Electrical and Optical Properties of Electrostatically Graded Band Gap Multifilms of Cadmium Sulfide and Indium Doped Cadmium Sulfide PDF Download
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Author: Paul Edward Sotak
Publisher:
ISBN:
Category : Cadmium sulfide
Languages : en
Pages : 218
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Author: Paul Edward Sotak
Publisher:
ISBN:
Category : Cadmium sulfide
Languages : en
Pages : 218
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Author: Johannes Frenzel
Publisher:
ISBN:
Category :
Languages : en
Pages : 123
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Author:
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ISBN:
Category :
Languages : en
Pages :
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In this work, the structural, electronic, and optical properties of CdS nanoparticles with sizes up to 4nm have been calculated using density-functional theory (DFT). Inaccuracies in the description of the unoccupied states of the applied density-functional based tight-binding method (DFTB) are overcome by a new SCF-DFTB method. Density-functional-based calculations employing linear-response theory have been performed on cadmium sulfide nanoparticles considering different stoichiometries, underlying crystal structures (zincblende, wurtzite, rocksalt), particle shapes (spherical, cuboctahedral, tetrahedral), and saturations (unsaturated, partly saturated, completely saturated). For saturated particles, the calculated onset excitations are strong excitonic. The quantum-confinement effect in the lowest excitation is visible as the excitation energy decreases towards the bulk band gap with increasing particle size. Dangling bonds at unsaturated surface atoms introduce trapped surface states which lie below the lowest excitations of the completely saturated particles. The molecular orbitals (MOs), that are participating in the excitonic excitations, show the shape of the angular momenta of a hydrogen atom (s, p). Zincblende- and wurtzite-derived particles show very similar spectra, whereas the spectra of rocksalt-derived particles are rather featureless. Particle shapes that confine the orbital wavefunctions strongly (tetrahedron) give rise to less pronounced spectra with lower oscillator strengths. Finally, a very good agreement of the calculated data to experimentally available spectra and excitation energies is found.
Author: Suman Lata Tripathi
Publisher: John Wiley & Sons
ISBN: 1119755085
Category : Technology & Engineering
Languages : en
Pages : 608
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The increasing demand for electronic devices for private and industrial purposes lead designers and researchers to explore new electronic devices and circuits that can perform several tasks efficiently with low IC area and low power consumption. In addition, the increasing demand for portable devices intensifies the call from industry to design sensor elements, an efficient storage cell, and large capacity memory elements. Several industry-related issues have also forced a redesign of basic electronic components for certain specific applications. The researchers, designers, and students working in the area of electronic devices, circuits, and materials sometimesneed standard examples with certain specifications. This breakthrough work presents this knowledge of standard electronic device and circuit design analysis, including advanced technologies and materials. This outstanding new volume presents the basic concepts and fundamentals behind devices, circuits, and systems. It is a valuable reference for the veteran engineer and a learning tool for the student, the practicing engineer, or an engineer from another field crossing over into electrical engineering. It is a must-have for any library.
Author: Simon Richard Stebbing
Publisher:
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Category :
Languages : en
Pages :
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Author: S.M. Barlow
Publisher:
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Category :
Languages : en
Pages :
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Author: Saraswathi Amma B
Publisher: LAP Lambert Academic Publishing
ISBN: 9783838362670
Category :
Languages : en
Pages : 124
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Semiconductor nanoparticles have drawn much attention due to their size dependent properties. Cadmium Sulphide (CdS), due to its large Bohr exciton diameter, has applications in various areas like optoelectronics, photo catalysis, biological assays, optical data storage and sensing. The optical properties of CdS nanoparticles capped with different capping agents, synthesized in aqueous and non-aqueous medium are presented in this monograph. As surface states have significant influence on the optical properties, surface passivation is important for improving Photoluminescence property apart from controlling the particle size. Stability and the optical properties of CdS - Polyvinyl Alcohol (PVA) nanocomposite films are dealt. The effects of electron irradiation and also, a Zinc Sulphide (ZnS) coating on the luminescence properties of CdS nanoparticles are also given. This monograph is specially targeted to researchers working in the field of semiconductor nanoparticles as well as postgraduate students of Physics, Chemistry, Electrical and Materials Engineering.
Author: Nick A. Komons
Publisher:
ISBN:
Category : Cadmium sulfide
Languages : en
Pages : 94
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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An historical account is given of ARL's program in Group II-VI compound semiconductors from the beginning of the program in 1951 to the present. Studies relating to the electrical and optical properties of cadmium sulfide are emphasized. The story is told in the changing context of Air Force research. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1074
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