Now showing items 329-348 of 376

    • Tailoring the work function of indium tin oxide electrodes in electrophosphorescent organic light-emitting diodes 

      Sharma, Asha; Hotchkiss, Peter J.; Marder, Seth R.; Kippelen, Bernard (Georgia Institute of TechnologyAmerican Institute of Physics, 2009)
      We investigate the use of organic surface modifiers based on phosphonic acid anchoring groups that react with the surface of indium tin oxide (ITO) in order to modify its work function, surface energy, and the charge ...
    • Temperature and doping dependence of phonon lifetimes and decay pathways in GaN 

      Beechem, Thomas; Graham, Samuel (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-05)
      The lifetimes of polar optical phonons are known to affect both the electrical and thermal performances of gallium nitride (GaN) based devices. Hence, understanding the dynamical behavior of these phonons in GaN is integral ...
    • Temperature compensation method for resonant microsensors based on a controlled stiffness modulation 

      Seo, Jae Hyeong; Demirci, Kemal Safak; Byun, Albert; Truax, Stuart; Brand, Oliver (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-07-01)
      A strategy to compensate for frequency drifts caused by temperature changes in resonant microstructures is presented. The proposed compensation method is based on a controlled stiffness modulation of the resonator by an ...
    • A Temperature-Insensitive Third-Order Coupled-Resonator Filter for On-Chip Terabit/s Optical Interconnects 

      Li, Qing; Yegnanarayanan, Siva; Soltani, Mohammad; Alipour, Payam; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-12)
      We design and demonstrate a temperature-insensitive third-order coupled-resonator filter in the silicon-on-insulator platform for on-chip terabit/s optical interconnects. Optimum filter design enables up to 21 flat-band ...
    • Theoretical characterization of titanyl phthalocyanine as a p-type organic semiconductor: Short intermolecular π-π interactions yield large electronic couplings and hole transport bandwidths 

      Norton, Joseph E.; Brédas, Jean-Luc (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-01-21)
      The charge-transport properties of the triclinic phase II crystal of titanyl phthalocyanine (α-TiOPc) are explored within both a hopping and bandlike regime. Electronic coupling elements in convex- and concave-type dimers ...
    • Theoretical study of substitution effects on molecular reorganization energy in organic semiconductors 

      Geng, Hua; Niu, Yingli; Peng, Qian; Shuai, Zhigang; Coropceanu, Veaceslav; Brédas, Jean-Luc (Georgia Institute of TechnologyAmerican Institute of Physics, 2011-09)
      Chemical substitutions are powerful molecular design tools to enhance the performance of organic semiconductors, for instance, to improve solubility, intermolecular stacking, or film quality. However, at the microscopic ...
    • A theoretical view on self-assembled monolayers in organic electronic devices 

      Heimel, Georg; Romaner, Lorenz; Zojer, Egbert; Brédas, Jean-Luc (Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2008-04)
      Self-assembled monolayers (SAMs) of covalently bound organic molecules are rapidly becoming an integral part of organic electronic devices. There, SAMs are employed to tune the work function of the inorganic electrodes in ...
    • Thermal conduction from microcantilever heaters in partial vacuum 

      Lee, Jung Chul; Wright, Tanya L.; Abel, Mark R.; Sunden, Erik Oscar; Marchenkov, Alexei; Graham, Samuel; King, William P. (Georgia Institute of TechnologyAmerican Institute of Physics, 2007-01-01)
      This paper reports the thermal and electrical characteristics of a heated microcantilever in air and helium over a wide range of pressures. The cantilever heater size modulates thermal conductance between the cantilever ...
    • Thermal metrology of silicon microstructures using Raman spectroscopy 

      Abel, Mark R.; Wright, Tanya L.; King, William P.; Graham, Samuel (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2007-06)
      Thermal metrology of an electrically active silicon heated atomic force microscope cantilever and doped polysilicon microbeams was performed using Raman spectroscopy. The temperature dependence of the Stokes Raman peak ...
    • Thermal transport properties of thin films of small molecule organic semiconductors 

      Kim, Namsu; Domercq, Benoit; Yoo, SeungHyup; Christensen, Adam; Kippelen, Bernard; Graham, Samuel (Georgia Institute of TechnologyAmerican Institute of Physics, 2005-12)
      A series of harmonic Joule-heating experiments have been employed to determine the thermal conductivities of thin films of pentacene, N,N -diphenyl−N,N -di 3-methylphenyl − 1,1 -biphenyl -4,4 -diamine, and tris 8-hydroquinolinato ...
    • Third-order optical autocorrelator for time-domain operation at telecommunication wavelengths 

      Ramos-Ortiz, Gabriel; Cha, Myoungsik; Thayumanavan, S.; Mendez, J. C.; Marder, Seth R.; Kippelen, Bernard (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-07)
      We report on amorphous organic thin films that exhibit efficient third-harmonic generation at telecommunication wavelengths. At 1550 nm, micrometer-thick samples generate up to 17 mW of green light with input power of 250 ...
    • Three-beam interference lithography methodology 

      Stay, Justin L.; Burrow, Guy M.; Gaylord, Thomas K. (Georgia Institute of TechnologyAmerican Institute of Physics, 2011-02)
      Three-beam interference lithography represents a technology capable of producing two-dimensional periodic structures for applications such as micro- and nanoelectronics, photonic crystal devices, metamaterial devices, ...
    • Three-beam-interference lithography: contrast and crystallography 

      Stay, Justin L.; Gaylord, Thomas K. (Georgia Institute of TechnologyOptical Society of America, 2008-06)
      Specific configurations of three linearly polarized, monochromatic plane waves have previously been shown to be capable of producing interference patterns exhibiting symmetry inherent in 5 of the 17 plane groups. Starting ...
    • Three-dimensional band structure and bandlike mobility in oligoacene single crystals: A theoretical investigation 

      Cheng, Y. C.; Silbey, R. J.; da Silva Filho, Demetrio A.; Calbert, J. P.; Cornil, Jerome; Brédas, Jean-Luc (Georgia Institute of TechnologyAmerican Institute of Physics, 2003-02)
      Quantum-chemical calculations coupled with a tight binding band model are used to study the charge carrier mobilities in oligoacene crystals. The transfer integrals for all nonzero interactions in four crystalline oligoacenes ...
    • Three-dimensional converging-diverging Gaussian beam diffraction by a volume grating 

      Wu, Shun-Der; Gaylord, Thomas K.; Glytsis, Elias N.; Wu, Yu-Ming (Georgia Institute of TechnologyOptical Society of America, 2005-07)
      The diffraction characteristics of a volume grating (VG) illuminated by a three-dimensional (3-D) converging-diverging Gaussian beam at conical incidence are investigated by applying 3-D finite-beam (FB) rigorous coupled-wave ...
    • Three-photon absorption in anthracene-porphyrin-anthracene triads: A quantum-chemical study 

      Zhu, Lingyun; Yang, Xia; Yi, Yuanping; Xuan, Pengfei; Shuai, Zhigang; Chen, Dezhan; Zojer, Egbert; Brédas, Jean-Luc; Beljonne, David (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-12)
      We have applied correlated quantum-chemical methods to investigate the three-photon absorption (3PA) response of a porphyrin triad derivative, where the central macrocycle is linked in mesopositions to two anthracene units ...
    • Time-dependent signatures of acoustic wave biosensors 

      Hunt, William D.; Stubbs, Desmond D.; Lee, Sang-Hun (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-06)
      Acoustic wave devices coated with a biolayer represent one biosensor approach for the detection of medically relevant biomolecules. In a typical application, the acoustic wave device is connected in an oscillator circuit, ...
    • Tip size effects on atomic force microscopy nanoindentation of a gold single crystal 

      Lucas, Marcel; Gall, Ken; Riedo, Elisa (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-12-01)
      The effect of tip radius on atomic force microscopy (AFM) nanoindentation is investigated through indentation on the (111) face of a gold single crystal. The hardness is derived using two different methods: by measuring ...
    • A top surface imaging method using area selective ALD on chemically amplified polymer photoresist films 

      Sinha, Ashwini; Hess, Dennis W.; Henderson, Clifford L. (Georgia Institute of TechnologyElectrochemical Society, 2006)
      A method for performing top surface imaging TSI on a single polymeric photoresist film using area selective atomic layer deposition ALD is presented. In this method, exposure of the polymer thin film creates reactive ...
    • Top-gate hybrid complementary inverters using pentacene and amorphous InGaZnO thin-film transistors with high operational stability 

      Kim, Jungbae; Fuentes-Hernandez, Canek; Hwang, D. K.; Potscavage, William J., Jr.; Kippelen, Bernard (Georgia Institute of TechnologyAmerican Institute of Physics, 2012-03)
      We report on the operational stability of low-voltage hybrid organic-inorganic complementary inverters with a top-gate bottom source-drain geometry. The inverters are comprised of p-channel pentacene and n-channel amorphous ...