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8 Feb 2010

Volume 96, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 96, 063101 (2010); http://dx.doi.org/10.1063/1.3308512 (3 pages)

Takashi Yokoyama
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Crystallitic orientation effects on charge transport in polythiophene thin-film transistors

Liping Zhou, Xue-Feng Wang, Qin Han, Jian-Chun Wu, and Zhen-Ya Li

Appl. Phys. Lett. 96, 063301 (2010); http://dx.doi.org/10.1063/1.3310023 (3 pages)

Online Publication Date: 8 February 2010

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We simulate charge transport through polymer grain boundaries under the buried critical interface of polymer and dielectric in polythiophene thin-film transistors and find the recently observed enhancement of electronic conduction can be a result of optimized crystallitic orientation. The simulation is based on a first-principle description of the system with transport properties evaluated by nonequilibrium Green's function method. Highly oriented crystal is assumed inside each grain and four most probable configurations of crystallitic orientation for grain boundary are considered. The calculation confirms that the electronic conductance can differ by five orders in magnitude for different conformations.
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85.30.Tv Field effect devices
81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials
61.72.Mm Grain and twin boundaries
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Reversible optical nonreciprocity in periodic structures with liquid crystals

Andrey E. Miroshnichenko, Etienne Brasselet, and Yuri S. Kivshar

Appl. Phys. Lett. 96, 063302 (2010); http://dx.doi.org/10.1063/1.3300824 (3 pages) | Cited 7 times

Online Publication Date: 10 February 2010

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We demonstrate how to achieve reversible nonreciprocal optical response in a periodic photonic structure with a pair of defects, one of them being a nonlinear liquid crystal defect layer. The twin defect structure is symmetric at low intensity and becomes asymmetric above an intensity threshold that corresponds to the optical reordering of the liquid crystal. We show that nonreciprocal effects can be reversed by changing the wavelength as a consequence of the wavelength dependent light localization at the defect mode inside the structure.
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42.70.Df Liquid crystals
61.30.Jf Defects in liquid crystals
42.70.Qs Photonic bandgap materials
78.67.Pt Multilayers; superlattices; photonic structures; metamaterials
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MoO3/poly(9,9-dioctylfluorene-co-N-[4-(3-methylpropyl)]-diphenylamine) double-interlayer effect on polymer solar cells

Jegadesan Subbiah, Do Young Kim, Michael Hartel, and Franky So

Appl. Phys. Lett. 96, 063303 (2010); http://dx.doi.org/10.1063/1.3310013 (3 pages) | Cited 23 times

Online Publication Date: 12 February 2010

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A double interlayer composed of MoO3 and poly(9,9-dioctylfluorene-co-N-[4-(3-methylpropyl)]-diphenylamine) (TFB) was used as an anode contact for bulk heterojunction polymer solar cells. Using this strategy, photovoltaic cells with poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene]: [6,6]-phenyl-C61 butyric acid methyl ester (MDMO-PPV:PCBM) blend as a photoactive layer were fabricated. An enhancement in power conversion efficiency of 53% was observed in cells with a double interlayer compared with cells having a PEDOT: PSS interlayer. The enhancement is attributed to the combined effects of electron blocking and enhanced charge extraction from the photoactive layer to the anode.
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88.40.jr Organic photovoltaics
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
85.60.-q Optoelectronic devices
88.40.jp Multijunction solar cells
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