Browsing Center for Organic Photonics and Electronics (COPE) by Title
Now showing items 96-115 of 397
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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 ... -
Energetic Disorder and Carrier Transport in Photovoltaic Polymers
(2013-04-12)Solution processable polymeric solar cells have drawn a lot of attention due to their potential for low cost roll-to-roll manufacturing. Compared with inorganic semiconductors, polymer semiconductors have relatively low ... -
The energy computation paradox and ab initio protein folding
(Georgia Institute of TechnologyPublic Library of Science, 2011-04)The routine prediction of three-dimensional protein structure from sequence remains a challenge in computational biochemistry. It has been intuited that calculated energies from physics-based scoring functions are able to ... -
Enhanced carrier mobility and electrical stability of n-channel polymer thin film transistors by use of low-k dielectric buffer layer
(Georgia Institute of TechnologyAmerican Institute of Physics, 2011-10)Insertion of a low-k polymer dielectric layer between the SiO₂ gate dielectric and poly(benzobisimidazobenzophenanthroline) (BBL) semiconductor of n-channel transistors is found to increase the field-effect mobility of ... -
Enhanced hydrothermal conversion of surfactant-modified diatom microshells into barium titanate replicas
(Georgia Institute of TechnologyMaterials Research Society, 2007-05)The three-dimensional nanostructured SiO2-based microshells of diatoms have been converted into nanocrystalline BaTiO₃ via a series of shape-preserving reactions. The microshells, obtained as diatomaceous earth, were first ... -
Equivalent circuit model for organic single-layer diodes
(Georgia Institute of TechnologyAmerican Institute of Physics, 2008-09)A simple equivalent circuit is proposed to model single-layer organic diodes. The circuit is based on thermionic emission to describe carrier injection from the electrode into the organic semiconductor and on space-charge ... -
Evidence of large high frequency complete phononic band gaps in silicon phononic crystal plates
(Georgia Institute of TechnologyAmerican Institute of Physics, 2008-06-02)We show the evidence of the existence of large complete phononic band gaps (CPBGs) in two-dimensional phononic crystals (PCs) formed by embedding cylindrical air holes in a solid plate (slab). The PC structure is made by ... -
The Evolution Study Of Thin Film Structure During The Film Formation
(Georgia Institute of TechnologyAmerican Institute of Physics, 2010-01) -
Exciton dissociation and charge trapping at poly(3-hexylthiophene)/phenyl-C61-butyric acid methyl ester bulk heterojunction interfaces: Photo-induced threshold voltage shifts in organic field-effect transistors and solar cells
(Georgia Institute of TechnologyAmerican Institute of Physics, 2012-04)Photoinduced charge transfer at an electron donor/acceptor interface is one of the most crucial processes in determining the power conversion efficiency of organic solar cell devices. Here, we address exciton dissociation ... -
Experimental and theoretical study of temperature dependent exciton delocalization and relaxation in anthracene thin films
(Georgia Institute of TechnologyAmerican Institute of Physics, 2008-02)The spectroscopy of solid anthracene is examined both experimentally and theoretically. To avoid experimental complications such as self-absorption and polariton effects, ultrathin polycrystalline films deposited on ... -
Exploring the Synthesis and Applications of Graphene
(2015-05-04)Graphene is the ultimate two-dimensional material consisting of a single layer of sp hybridized carbon. Here we explore different approaches to synthesize this carbon allotrope, ranging from chemical conversion to vapor ...