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7 May 2012

Volume 100, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 100, 191901 (2012); http://dx.doi.org/10.1063/1.4709436 (4 pages)

Muamer Kadic, Tiemo Bückmann, Nicolas Stenger, Michael Thiel, and Martin Wegener
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Non-volatile organic memory devices comprising SiO2 and C60 showing 104 switching cycles

P. Siebeneicher, H. Kleemann, K. Leo, and B. Lüssem

Appl. Phys. Lett. 100, 193301 (2012); http://dx.doi.org/10.1063/1.4712057 (4 pages)

Online Publication Date: 8 May 2012

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We present a non-volatile organic memory device comprising a thin SiO2 layer, the organic semiconductor C60, and an organic n-type doped layer between two metallic electrodes. The memory device shows a stable hysteresis in the current-voltage characteristics with an ON/OFF ratio in the range of three or higher and reasonable switching behavior with 104 write-read-erase-read cycles. The data retention time reaches from several hours up to several days and depends on the read out frequency. We exclude a filamentary conduction mechanism as cause of the memory effect and propose that the presence of charge carrier traps at the interface of the C60 layer with the oxide causes the hysteresis of this organic non-volatile memory device.
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84.30.Sk Pulse and digital circuits
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Direct and charge transfer state mediated photogeneration in polymer–fullerene bulk heterojunction solar cells

M. Mingebach, S. Walter, V. Dyakonov, and C. Deibel

Appl. Phys. Lett. 100, 193302 (2012); http://dx.doi.org/10.1063/1.4711849 (4 pages) | Cited 9 times

Online Publication Date: 8 May 2012

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We investigated photogeneration yield and recombination dynamics in blends of poly(3-hexyl thiophene) (P3HT) and poly[2-methoxy-5 -(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) with [6,6]-phenyl-C61butyric acid methyl ester (PC61BM) by means of temperature dependent time delayed collection field measurements. In MDMO-PPV:PC61BM, we find a strongly field dependent polaron pair dissociation which can be attributed to geminate recombination in the device. Our findings are in good agreement with field dependent photoluminescence measurements published before, supporting a scenario of polaron pair dissociation via an intermediate charge transfer state. In contrast, polaron pair dissociation in P3HT:PC61BM shows only a very weak field dependence, indicating an almost field independent polaron pair dissociation or a direct photogeneration. Furthermore, we found Langevin recombination for MDMO-PPV:PC61BM and strongly reduced Langevin recombination for P3HT:PC61BM.
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88.40.jp Multijunction solar cells
88.40.H- Solar cells (photovoltaics)
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Topological asymmetry induced electronic transport in three terminal graphene nanoribbon structure

En-Jia Ye, Wen-Quan Sui, and Xuean Zhao

Appl. Phys. Lett. 100, 193303 (2012); http://dx.doi.org/10.1063/1.4714506 (4 pages) | Cited 1 time

Online Publication Date: 10 May 2012

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Topological configurations play an important role in graphene nanoribbon based devices. In this work, the Büttiker’s ac transport theory is used to study an asymmetric three terminal graphene nanoribbon structure. With the help of Green’s function and related parameters, we show that the topological asymmetries can form capacitive and inductive junctions in this three terminal structure. The transport properties are sensitive to the geometric features of the branches of the junctions and the coupling positions. It is believed that this kind of structure can be useful for the future nanoelectronic devices.
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73.63.Bd Nanocrystalline materials
81.07.Bc Nanocrystalline materials
72.80.Vp Electronic transport in graphene
81.05.ue Graphene
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