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Showing 1 to 20 of 1194 for “"Semiconductors"”.
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Porosity in Nitride Semiconductors
… (ECE) can be used to create pores in nitride semiconductors in order to engineer their properties. ECE offers a simple, flexible approach to pore formation, driven by an electric field between the material surface and a suitable electrolyte. This means that the material must be conductive in …
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Theoretical studies on organic semiconductors
The thesis is concerned with the calculation o f carrierm obilities in organic molecular crystals.Five models which have been proposed to account for thetransport of charge carriers in such crystals are discussed andevaluated in the light of the most recent improvements in theestimates of transfer …
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Optical Transitions in Amorphous Semiconductors
In this thesis, a quantitative analysis of the optical response of an amorphous semiconductor is presented. The entire analysis is cast within the framework of an empirical model for the valence band and conduction band density of states functions, that captures the basic features expected of these …
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Spin Dynamics in Organic Semiconductors
Organic semiconductors exhibit exceptionally long spin lifetimes, and recent observations of the inverse spin hall effect as well as micrometer spin diffusion lengths in conjugated polymers have spiked interest in employing such carbon-based materials in spintronics applications. The charge …
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Ion Implantation Damage in Semiconductors
The diffuse X-ray scattering from defects in ion implanted Si was studied at implantation temperatures ranging from 100 K to 300 K, and the results were compared to simulations of the scattering intensity from realistic defects in Si. In situ studies of keV implants identified close Frenkel pair …
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Tunneling From Metal to Semiconductors
Made available in DSpace on 2015-05-12T17:12:32Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6303256.PDF: 1676433 bytes, checksum: bfec4fd95854de10bb91fa2b736828d0 (MD5) Previous issue date: 1962
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Photo-produced phonons in semiconductors
The techniques of phonon imaging are used in conjunction with photoluminescence measurements to determine the characteristics of optically generated phonon sources in Si, Ge and GaAs at 1.7K. Focused-laser excitation of a semiconductor generates phonons as a byproduct of electronic excitation. A …
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Vibrations in elemental amorphous semiconductors
… to structural models of the elemental amorphous semiconductors a-Ge, a-As and a-Se are presented. Simple dynamical models, involving restoring forces for bond length and angle variations only, provide information on the structure-dependence of the vibrational spectra and hence on the typical …
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Seebeck coefficient in organic semiconductors
… the role of energetic disorder in organic semiconductors. To this end, a microfabricated chip was designed to perform accurate measurements of the Seebeck coefficient within the channel of the active layer in a field-effect transistor (FET). When measured within an FET, the Seebeck …
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Spin Transport in Organic Semiconductors
… temperature solution processability of organic semiconductors have enabled many applications such as light emitting diodes, flexible logic and solar cells, they are unexploited in their potential for use in solid state devices for spintronics and spin-based information processing. Organic …
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Spin Currents in Organic Semiconductors
Organic semiconductors have recently been found to have a comparably large spin diffusion time and length. This makes them ideal candidates for spintronic devices. However, spin injection, transport and detection properties in organic materials have yet to be fully understood. This work studies …
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Inorganic semiconductors for printed transistors
CdSe nanoparticles have been solution deposited and thermally processed into thin film transistor channels, demonstrating for the first time that an inorganic semiconductor can be printed. A peak field effect mobility of 2.05 cm2V-1s-1 1 was observed for a device processed at 350 °C. The highest …
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Electron spin dynamics in semiconductors
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Topics in the Theory of Semiconductors: I. Novel Semiconductors. II. Uniaxial Stress Dependence of Deep Impurities
… the electronic energy band structures of novel semiconductors and chapter 4 deals with the uniaxial stress dependence of deep substitutional impurity levels in semiconductors.
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Topics in the theory of semiconductors: I. Novel semiconductors II. Uniaxial stress dependence of deep impurities
… the electronic energy band structures of novel semiconductors and chapter 4 deals with the uniaxial stress dependence of deep substitutional impurity levels in semiconductors. Chapter 1: The electronic energy band structure and deep substitutional impurity levels for metastable are predicted …
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Thiophene Based Semiconductors: Synthesis and Characterizations
… with the mobilities of the best organic semiconductors. All these significant differences in properties of related compounds can be attributed to the hydrogen bonding between QT-amide molecules responsible for the observed self-assembly.
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Chromophore-Matrix Interaction in Organic Semiconductors
Organische Halbleiter sind Moleküle und Polymere, welche durch die Konjugation ihres Elektronensystems Eigenschaften erhalten, die klassischen anorganischen Halbleitern ähnlich sind. Dadurch eignen sie sich zur Anwendung in Solarzellen, Leuchtdioden, Farbstoffen und Photokatalysatoren. Im Gegensatz …
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POLYMER ORGANIC SEMICONDUCTORS AND THEIR DEVICES
… thermal and ambient stability for this type of semiconductors was demonstrated. Degradation was only observed after 10 hours of light exposure in accelerated thermal stress. Lastly, to address current phase-separation problems in photovoltaic devices, a covalently linked, p-conjugated di-block …
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Liquid crystalline semiconductors for organic electronics
This research is based on the synthesis and evaluation of novel liquid crystalline materials with light-emitting and or charge-transporting properties. Some of the liquid crystals (LCs) synthesised incorporate photopolymerisable diene or methacrylate end groups, situated at the peripheries of the …
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