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- 1. Phys. Rev. B 75, 195206 (2007) , “Effect of defect-enhanced molecular oxygen adsorption on the imbalance of hole versus electron mobility in conjugated polymers”, Chi-Ken Lu, Shu-Ting Pi, and Hsin-Fei MengThe generally observed higher hole mobility relative to electron mobility in conjugated polymers is explained with the defects and adsorbed molecular oxygen. Adsorption of the extrinsic molecular oxygen leads to that electrons are bound more tightly than holes by the traps in the originally... (Read more)
- 2. Phys. Rev. B 75, 115127 (2007) , “Molecular microelectrostatic view on electronic states near pentacene grain boundaries”, Stijn Verlaak and Paul HeremansGrain boundaries are the most inevitable and pronounced structural defects in pentacene films. To study the effect of those structural defects on the electronic state distribution, the energy levels of a hole on molecules at and near the defect have been calculated using a submolecular... (Read more)
- 3. Phys. Rev. Lett. 98, 220501 (2007) , “Efficient Dynamic Nuclear Polarization at High Magnetic Fields”, Gavin W. Morley, Johan van Tol, Arzhang Ardavan, Kyriakos Porfyrakis, Jinying Zhang, and G. Andrew D. BriggsBy applying a new technique for dynamic nuclear polarization involving simultaneous excitation of electronic and nuclear transitions, we have enhanced the nuclear polarization of the nitrogen nuclei in 15N@C60 by a factor of 103 at a fixed temperature of 3 K and a... (Read more)
- 4. Phys. Rev. Lett. 98, 206406 (2007) , “Role of Intermolecular Coupling in the Photophysics of Disordered Organic Semiconductors: Aggregate Emission in Regioregular Polythiophene”, Jenny Clark, Carlos Silva, Richard H. Friend, and Frank C. SpanoWe address the role of excitonic coupling on the nature of photoexcitations in the conjugated polymer regioregular poly(3-hexylthiophene). By means of temperature-dependent absorption and photoluminescence spectroscopy, we show that optical emission is overwhelmingly dominated by weakly coupled H... (Read more)
- 5. Appl. Phys. Lett. 89, 063503 (2006) , “Degradation mechanism of organic light-emitting device investigated by scanning photoelectron microscopy coupled with peel-off technique”, H. J. Shin, M. C. Jung, J. Chung, K. Kim, J. C. Lee, and S. P. LeeThe authors present space-resolved spectroscopic data on organic layers of a degraded organic light-emitting device. The data were obtained using a scanning photoelectron microscope (SPEM) coupled with peel-off technique to directly probe the uncontaminated organic layers, which were covered with... (Read more)
- 6. J. Appl. Phys. 100, 034318 (2006) , “Electric-field-induced quenching of photoluminescence in photoconductive organic thin film structures based on Eu3+ complexes”, J. Kalinowski, W. Stampor, M. Cocchi, D. Virgili, and V. FattoriA large electric field effect on photoluminescence (PL) from electroluminescent emitters sandwiched between two high-work-function electrodes is reported and a model of the effect formulated. We examine the PL behavior of Eu3+ complex-based organic thin films subjected to increasing... (Read more)
- 7. J. Appl. Phys. 100, 023712 (2006) , “Exciton migration in organic thin films”, Y. C. Zhou, Y. Wu, L. L. Ma, J. Zhou, X. M. Ding, and X. Y. HouLimitations of the analytical method for calculating the exciton distribution in organic thin films, attributed to the improper boundary conditions when the organic film approaches the exciton diffusion length, were analyzed by comparison with an exciton random walk simulation. The random walk... (Read more)
- 8. Phys. Rev. B 74, 235104 (2006) , “Longitudinal and transverse diffusion of conduction-electron spins on stacks of fluoranthene radical cations”, David Saez de Jauregui, Jürgen Gmeiner, and Elmar DormannThe temperature dependence and anisotropy of the conduction-electron spin diffusion coefficient D(T) of three single crystals of the organic conductor (fluoranthene)2PF6 with defect content varying between 7×10−5 and 1% per formula unit have... (Read more)
- 9. Phys. Rev. B 74, 045213 (2006) , “Hyperfine interaction and magnetoresistance in organic semiconductors”, Y. Sheng, T. D. Nguyen, G. Veeraraghavan, Ö. Mermer, M. Wohlgenannt, S. Qiu, and U. ScherfWe explore the possibility that hyperfine interaction causes the recently discovered organic magnetoresistance (OMAR) effect. We deduce a simple fitting formula from the hyperfine Hamiltonian that relates the saturation field of the OMAR traces to the hyperfine coupling constant. We compare the... (Read more)
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