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25 Dec 2006

Volume 89, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 89, 263110 (2006); http://dx.doi.org/10.1063/1.2424541 (3 pages)

Ch. Deneke, U. Zschieschang, H. Klauk, and O. G. Schmidt
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Direct writing of silver conductive patterns: Improvement of film morphology and conductance by controlling solvent compositions

Dongjo Kim, Sunho Jeong, Bong Kyun Park, and Jooho Moon

Appl. Phys. Lett. 89, 264101 (2006); http://dx.doi.org/10.1063/1.2424671 (3 pages) | Cited 54 times

Online Publication Date: 27 December 2006

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The authors have investigated the influence of conductive ink compositions on the quality of ink-jet printed patterns. Controlling the solvent compositions plays an important role of reducing the so-called coffee ring effect. The use of a higher boiling point solvent with lower surface tension such as ethylene glycol enables the formation of a uniform deposit of silver nanoparticles due to surface tension gradient-induced inward Marangoni flow, which can compensate outward convective flow. It is demonstrated that the ink-jet printed film quality is directly related to the resistance difference in the conductive patterns.
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81.16.Rf Micro- and nanoscale pattern formation
81.07.-b Nanoscale materials and structures: fabrication and characterization
73.61.At Metal and metallic alloys
85.40.Hp Lithography, masks and pattern transfer
68.55.-a Thin film structure and morphology

Dissociation of iridium(III) phosphorescent emitters upon adsorption on Cu(110) revealed by scanning tunneling microscopy

H. Gersen, R. Schaub, W. Xu, I. Stensgaard, E. Laegsgaard, T. R. Linderoth, F. Besenbacher, Md. K. Nazeeruddin, and M. Graetzel

Appl. Phys. Lett. 89, 264102 (2006); http://dx.doi.org/10.1063/1.2424675 (3 pages) | Cited 1 time

Online Publication Date: 28 December 2006

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The phosphorescent emitters used in organic light emitting diodes (OLEDs) play a crucial role for tuning the color and the luminescence intensity. The authors have investigated by scanning tunneling microscopy the adsorption of iridium(III) phosphorescent emitter molecules used in OLEDs on a partly oxidized Cu(110) surface. Surprisingly they find that 50% of the emitters have dissociated upon adsorption at the substrate. The findings suggest that the decrease in the lifetime of OLEDs, which are manufactured by vacuum vaporization technique, is due to the dissociation of emitter molecules present in the device.
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82.30.Lp Decomposition reactions (pyrolysis, dissociation, and fragmentation)
85.60.Jb Light-emitting devices
78.55.Hx Other solid inorganic materials
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
68.43.Mn Adsorption kinetics

General reconstruction formulas for analyzer-based computed tomography

Ya. I. Nesterets, T. E. Gureyev, and S. W. Wilkins

Appl. Phys. Lett. 89, 264103 (2006); http://dx.doi.org/10.1063/1.2423325 (3 pages) | Cited 4 times

Online Publication Date: 29 December 2006

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General formulas are derived for computed tomography reconstruction in analyzer-based imaging. Two image acquisition geometries are investigated. In the first geometry, which is widely used, the rotation axis of the object is perpendicular to that of the analyzer crystal. In the second geometry, in which the rotation axes are parallel, the reconstruction formulas are shown to be significantly simpler and more stable with respect to noise in experimental data.
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42.30.Wb Image reconstruction; tomography
81.70.Tx Computed tomography
87.59.bd Computed radiography
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