Download or read book The Formation Structural and Optical Properties of Silicon Nanocrystals Embedded in Silicon Dioxide written by Wai Woon Yeong and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Formation Structural and Optical Properties of Silicon Nanocrystals Embedded in Silicon Dioxide written by Wai Woon Yeong and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Formation Structural and Optical Properties of Silicon Nanocrystals Embedded in Silicon Dioxide written by Yussof Wahab and published by . This book was released on 2008 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Nanocrystals in Various Dielectric Matrices Structural and Optical Properties written by Anastasiya Zelenina and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Zusammenfassung: AbstractThis dissertation is focused on the fundamental investigation of Si nanocrystals formed in annealed Si rich/stoichiometric dielectric multilayered structures. The films are prepared by size-controlled superlattices approach previously widely applied to SiOx/SiO2 superlattices. While a deep understanding of fundamental properties of Si nanocrystals in SiOx matrix has been already achieved, most of the results published on silicon nanocrystals in SiNx do not represent a clear understanding and sometimes even contradict to each other.Thereby, a starting point of the present research is a detailed study of Si nanocrystals embedded in Si nitride matrix. A careful development of plasma-enhanced chemical vapor deposition parameters allowed the deposition of optimized SiNx/Si3N4 superlattices of various SiNx thicknesses, which were further annealed in order to form Si nanocrystals of various sizes. Based on transmission electron microscopy and X-ray diffraction analysis, the formation of size-controlled Si nanocrystals of various sizes is confirmed. Despite photoluminescence spectra of these samples demonstrate the expected PL blue shift with the decrease of Si nanocrystal size, the shift is confirmed to be an optical artifact. The results presented here can explain a disagreement of the recent reports published on Si nanocrystals in SiNx matrix by other groups, as the photoluminescence peak shift is sometimes wrongly interpreted as nanocrystal size effect. Additionally, according to the concluded issues, novel hetero-combinations, which contain both silicon nitride and silicon oxide sublayers are proposed and realized. Although SiNx/SiO2 and SiOxNy/Si3N4 hetero-structures might show some benefits in optical and electrical properties compared to the standard SiOx/SiO2 and SiNx/Si3N4 superlattices, they have been only very barely studied previously. In the present work it is shown that high-temperature annealing leads to the destruction of SiNx/SiO2 hetero-superlattice, and Si nanocrystals of uncontrollable sizes irregularly distributed within the film are formed. At the same time SiOxNy/Si3N4 hetero-structure sustains high-temperature annealing and size-controlled Si nanocrystals demonstrate quantum luminescence
Download or read book Silicon Nanocrystals written by Lorenzo Pavesi and published by John Wiley & Sons. This book was released on 2010-02-02 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique collection of knowledge represents a comprehensive treatment of the fundamental and practical consequences of size reduction in silicon crystals. This clearly structured reference introduces readers to the optical, electrical and thermal properties of silicon nanocrystals that arise from their greatly reduced dimensions. It covers their synthesis and characterization from both chemical and physical viewpoints, including ion implantation, colloidal synthesis and vapor deposition methods. A major part of the text is devoted to applications in microelectronics as well as photonics and nanobiotechnology, making this of great interest to the high-tech industry.
Download or read book Structural and Optical Properties of Porous Silicon Nanostructures written by G Amato and published by CRC Press. This book was released on 1998-02-25 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a comprehensive review of the experimental and theoretical aspects of the optical and transport properties of nanoporous silicon, their relation to the microscopic structure of nanocrystals, and the application of porous silicon in optical devices. As porous silicon is an ideal substance for the modelling of optical processes in nanocrystalline materials, this volume also is an excellent reference source on the more general subject of the structural and optical properties of nanocrystalline semiconductors.
Download or read book SILICON NANOCRYSTALS EMBEDDED IN SiO2 FOR LIGHT EMITTING DIODE LED APPLICATIONS written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, silicon nanocrystals (NC) were synthesized in silicon dioxide matrix by ion implantation followed by high temperature annealing. Annealing temperature and duration were varied to study their effect on the nanocrystal formation and optical properties. Implantation of silicon ions was performed with different energy and dose depending on the oxide thickness on the silicon substrate. Before device fabrication, photoluminescence (PL) measurement was performed for each sample. From PL measurement it was observed that, PL emission depends on nanocrystal size determined by the parameters of implantation and annealing process. The peak position of PL emission was found to shifts toward higher wavelength when the dose of implanted Si increased. Two PL emission bands were observed in most cases. PL emission around 800 nm originated from Si NC in oxide matrix. Other emissions can be attributed to the luminescent defects in oxide or oxide/NC interface. In order to see electroluminescence properties Light Emitting Devices (LED) were fabricated by using metal oxide semiconductor structure, current-voltage (I-V) and electroluminescence (EL) measurements were conducted. I-V results revealed that, current passing through device depends on both implanted Si dose and annealing parameters. Current increases with increasing dose as one might expect due to the increased amount of defects in the matrix. The current however decreases with increasing annealing temperature and duration, which imply that, NC in oxide behave like a well controlled trap level for charge transport. From EL measurements, few differences were observed between EL and PL results. These differences can be attributed to the different excitation and emission mechanisms in PL and EL process. Upon comparision, EL emission was found to be inefficient due to the asymmetric charge injection from substrate and top contact. Peak position of EL emission was blue shifted with respect to PL one, and approached tow.
Download or read book Structural and Optical Properties of PECVD Grown Silicon Nanocrystals Embedded in SiOxNy Matrix written by Andreas Markus Hartel and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanosilicon written by Anatoly A. Ischenko and published by CRC Press. This book was released on 2014-07-23 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanosilicon: Properties, Synthesis, Applications, Methods of Analysis and Control examines the latest developments on the physics and chemistry of nanosilicon. The book focuses on methods for producing nanosilicon, its electronic and optical properties, research methods to characterize its spectral and structural properties, and its possible applic
Download or read book Silicon Nanocrystals written by Rishikesh Krishnan and published by . This book was released on 2005 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical and Electrical Properties of Silicon Nanocrystals Embedded in Silicon Rich Nitride Structures written by Joseph Warga and published by . This book was released on 2009 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Nitride Silicon Dioxide Thin Insulating Films and Other Emerging Diele c trics VIII written by Ram Ekwal Sah and published by The Electrochemical Society. This book was released on 2005 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Luminescent Properties of Silicon Nanocrystals written by Antonio Coyopol-Solis and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, study of silicon-based visible light-emitting devices has increased due to large-scale microelectronic integration. Since then different physical and chemical processes have been performed to convert bulk silicon (Si) into a light-emitting material. From discovery of Photoluminescence (PL) in porous Silicon by Canham, a new field of research was opened in optical properties of the Si nanocrystals (Si-NCs) embedded in a dielectric matrix, such as SRO (silicon-rich oxide) and SRN (silicon-rich nitride). In this respect, SRO films obtained by sputtering technique have proved to be an option for light-emitting capacitors (LECs). For the synthesis of SRO films, growth parameters should be considered; Si-excess, growth temperature and annealing temperature. Such parameters affect generation of radiative defects, distribution of Si-NCs and luminescent properties. In this chapter, we report synthesis, structural and luminescent properties of SRO monolayers and SRO/SiO2 multilayers (MLs) obtained by sputtering technique modifying Si-excess, thickness and thermal treatments.
Download or read book Optical Properties of Semiconductor Nanocrystals written by S. V. Gaponenko and published by Cambridge University Press. This book was released on 1998-10-28 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the optical properties of low-dimensional semiconductor structures, a hot research area - for graduate students and researchers.
Download or read book Electronic and Optical Properties of Silicon Nanocrystals written by Fabio Trani and published by LAP Lambert Academic Publishing. This book was released on 2015-02-18 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Even if the discovery of the photoluminescence of porous silicon dates to more than twenty years ago, the research on the optical properties of silicon is still a hot topic. The most recent experimental techniques have allowed the successful synthesis of silicon nanoparticles with narrow size distributions, and the realization of light-emitting silicon devices for technological and biomedical applications. From the theoretical point of view, the physics of silicon nanocrystals still deserves a huge interest. While the quantum confinement effect has been recognized as the main cause of the photoluminescence, many doubts remain on the way in which the phenomenon takes place in real nanocrystals. This book summarizes the result of a work lead by the author at the University of Naples. The density of states, the optical gap, the absorption spectra, the static dielectric constant, the recombination times, are all illustrated for several sets of silicon spheres and ellipsoids, upon changing their size and aspect ratio. The book also reviews previous research work, with special reference to the experimental and theoretical literature on silicon nanocrystals.
Download or read book Cathodoluminescence written by Naoki Yamamoto and published by BoD – Books on Demand. This book was released on 2012-03-28 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cathodoluminescence (CL) is a non-destructive technique to characterize optical and electronic properties of nanostructures in many kinds of materials. Major subject is to investigate basic parameters in semiconductors, impurities in oxides and phase determination of minerals. CL gives information on carrier concentration, diffusion length and life time of minority carriers in semiconductors, and impurity concentration and phase composition in composite materials. This book involves 13 chapters to present the basics in the CL technique and applications to particles, thin films and nanostructures in semiconductors, oxides and minerals. The chapters covered in this book include recent development of CL technique and applications to wide range of materials used in modern material science.
Download or read book Structural and Optical Properties of Nanocrystalline Silicon Thin Films Grown by 150MHz VHF PECVD written by Nurul Aini Tarjudin and published by . This book was released on 2012 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
