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11 Oct 2010

Volume 97, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 97, 154101 (2010); http://dx.doi.org/10.1063/1.3479052 (3 pages)

Younggeun Park, Yeonho Choi, Debkishore Mitra, Taewook Kang, and Luke P. Lee
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Light-configured mesogenic azopolymer stabilized liquid crystals

Olivier Thibault-Maheu, Tigran Galstian, André Bessette, and Yue Zhao

Appl. Phys. Lett. 97, 153301 (2010); http://dx.doi.org/10.1063/1.3499757 (3 pages) | Cited 1 time

Online Publication Date: 11 October 2010

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Triple-functionality guest is introduced into nematic liquid crystal host. Resonant interaction of light with the azobenzene segment of the guest and the mesogeneity of the latter are used to generate reorientation of host molecules. The reactive character of the guest is then used to permanently fix the obtained molecular orientation of the whole guest-host system. Electro-optic study of obtained material is provided to quantify the parameters of the obtained orientational configuration.
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42.70.Df Liquid crystals
78.15.+e Optical properties of fluid materials, supercritical fluids and liquid crystals
61.30.Vx Polymer liquid crystals
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
78.20.Jq Electro-optical effects
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Electrical charging of Au nanoparticles embedded by streptavidin-biotin biomolecular binding in organic memory device

Sung Mok Jung, Hyung-Jun Kim, Bong-Jin Kim, Yong-Sang Kim, Tae-Sik Yoon, and Hyun Ho Lee

Appl. Phys. Lett. 97, 153302 (2010); http://dx.doi.org/10.1063/1.3500824 (3 pages) | Cited 6 times

Online Publication Date: 11 October 2010

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In this study, electrical charging phenomena in an organic memory structure using Au nanoparticles (NPs) conjugated with a specific binding mechanism were demonstrated. Monolayer of streptavidin-passivated Au NPs was incorporated on biotin-coated SiO2 in structure of metal-pentacene-insulator-silicon (MPIS) device. Clockwise and counter-clockwise capacitance-voltage (C-V) hysteresis loops were measured depending on the oxide thickness. For 30 nm, a clockwise C-V hysteresis having memory window of 0.68 V was obtained under (+/−)12 V sweep range, while a counter-clockwise C-V hysteresis having memory window of 6.47 V was obtained under (+/−)7 V sweep range for 10 nm thick oxide.
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85.65.+h Molecular electronic devices
85.30.Tv Field effect devices
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A one-dimensional photonic-crystal nanocavity incorporating a fluorescent molecular dye

Mohamed M. Murshidy, Ali M. Adawi, Paul W. Fry, and David G. Lidzey

Appl. Phys. Lett. 97, 153303 (2010); http://dx.doi.org/10.1063/1.3497647 (3 pages) | Cited 3 times

Online Publication Date: 12 October 2010

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We model the optical properties of a SiN based one-dimensional waveguide photonic crystal nanocavity with three tapered air holes as a function of the photonic crystal mirror fill factor using finite difference time domain calculations. We show that the Q-factor of this type of cavity has a strong dependence on the mirror fill factor, with a Q-factor as high as 35 000 predicted. Experimental studies on a range of representative structures whose surface is coated with a layer of a fluorescent dye confirm our modeling and reveal that such structures are characterized by a single optical mode having a Q-factor of 2000.
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42.79.Gn Optical waveguides and couplers
42.70.Qs Photonic bandgap materials
42.70.Jk Polymers and organics
42.79.Bh Lenses, prisms and mirrors
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Indium tin oxide-free and metal-free semitransparent organic solar cells

Yinhua Zhou, Hyeunseok Cheun, Seungkeun Choi, William J. Potscavage, Jr., Canek Fuentes-Hernandez, and Bernard Kippelen

Appl. Phys. Lett. 97, 153304 (2010); http://dx.doi.org/10.1063/1.3499299 (3 pages) | Cited 29 times

Online Publication Date: 12 October 2010

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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 top electrodes. The PH1000 film showed a conductivity of 680±50 S/cm. A ZnO layer was used as an interlayer to produce an electron-selective electrode. The semitransparent devices with a structure of glass/PH1000/ZnO/poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester/PEDOT:PSS (CPP 105 D)/PH1000 exhibited an average power conversion efficiency of 1.8% estimated for 100 mW/cm2 air mass 1.5 global illumination. This geometry alleviates the need of vacuum deposition of a top electrode.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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Internal potential distribution in organic light emitting diodes measured by dc bridge

X. R. Yin, Y. K. Le, X. D. Gao, Z. Y. Sun, and X. Y. Hou

Appl. Phys. Lett. 97, 153305 (2010); http://dx.doi.org/10.1063/1.3500837 (3 pages) | Cited 2 times

Online Publication Date: 12 October 2010

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Internal potential distribution of organic light-emitting diodes (OLEDs) is an essential problem. By using dc bridge to eliminate errors due to high resistance of the devices at low bias, the potential distribution has been accurately measured for both double-layer and single-layer OLEDs. It is found that the electric field inside the device is not uniform, and the potential distribution changes with external bias. This phenomenon could be the effect of space charge originating from the unequal injections of holes and electrons, which is confirmed by the results of the device with modified work function of the anode.
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85.60.Jb Light-emitting devices
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Impact of interfacial dipole on carrier transport in bulk heterojunction poly(3-hexylthiophene) and [6,6]-phenyl C61-butyric acid methyl ester blends

S. W. Tsang, N. Drolet, S. C. Tse, Y. Tao, and Z. H. Lu

Appl. Phys. Lett. 97, 153306 (2010); http://dx.doi.org/10.1063/1.3499368 (3 pages) | Cited 1 time

Online Publication Date: 14 October 2010

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The electron transport properties in various poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PC61BM) blend films, prepared by various process conditions, were investigated by admittance spectroscopy at different temperatures. It was found that the electron mobility and the dispersive transport behavior showed a strong dependence on the thermal treatment condition; the blend with the fastest growth rate had orders of magnitude reduction in the mobility and a much more dispersive transport. Using the Gaussian disorder model, it was found that the energetic disorder of the density-of-states between blends plays a significant role in the observed phenomena. It is proposed that the difference in the energetic disorder is due to the interfacial dipole effect at the P3HT/PC61BM heterojunctions in the various blend films.
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73.61.Ph Polymers; organic compounds
72.20.Fr Low-field transport and mobility; piezoresistance
73.50.Dn Low-field transport and mobility; piezoresistance
81.40.Gh Other heat and thermomechanical treatments
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