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18 Jun 2012

Volume 100, Issue 25, Articles (25xxxx)

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Appl. Phys. Lett. 100, 252401 (2012); http://dx.doi.org/10.1063/1.4727909 (4 pages)

Ming Yan, Christian Andreas, Attila Kákay, Felipe García-Sánchez, and Riccardo Hertel
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Coupled plasmonic modes in organic planar microcavities

Mauro Furno, Malte C. Gather, Björn Lüssem, and Karl Leo

Appl. Phys. Lett. 100, 253301 (2012); http://dx.doi.org/10.1063/1.4729820 (4 pages) | Cited 1 time

Online Publication Date: 20 June 2012

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We report on the nature of the resonant modes in organic planar microcavities featuring semi-transparent metallic layers. We theoretically demonstrate that symmetric microcavities support a total of four modes originating from the coupling of surface plasmon polaritons. For red top-emitting organic light-emitting diodes with one semi-transparent metallic electrode, we identify three coupled plasmonic modes and calculate a light outcoupling efficiency close to 34% when assuming emitters with isotropic transition dipole moment. This value is estimated to increase to 50% in the case the dipole moment is purely horizontal.
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42.82.-m Integrated optics
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Carrier transport mechanism of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) films by incorporating ZnO nanoparticles

Yow-Jon Lin (林祐仲), Cheng-Lung Tsai (蔡丞龍), Yu-Chao Su (蘇郁超), and Day-Shan Liu (劉代山)

Appl. Phys. Lett. 100, 253302 (2012); http://dx.doi.org/10.1063/1.4730391 (4 pages) | Cited 2 times

Online Publication Date: 20 June 2012

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The carrier transport mechanism of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT:PSS) having ZnO nanoparticles, denoted ZnO-doped PEDOT:PSS, is investigated. Conductivity proportional to ZnO doping was observed at 300 K. The improved electrical conductivity is considered to mainly come from the mobility enhancement. The carrier mobility in ZnO-doped PEDOT:PSS samples exhibits unexpectedly strong temperature dependence, implying the domination of tunneling in the whole range of temperatures. An exhibition of high mobility of ZnO-doped PEDOT:PSS samples is attributed to a combined effect of the weak electron-phonon couplings and changes in the chemical structure of PEDOT:PSS.
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72.20.Fr Low-field transport and mobility; piezoresistance
73.50.Dn Low-field transport and mobility; piezoresistance
73.61.Ph Polymers; organic compounds
73.40.Gk Tunneling
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Solution processed LiF anode modification for polymer solar cells

Ayse Turak, Taner Aytun, and Cleva W. Ow-Yang

Appl. Phys. Lett. 100, 253303 (2012); http://dx.doi.org/10.1063/1.4729932 (4 pages)

Online Publication Date: 21 June 2012

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The indium-tin-oxide/active layer interface is critical to the performance of organic solar cell devices. In this study, submonolayer films of LiF nanoparticles are deposited on the electrode surface with the assistance of polymeric micelle reactors, with controlled nanoscale surface coverage. Incorporation of the solution-processed bi-layer electrodes into a conventional poly(3-hexyl-thiophene): [6,6]-phenyl C61-butyric acid methyl ester device shows significant improvement in device performance, especially when used in combination with a poly(3,4-ethylenedioxythiophene: poly(styrene sulfonate) layer. The nearly 5× improvement in the short circuit current and decrease in the contact resistance is mostly likely related to the increase in surface work function from the use of LiF nanoparticles. The results strongly indicate that engineering of the interfaces is a useful tool for future device optimization.
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82.45.Fk Electrodes
88.40.H- Solar cells (photovoltaics)
88.40.jr Organic photovoltaics
73.30.+y Surface double layers, Schottky barriers, and work functions
73.40.Cg Contact resistance, contact potential
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