solar Cells ◽  
High Performance ◽  
Alkyl Chain ◽  
Low Energy ◽  
Fused Ring

Realizing Stable High‐Performance and Low‐Energy‐Loss Ternary Photovoltaics through Judicious Selection of the Third Component

Solar RRL ◽  
2021 ◽  
pp. 2100450
Author(s):  
Bing-Huang Jiang ◽  
Yi-Peng Wang ◽  
Yu-Wei Su ◽  
Jia-Fu Chang ◽  
Chu-Chen Chueh ◽  
...  
Keyword(s):  
Energy Loss ◽  
High Performance ◽  
Low Energy ◽  
The Third ◽  
Selection Of

Anionic Fluorinated Zn-porphyrin Combined with Cationic Endohedral Li-fullerene for Long-Lived Photoinduced Charge Separation with Low Energy Loss

2021 ◽  
Vol 125 (3) ◽  
pp. 918-925
Author(s):  
Kazuhira Miwa ◽  
Shinobu Aoyagi ◽  
Takahiro Sasamori ◽  
Hiroshi Ueno ◽  
Hiroshi Okada ◽  
...  
Keyword(s):  
Energy Loss ◽  
Charge Separation ◽  
Low Energy ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge
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