Book ChapterDOI
Optical Spectroscopy of Size Effects in Semiconductor Microcrystals
A. I. Ekimov,Al. L. Efros +1 more
- pp 199-207
Reads0
Chats0
TLDR
In this paper, the quantum confinement effects in semiconductor microcrystals grown in an optically transparent matrix of oxide glass were investigated, and it was shown that it is possible to vary the size of micro-crystals in a controlled manner from a few tens to thousands of angstroms.Abstract:
Size effects in semiconductor systems with reduced dimensions have attracted considerable attention within the last few years. Besides the well known quantum-well and quantum-wire structures(1,2), semiconductor microcrystals prepared in aqueous and gaseous media were investigated(3,4). The purpose of this paper is to investigate the quantum confinement effects in semiconductor microcrystals grown in an optically transparent matrix of oxide glass. The preparation technique developed makes it possible to vary the size of microcrystals in a controlled manner from a few tens to thousands of angstroms(5).read more
Citations
More filters
Journal ArticleDOI
Optical spectroscopy of opal matrices with CdS embedded in its pores: Quantum confinement and photonic band gap effects
Vasily N. Astratov,V. N. Bogomolov,A. A. Kaplyanskii,A. V. Prokofiev,L. A. Samoilovich,S. M. Samoilovich,Yu. A. Vlasov +6 more
TL;DR: In this article, it was shown that opal behaves as a semi-metallic photonic band gap material in the vicinity of photon energy 2.3 eV, which makes opal/semiconductor system a promising media for experimental studies of such PBG-related effects as inhibition of spontaneous emission, microcavity polariton, etc.
Journal ArticleDOI
Wavelength-shifting properties of luminescence nanoparticles for high energy particle detection and specific physics process observation
TL;DR: Developing of UV-enhanced photosensors using wavelength-shifting properties of nanoparticles is reported on, indicating that ZnS:Mn,Eu, Zn S:Mm, Cu-Cy, CdTe and LaF3:Ce nanoparticles show potential for light detection from fundamental particle interactions.
Journal ArticleDOI
Room Temperature Excitonic Absorption in Small Cds Crystallites
D.K. Rai,Binod Kumar +1 more
Abstract: The absorption characteristics of commercial CdS-containing yellow glass which shows constant transmitted intensity over a range of incident CW laser intensity have been studied at room temperature. Although the thick specimen (t>0.6 mm) shows only a broad step-like feature near λ>460 nm, a thin (t-0.09 mm) specimen shows two absorption features which can be interpreted as the first two quantum-confined exciton absorption features corresponding to a crystallite size of -45 A. The absorption spectrum of a sample (t∼O.6 mm) heated for 15 min. at 700°C shows two new absorption features at 450 nm and 380 nm, which correspond to a much smaller crystallite size of -25 A. This reduction in size is not inconsistent with estimates made from a well-known model for crystallite growth. Some consequences of these changes in the absorption features on the optical nonlinearities of the glass will be discussed.
Journal ArticleDOI
New Conjugates Based on AIS/ZnS Quantum Dots and Aluminum Phthalocyanine Photosensitizer: Synthesis, Properties and Some Perspectives
Dmitry Yakovlev,E. P. Kolesova,Svetlana V. Sizova,K. I. Annas,M V Tretyak,Victor B. Loschenov,Anna O. Orlova,Vladimir Oleinikov +7 more
TL;DR: In this article , the authors conjugated PS with AIS/ZnS triple quantum dots (QDs) to obtain nonaggregated complexes and showed that the conjugation of PS with QDs does not change the PS fluorescence lifetime, which is a marker of the preservation of PS photophysical properties.
References
More filters
Journal ArticleDOI
A simple model for the ionization potential, electron affinity, and aqueous redox potentials of small semiconductor crystallites
TL;DR: In this article, the photochemical redox potential of one carrier, as a function of the size of the crystal, has been studied in the case of a small number of electrons.
A simple model for the ionization potential, electron affinity, and aqueous redox potentials of small semiconductor crystallites
Abstract: Large semiconductor crystals have intrinsic electronic properties dependent upon the bulk band structure. As the crystal becomes small, a new regime is entered in which the electronic properties (excited states, ionization potential, electron affinity) should be strongly dependent upon the electron and hole in a confined space. We address the possibility of a shift in the photochemical redox potential of one carrier, as a function of crystallite size. As a semiquantitative guide, one might expect a shift on the order of h2/8em*R2 due to the kinetic energy of localization in the small crystallite. We model the elementary quantum mechanics of a charged crystallite using (a) the effective mass approximation, (b) an electrostatic potential for dielectric polarization, and (c) penetration of the carrier outside the crystallite in a cases of small effective mass. Shifts of several tenths of an eV appear possible in crystallites of diameter 50 A. The carrier charge density reside near the crystallite surface if ...
Journal ArticleDOI
Quantum size effect in semiconductor microcrystals
TL;DR: In this paper, a growth technique of the semiconductor microcrystals in a glassy dielectric matrix has been developed, which permits to vary the size of the grown microcrystal in a controlled manner from some tens to thousands of angstroms.
Journal ArticleDOI
Compositional and doping superlattices in III-V semiconductors
TL;DR: The unusual electrical and optical properties of three important types of semiconductor superlattices are reviewed in this article, where the electronic energy bands in these structures are split into quasi-two-dimensional subbands whose spacing and width can be tailored by appropriate choice of the design parameters of the structure.
Journal ArticleDOI
One and two-dimensional quantum localization in GaAs wires of rectangular cross-sections
TL;DR: In this article, the authors measured the thermal behavior of three GaAs wires (thickness: 0.32 μm, widths: 0,8, 2,4 and 5.4 μm) produced by lithographic techniques.
Related Papers (5)
Chapter 1 - Theoretical Bases of the Optical Properties of Semiconductor Quantum Nano-Structures
Confinement effects and tunability of quantum dots within strong confinement regime
Sadia Sultana,Md. Shah Alam +1 more
Comparison of quantum confinement effects between quantum wires and dots
Jingbo Li,Lin-Wang Wang +1 more