Browsing Center for Organic Photonics and Electronics (COPE) by Title
Now showing items 86-105 of 397
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Effect of an external electric field on the charge transport parameters in organic molecular semiconductors
(Georgia Institute of TechnologyAmerican Institute of Physics, 2003-12)Internal reorganization energies and interchain transfer integrals are two key parameters governing the charge-transport properties of organic semiconducting materials. Here, in order to model some aspects of device operation ... -
Effect of phosphonic acid surface modifiers on the work function of indium tin oxide and on the charge injection barrier into organic single-layer diodes
(Georgia Institute of TechnologyAmerican Institute of Physics, 2009)We investigate the use of several phosphonic acid surface modifiers in order to increase the indium tin oxide (ITO) work function in the range of 4.90–5.40 eV. Single-layer diodes consisting of ITO/modifier/N,N′-diphenyl ... -
Effect of Stress Due to Plastic Package Moisture Absorption in Hall Sensors
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-06)Commercial magnetic sensors based on the Hall effect are usually encapsulated in non-hermetic plastic packages. These plastic packages are known to swell in high humidity conditions due to moisture absorption. This swelling ... -
Effective conjugation and Raman intensities in oligo(para-phenylene)s: A microscopic view from first-principles calculations
(Georgia Institute of TechnologyAmerican Institute of Physics, 2005-03)Electron-phonon coupling in oligo(para-phenylene)s is addressed in terms of the off-resonance Raman intensities of two distinct modes at 1220 and 1280 cm−1. On the basis of Albrecht’s theory, vibrational coupling and Raman ... -
Effective impedance model for analysis of reflection at the interfaces of photonic crystals
(Georgia Institute of TechnologyOptical Society of America, 2007-04)We present an alternative definition of impedance to describe the reflection at the interfaces of photonic crystals. We show that this effective impedance can be defined only by the properties of the photonic crystal modes ... -
Effects of composition and phonon scattering mechanisms on thermal transport in MFI zeolite films
(Georgia Institute of TechnologyAmerican Institute of Physics, 2007-09)We report a systematic study that reveals the effect of composition (silicon-to-aluminum ratio) and the role of different phonon scattering processes on thermal transport in the nanoporous zeolite MFI. This is accomplished ... -
Effects of nonframework metal cations and phonon scattering mechanisms on the thermal transport properties of polycrystalline zeolite LTA films
(Georgia Institute of TechnologyAmerican Institute of Physics, 2010-03)We present a systematic study to investigate the effects of nonframework cations and the role of phonon scattering mechanisms on the thermal transport properties of zeolite LTA, via experiment and semiempirical lattice ... -
Effects of photoacid generator incorporation into the polymer main chain on 193 nm chemically amplified resist behavior and lithographic performance
(Georgia Institute of TechnologyAmerican Vacuum Society, 2007-11)The need for chemically amplified resists (CARs) that can resolve sub-65-nm node features with sufficient linewidth roughness (LWR) control and sensitivity to meet the requirements outlined in the International ... -
Efficient all-polymer solar cells based on blend of tris(thienylenevinylene)-substituted polythiophene and poly[perylene diimide-alt-bis(dithienothiophene)]
(Georgia Institute of TechnologyAmerican Institute of Physics, 2008-08-18)A narrow band-gap alternating copolymer of perylene diimide and bis(dithienothiophene) (2) and a polythiophene derivative substituted by a tris(thienylenevinylene) conjugated side chain (4) are used as acceptor and donor, ... -
Efficient Polymer Solar Cells
(Georgia Institute of Technology, 2013-01-25)The power conversion efficiency of organic solar cells depends on the quantum and energy efficiency by which photons from the sun are converted into electrical power. Absorption of light, charge generation, transport and ... -
Efficient thin-film organic solar cells based on pentacene/C-60 heterojunctions
(Georgia Institute of TechnologyAmerican Institute of Physics, 2004-11)We have fabricated an efficient organic photovoltaic cell based on a heterojunction of pentacene and C ₆₀. Photocurrent action spectra exhibit broad light-harvesting throughout the visible spectrum with a peak external ... -
Electrodeposition of mixed adherent thin films of poly(ethyl acrylate) and polyacrylonitrile onto nickel
(Georgia Institute of TechnologyEuropean Polymer Federation, 2004-10)Adherent thin polymer films have been prepared by sequential electro-deposition of ethyl acrylate (EA) and acrylonitrile (AN) onto nickel. Their compo-sition has been studied by IR spectroscopy and time of flight - secondary ... -
Electron beam lithography process using radiation sensitive carboxylate metalorganic precursors
(Georgia Institute of TechnologyAmerican Vacuum Society, 2003-11)A bilayer process has been developed for electron beam lithography using radiation sensitive metalorganic precursors as imaging layers in conjunction with organic planarizing layers. Upon electron beam irradiation, the ... -
Electronic and optical properties of polyfluorene and fluorene-based copolymers: A quantum-chemical characterization
(Georgia Institute of TechnologyAmerican Institute of Physics, 2003-04)We report a detailed quantum-chemical characterization of the electronic and optical properties of polyfluorene chains and compare them to those in copolymers containing alternating fluorene and benzothiadiazole or ... -
Electronic and vibrational properties of nickel sulfides from first principles
(Georgia Institute of TechnologyAmerican Institute of Physics, 2007-12)We report the results of first-principles calculations (generalized gradient approximation–Perdew Wang 1991) on the electronic and vibrational properties of several nickel sulfides that are observed on Ni-based anodes in ... -
Electronic and vibronic interactions at weakly bound organic interfaces: The case of pentacene on graphite
(Georgia Institute of TechnologyAmerican Physical Society, 2008-07)The electronic and vibronic processes at the interface between a pentacene monolayer and a graphite surface were characterized using a combination of density-functional theory (DFT) and dynamic vibronic coupling simulations. ... -
Electronic Processes and Phenomena in Organic Materials: A Materials Scientist’s Point of View
(Georgia Institute of Technology, 2013-07-12)In the past decade, significant progress has been made in the fabrication of organic semiconductor thin-film devices predominantly due to important improvements of existing materials and the creation of a wealth of novel ... -
Electronic properties of silole-based organic semiconductors
(Georgia Institute of TechnologyAmerican Institute of Physics, 2004-11)We report on a detailed quantum-chemical study of the geometric structure and electronic properties of 2,5-bis(6′-(2′,2″-bipyridyl))-1,1-dimethyl-3,4-diphenylsilole (PyPySPyPy) and 2,5-di- (3-biphenyl)-1,1-dimethyl-3,4-d ... -
The electronic structure of oxo-Mn(salen): Single-reference and multireference approaches
(Georgia Institute of TechnologyAmerican Institute of Physics, 2006-04)Using single- and multireference approaches we have examined many of the low-lying electronic states of oxo-Mn(salen), several of which have not been explored previously. Large complete-active-space self-consistent-field ... -
Encapsulation of pentacene/C₆₀ organic solar cells with Al₂O₃ deposited by atomic layer deposition
(Georgia Institute of TechnologyAmerican Institute of Physics, 2007-06)Organic solar cells based on pentacene/C₆₀ heterojunctions were encapsulated using a 200-nm-thick film of Al₂O₃ deposited by atomic layer deposition (ALD). Encapsulated devices maintained power conversion efficiency after ...