* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download T. Dammak - TU-MRS
Survey
Document related concepts
Energy applications of nanotechnology wikipedia , lookup
Optical tweezers wikipedia , lookup
Nitrogen-vacancy center wikipedia , lookup
X-ray crystallography wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Density of states wikipedia , lookup
History of metamaterials wikipedia , lookup
Quantum tunnelling wikipedia , lookup
Heat transfer physics wikipedia , lookup
Colloidal crystal wikipedia , lookup
Condensed matter physics wikipedia , lookup
Transcript
CA1-56 Elaboration, vibrational and photoluminescence studies on a new self-organized quantum well crystal (C4H16N3)CuCl5 T. Dammak and Y. Abid Laboratoire de Physique appliquée, Faculté des Sciences de Sfax, Université de Sfax, B. P. 1171, 3000 Sfax, Tunisia During the last two decades, low-dimensional semiconductor structures have been investigated from the viewpoint of fundamental physics and of applications in novel optical and electrical devices. Especially, numerous studies have shown the unique optical properties of semiconductor multiple quantum well structures, in which Coulomb interaction between electrons and holes is enhanced by electronic confinement and dielectric confinement effects. The latter is due to the difference between the dielectric constant of the quantum wells and the barrier layers. It is thought to increase the binding energy of excitons. More recently, the hybrid organic inorganic layered perovskite, with general formula (RNH3)2MX4 (R; CnH2n+1, X; halogen) were extensively studied for their electrical and optical properties. We have prepared new semiconductor (C4H16N3)CuCl5 crystals which are self-assembled organic–inorganic hybrid materials. The grown crystals have been studied by X-ray diffraction, infrared absorption and Raman scattering. We found that the title compound, abbreviated 2C6PbBr4, crystallises in a two-dimensional structure with a P21/a space group. In the inorganic semiconductor sub-lattice, the corner sharing CuCl6 octahedra form infinite 2D chains. The organic C4H16N3+ ions form the insulator barriers between the inorganic semiconductor layers. Such a packing leads to a self-assembled multiple quantum well structure. Transmission measurements on thin films of this material obtained by the spin coating method and it showed characteristic absorptions of CuCl-based layered perovskite centered at 300 and 380 nm, as well as the photoluminescence peak at around 420 nm associated with radiative recombinations of excitons confined within the CuCl6 layers. The electron-hole binding energy is estimated at 300 meV. Matériaux 2015