Observation of the quantum-confinement effect in individual Ge nanocrystals on oxidized Si substrates using scanning tunneling spectroscopy

2005 ◽  
Vol 87 (13) ◽  
pp. 133119 ◽  
Author(s):  
Yoshiaki Nakamura ◽  
Kentaro Watanabe ◽  
Yo Fukuzawa ◽  
Masakazu Ichikawa
Keyword(s):  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Confinement Effect ◽  
Scanning Tunneling ◽  
Si Substrates ◽  
Ge Nanocrystals

scholarly journals Ионный синтез кристаллической фазы Ge в пленках SiO-=SUB=-x-=/SUB=-N-=SUB=-y-=/SUB=- при отжиге под высоким давлением

2018 ◽  
Vol 52 (2) ◽  
pp. 280
Author(s):  
И.Е. Тысченко ◽  
Г.К. Кривякин ◽  
В.А. Володин
Keyword(s):  
Raman Scattering ◽  
Raman Spectra ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Hydrostatic Compression ◽  
Confinement Effect ◽  
Optical Phonons ◽  
Photoluminescence Spectra ◽  
Ge Nanocrystals

AbstractThe nucleation of the crystalline Ge phase in SiO_ x N_ y films implanted with Ge^+ ions with the energy 55 keV to doses of 2.1 × 10^15–1.7 × 10^16 cm^–2 and then annealed at a temperature of T _a = 800–1300°C under pressures of 1 bar and 1–12 kbar is studied. From analysis of the Raman spectra, it is concluded that amorphous Ge precipitates increase in size upon hydrostatic compression at a temperature of 1000°C. Raman scattering at optical phonons localized in Ge nanocrystals is observed only after annealing of the samples with the highest content of implanted atoms at a temperature of 1300°C. In the photoluminescence spectra, a peak is observed at the wavelength ∼730 nm. The peak is considered to be the manifestation of the quantum-confinement effect in nanocrystals ∼3 nm in size.

Direct Evaluation of the Quantum Confinement Effect in Single Isolated Ge Nanocrystals

2015 ◽  
Vol 6 (17) ◽  
pp. 3396-3402 ◽  
Author(s):  
Oded Millo ◽  
Isacc Balberg ◽  
Doron Azulay ◽  
Tapas K. Purkait ◽  
Anindya K. Swarnakar ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Direct Evaluation ◽  
Ge Nanocrystals

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

Scanning-tunneling spectroscopy on conjugated polymer films

2003 ◽  
Vol 771 ◽  
Author(s):  
M. Kemerink ◽  
S.F. Alvarado ◽  
P.M. Koenraad ◽  
R.A.J. Janssen ◽  
H.W.M. Salemink ◽  
...  
Keyword(s):  
Polymer Films ◽  
Conjugated Polymer ◽  
Three Dimensional ◽  
Field Enhancement ◽  
Direct Consequence ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Band Alignment ◽  
Scanning Tunneling ◽  
Order Of Magnitude

AbstractScanning-tunneling spectroscopy experiments have been performed on conjugated polymer films and have been compared to a three-dimensional numerical model for charge injection and transport. It is found that field enhancement near the tip apex leads to significant changes in the injected current, which can amount to more than an order of magnitude, and can even change the polarity of the dominant charge carrier. As a direct consequence, the single-particle band gap and band alignment of the organic material can be directly obtained from tip height-voltage (z-V) curves, provided that the tip has a sufficiently sharp apex.

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