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6 Dec 2010

Volume 97, Issue 23, Articles (23xxxx)

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Appl. Phys. Lett. 97, 233101 (2010); http://dx.doi.org/10.1063/1.3523252 (3 pages)

Hoonkyung Lee, Marvin L. Cohen, and Steven G. Louie
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Conductance-dependent negative differential resistance in organic memory devices

Y. T. You, M. L. Wang, H. N. Xuxie, B. Wu, Z. Y. Sun, and X. Y. Hou

Appl. Phys. Lett. 97, 233301 (2010); http://dx.doi.org/10.1063/1.3524263 (3 pages) | Cited 3 times

Online Publication Date: 6 December 2010

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Single-layer organic memories made of organic material with good conductance have been characterized. Asymmetrical bistable behaviors under biases of opposite polarities are observed for devices with asymmetric electrodes. It is experimentally confirmed that a close correlation exists between the conductivity of the organic layer and the asymmetric bistability of the device under opposite biases. Inserting a block layer or thickening the organic layer will result in negative differential resistance under positive biases, leading to reversible symmetrical bistability. The phenomena are ascribed to the presence of filamentary microconducting channels in the organic layer.
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85.30.De Semiconductor-device characterization, design, and modeling
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Nongeminate carrier recombination rates in organic solar cells

Christopher Lombardo and Ananth Dodabalapur

Appl. Phys. Lett. 97, 233302 (2010); http://dx.doi.org/10.1063/1.3524025 (3 pages) | Cited 3 times

Online Publication Date: 7 December 2010

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Ambipolar organic thin-film transistors and lateral resistor structures have been used to study the transport of charge carriers in bulk heterojunction (BHJ) organic photovoltaic devices. Active layers of a phase-separated blend of poly(3-hexylthiophene) and [6,6]-phenyl C61-butyric acid methyl ester were chosen due to their wide use in BHJ solar cell devices. A new method for determining nongeminate recombination rates is reported. Field dependent measurements of the recombination rate show that recombination decreases with increasing electric field.
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88.40.jr Organic photovoltaics
85.30.Tv Field effect devices
84.32.Ff Conductors, resistors (including thermistors, varistors, and photoresistors)
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Electroluminescence imaging of organic photovoltaic modules

U. Hoyer, M. Wagner, Th. Swonke, J. Bachmann, R. Auer, A. Osvet, and C. J. Brabec

Appl. Phys. Lett. 97, 233303 (2010); http://dx.doi.org/10.1063/1.3521259 (3 pages) | Cited 1 time

Online Publication Date: 8 December 2010

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We report on electroluminescence (EL) imaging of organic photovoltaic cells and modules with poly(3-hexylthiophene)/[6,6]-phenyl C61 butyric acid methyl ester as semiconductor layer. The dominant EL emission is found in a spectral regime between 1200 and 1400 nm and is identified as the radiative decay of the charge transfer complex formed between the polymer and the fullerene. Electroluminescence emission from the pristine compounds is either much weaker or completely absent. Overall, electroluminescence imaging is shown to give valuable information on the defects but also on the performance of organic solar modules.
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88.40.jr Organic photovoltaics
88.40.H- Solar cells (photovoltaics)
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Experimental observation of polarized electroluminescence from edge-emission organic light emitting devices

G. Z. Ran, D. F. Jiang, Q. Kan, and H. D. Chen

Appl. Phys. Lett. 97, 233304 (2010); http://dx.doi.org/10.1063/1.3525161 (3 pages) | Cited 1 time

Online Publication Date: 9 December 2010

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We have observed a strongly polarized edge-emission from an organic light emitting device (OLED) with a silicon anode and a stacked Sm/Au (or Ag) cathode. For the OLED with a Sm/Au cathode, the transverse magnetic (TM) mode is stronger than the transverse electric (TE) mode by a factor of 2, while the polarization ratio of TM:TE is close to 300 for that with a Sm/Ag cathode. The polarization results from the scattering of surface plasmon polaritons at the device boundary. Such a silicon-based OLED is potentially an electrically excited SPP source in plasmonics.
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85.60.Jb Light-emitting devices
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