Browsing Center for Organic Photonics and Electronics (COPE) by Title
Now showing items 156-175 of 397
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An idealized model for nonequilibrium dynamics in molecular systems
(Georgia Institute of TechnologyAmerican Institute of Physics, 2005-10)The nonequilibrium dynamics of highly nonlinear and multidimensional systems can give rise to emergent chemical behavior which can often be tracked using low-dimensional order parameters such as a reaction path. Such ... -
Identifying reactive trajectories using a moving transition state
(Georgia Institute of TechnologyAmerican Institute of Physics, 2006-06)A time-dependent no-recrossing dividing surface is shown to lead to a new criterion for identifying reactive trajectories well before they are evolved to infinite time. Numerical dynamics simulations of a dissipative ... -
Impact of bidirectional charge transfer and molecular distortions on the electronic structure of a metal-organic interface
(Georgia Institute of TechnologyAmerican Physical Society, 2007-12)Interface energetics are of fundamental importance in organic and molecular electronics. By combining complementary experimental techniques and first-principles calculations, we resolve the complex interplay among several ... -
An improved dynamic Monte Carlo model coupled with Poisson equation to simulate the performance of organic photovoltaic devices
(Georgia Institute of TechnologyAmerican Institute of Physics, 2011-03)We describe a new dynamic Monte Carlo model to simulate the operation of a polymer-blend solar cell; this model provides major improvements with respect to the one we developed earlier [J. Phys. Chem. B 114, 36 (2010)] by ... -
Improved method for measuring photoacid generator kinetics in polymer thin films using normalized interdigitated electrode capacitance data
(Georgia Institute of TechnologyAmerican Vacuum Society, 2004-05)A data analysis method is presented that can be used to calculate kinetic rate constants for photoacid generation (Dill C values) in polymer and chemically amplified photoresist thin films using capacitance versus exposure ... -
Improvement of the coupled-cluster singles and doubles method via scaling same- and opposite-spin components of the double excitation correlation energy
(Georgia Institute of TechnologyAmerican Institute of Physics, 2008-03-28)There has been much interest in cost-free improvements to second-order Moller-Plesset perturbation theory (MP2) via scaling the same- and opposite-spin components of the correlation energy (spin-component scaled MP2). By ... -
Improvement of thermal properties of ultra-high Q silicon microdisk resonators
(Georgia Institute of TechnologyOptical Society of America, 2007-12)We present a detailed study of the thermal properties of ultra-high quality factor (Q) microdisk resonators on silicon-on-insulator (SOI) platforms. We show that by preserving the buried oxide layer underneath the Si ... -
In Situ Acoustic Temperature Measurement During Variable-Frequency Microwave Curing
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2008-10)Variable-frequency microwave (VFM) curing can perform the same processing steps as conventional thermal processing in minutes, without compromising intrinsic material properties. With increasing demand for novel dielectrics, ... -
Incongruent reduction of tungsten carbide by a zirconium-copper melt
(Georgia Institute of TechnologyMaterials Research Society, 2003-09)The reduction of tungsten carbide (WC) to elemental tungsten by reaction with a Zr-Cu melt was examined. Dense WC disks were immersed in a vertical orientation in molten Zr₂Cu at 1150-1400 °C for 1.5-24 h. Continuous, ... -
Incorporation of cobaltocene as an n-dopant in organic molecular films
(Georgia Institute of TechnologyAmerican Institute of Physics, 2007-07-01)Electrical or chemical doping of molecular films is an efficient means of improving and controlling charge injection and carrier transport in organic devices. Recent work demonstrated that bis(cyclopentadienyl)cobalt(II) ... -
Indium tin oxide-free and metal-free semitransparent organic solar cells
(Georgia Institute of TechnologyAmerican Institute of Physics, 2010-10)We report on indium tin oxide (ITO)-free and metal-free semitransparent organic solar cells with a high-conductivity poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) (PH1000) as both the bottom and the ... -
Induced-dipole-electric-field contribution of atomic chains and atomic planes to the refractive index and birefringence of nanoscale crystalline dielectrics
(Georgia Institute of TechnologyOptical Society of America, 2007-09)The induced-dipole-electric-field contribution to the refractive index at any location within a nanometer-scale dielectric is quantified by summing the electronic dipole contributions due to all the surrounding atoms in ... -
Influence of solubility switching mechanism on resist performance in molecular glass resists
(Georgia Institute of TechnologyAmerican Vacuum Society, 2007-11)Five different molecular glass chemically amplified photoresists which utilized different solubility switching mechanisms and chemistries, based on a tris(4-hydroxyphenyl)ethane (THPE) core, were synthesized and their ... -
Integrated organic photovoltaic modules with a scalable voltage output
(Georgia Institute of TechnologyAmerican Institute of Physics, 2006-12)Efficient organic photovoltaic modules and cells have been fabricated based on a blend of poly(3-hexylthiophene) (P3HT) and a soluble C₇ ₀ derivative, [6,6]-phenyl C₇ ₁ butyric acid methyl ester (PCBM-70). Power conversion ... -
Intensity-dependent equivalent circuit parameters of organic solar cells based on pentacene and C-60
(Georgia Institute of TechnologyAmerican Institute of Physics, 2005-05)We present studies of the current–voltage characteristics of organic solar cells based on heterojunctions of pentacene and C60 as a function of illumination intensity. The photovoltaic response at a given illumination level ... -
Interaction potential and hopping dynamics governing sliding friction
(Georgia Institute of TechnologyAmerican Physical Society, 2003-08)The friction force on a nanometer-sized tip sliding on a surface is related to the thermally activated hopping of the contact atoms on an effective atomic interaction potential. A general analytical expression relates the ... -
Interface energetics and level alignment at covalent metal-molecule junctions: pi-conjugated thiols on gold
(Georgia Institute of TechnologyAmerican Physical Society, 2006-05)The energetics at the interfaces between metal and monolayers of covalently bound organic molecules is studied theoretically. Despite the molecules under consideration displaying very different frontier orbital energies, ... -
Inverted polymer solar cells with amorphous indium zinc oxide as the electron-collecting electrode
(Georgia Institute of TechnologyOptical Society of America, 2010-11)We report on the fabrication and performance of polymer-based inverted solar cells utilizing amorphous indium zinc oxide (a-IZO) as the electron-collecting electrode. Amorphous IZO films of 200 nm thickness were deposited ... -
Investigation of physical mechanisms in coupling photonic crystal waveguiding structures
(Georgia Institute of TechnologyOptical Society of America, 2004-10)We explain the fundamental physical mechanisms involved in coupling triangular lattice photonic crystal waveguides to conventional dielectric slab waveguides. We show that the two waveguides can be efficiently coupled ... -
Invited Article: Simultaneous mapping of temperature and stress in microdevices using micro-Raman spectroscopy
(Georgia Institute of TechnologyAmerican Institute of Physics, 2007-06)Analysis of the Raman Stokes peak position and its shift has been frequently used to estimate either temperature or stress in microelectronics and microelectromechanical system devices. However, if both fields are evolving ...