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Potential well
About: Potential well is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 30812 citations.
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TL;DR: In this article, ultrathin two-dimensional WS2 nanostructures with various morphologies have been prepared on SiO2/Si and sapphire substrates by vapor phase deposition method.
Abstract: Ultrathin two-dimensional WS2 nanostructures with various morphologies have been prepared on SiO2/Si (300 nm) and sapphire substrates by vapor phase deposition method. Simultaneously, tungsten nanostructures have also been obtained during the growth process. The nanostructures and morphologies of as-prepared products were systematically characterized by employing atomic force microscopy, Raman spectroscopy as well as scanning electron spectroscopy. The electrostatic properties of WS2 nanostructures were investigated exhibiting uniform surface potential and charge distributions. We have also detected the photoluminescence properties of WS2 nanostructures, which are dependent on the thickness and nanostructures of synthesized WS2. These results suggest that the optoelectronic properties of WS2 nanostructures can be effectively tuned by quantum confinement effect and nanostructures.
11 citations
TL;DR: In this paper, the photoluminescence of the coupled colloidal system of SiC QDs and Ag nanoparticles was studied and it was shown that there is a strong coupling between the localized electron-hole pair in the SiC quantum dot and the localized surface plasmon in the Ag nanoparticle.
Abstract: The quantum confinement effect is one of the crucial physical effects that discriminate a quantum material from its bulk material. It remains a mystery why the 6H-SiC quantum dots (QDs) do not exhibit an obvious quantum confinement effect. We study the photoluminescence of the coupled colloidal system of SiC QDs and Ag nanoparticles. The experimental result in conjunction with the theoretical calculation reveals that there is strong coupling between the localized electron-hole pair in the SiC QD and the localized surface plasmon in the Ag nanoparticle. It results in resonance energy transfer between them and resultant quenching of the blue surface-defect luminescence of the SiC QDs, leading to uncovering of a hidden near-UV emission band. This study shows that this emission band originates from the interband transition of the 6H-SiC QDs and it exhibits a remarkable quantum confinement effect.
11 citations
TL;DR: In this paper, the authors studied the optical properties of Si nanohills formed on the SiO2/Si interface by the pulsed Nd:YAG laser radiation and found a new method for graded band gap semiconductor formation using an elementary semiconductor.
Abstract: The aim of this work is to study optical properties of Si nanohills formed on the SiO2/Si interface by the pulsed Nd:YAG laser radiation. Nanohills which are self-organized on the surface of Si, are characterized by strong photoluminescence in the visible range of spectra with long wing in the red part of spectra. This peculiarity is explained by Quantum confinement effect in nanohillsnanowires with graded diameter. We have found a new method for graded band gap semiconductor formation using an elementary semiconductor. Graded change of band gap arises due to Quantum confinement effect.
11 citations
TL;DR: In this paper, density functional calculations were carried out to examine the vacancy-induced spin polarization in diamond, silicon, and germanium nanoparticles and the magnetic coupling between the vacancy induced defect states in those nanoparticles.
Abstract: Density functional calculations were carried out to examine the vacancy-induced spin polarization in diamond, silicon, and germanium nanoparticles and the magnetic coupling between the vacancy-induced defect states in those nanoparticles. Our calculations show that the vacancy-induced defect states are spin-polarized in diamond nanoparticles regardless of their size but this happens in silicon and germanium nanoparticles only when their size is small, which is in reasonable agreement with the experimentally observed magnetic behaviors. The vacancy-induced defect states on adjacent vacancies prefer to couple ferromagnetically in C nanoparticles but antiferromagnetically in Si and Ge nanoparticles.
11 citations
TL;DR: In this article, the weak quantum confinement effect in zinc oxide nanorods fabricated by a simple wet chemical method at room temperature was confirmed through X-ray diffraction measurements, and the particle size was also determined from the X ray diffraction pattern and was found to be 20 nm.
Abstract: We report here the weak quantum confinement effect in zinc oxide nanorods fabricated by a simple wet chemical method at room temperature. The formation of nanorods was confirmed through X-ray diffraction measurements. The particle size was also determined from the X-ray diffraction pattern and was found to be 20 nm. The band gap was calculated from the UV-Visible spectrum and found to be 3.72 eV, which is higher as compared to the bulk ZnO. It owes its value to the quantum confinement effect. However, the large particle size indicates that the confinement is weak in nature. The photoluminescence spectrum shows a strong emission peak at 421 nm accompanied by several much weaker defect related emissions in the visible region. Using the weak confinement model, we identified the transition levels for those emissions.
11 citations