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20 Sep 2010

Volume 97, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 97, 123101 (2010); http://dx.doi.org/10.1063/1.3490637 (3 pages)

Mark W. Licurse and Peter K. Davies
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Frequency dependence of organic magnetoresistance

W. Wagemans, P. Janssen, E. H. M. van der Heijden, M. Kemerink, and B. Koopmans

Appl. Phys. Lett. 97, 123301 (2010); http://dx.doi.org/10.1063/1.3491217 (3 pages) | Cited 7 times

Online Publication Date: 20 September 2010

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To identify the microscopic mechanisms of organic magnetoresistance (OMAR), the dependency on the frequency of the applied magnetic field is explored, which consists of a dc and ac component. The measured magnetoconductance decreases when the frequency is increased. The decrease is stronger for lower voltages, which is shown to be linked to the presence of a negative capacitance, as measured with admittance spectroscopy. The negative capacitance disappears when the frequency becomes comparable to the inverse transit time of the minority carriers. These results are in agreement with recent interpretations that magnetic field effects on minority carrier mobility dominate OMAR.
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72.20.My Galvanomagnetic and other magnetotransport effects
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
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Polymer grating imbedded organic light emitting diodes with improved out-coupling efficiency

Ji-Hyang Jang, Min-Cheol Oh, Tae-Hoon Yoon, and Jae Chang Kim

Appl. Phys. Lett. 97, 123302 (2010); http://dx.doi.org/10.1063/1.3491286 (3 pages) | Cited 7 times

Online Publication Date: 20 September 2010

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Organic light emitting diodes with enhanced external light coupling efficiency are demonstrated by incorporating a polymeric diffraction grating fabricated directly on top of the indium tin-oxide (ITO) electrode. Compared to the previous inorganic diffraction gratings fabricated under the ITO electrode, the polymer grating prepared by convenient lithography facilitates the fabrication process and provides good compatibility with conventional production facilities. In spite of the reduction in the emitting area, the luminance efficiency is improved by 72% by imbedding the polymer grating. The strong scattering of the guided mode enables the device to have negligible wavelength dispersion.
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85.60.Jb Light-emitting devices
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Dual-gate field-effect transistors of octathio[8]circulene thin-films with ionic liquid and SiO2 gate dielectrics

Takuya Fujimoto, Michio M. Matsushita, and Kunio Awaga

Appl. Phys. Lett. 97, 123303 (2010); http://dx.doi.org/10.1063/1.3491807 (3 pages) | Cited 5 times

Online Publication Date: 22 September 2010

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Dual-gate organic thin-film transistors (OTFTs) of octathio[8]circulene (1) with ionic liquid and SiO2 gate dielectrics lead to good transistor performance with a high on/off ratio ( ∼ 105), a low threshold voltage ( ∼ −5 V), a low subthreshold slope ( ∼ 150 mV/decade), and low power operation, thus surpassing the performance of the single-gate OTFTs of 1. This operation is a promising method for improving the carrier concentrations in OTFTs and for realizing high-performance OTFTs.
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85.30.Tv Field effect devices
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Effect of the gate electrode on the response of organic electrochemical transistors

Giuseppe Tarabella, Clara Santato, Sang Yoon Yang, Salvatore Iannotta, George G. Malliaras, and Fabio Cicoira

Appl. Phys. Lett. 97, 123304 (2010); http://dx.doi.org/10.1063/1.3491216 (3 pages) | Cited 13 times

Online Publication Date: 22 September 2010

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Organic electrochemical transistors (OECTs) are attracting a great deal of interest for biosensing and bioelectronics applications. However, their device physics is not yet well-understood. In this paper, we focus on the effect of the gate electrode material on the response of OECTs. We studied OECTs made from the conducting polymer poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate), and which utilized halide electrolytes. We demonstrate that OECTs with Ag gate electrodes show larger current modulation compared to OECTs with Pt gate electrodes. This effect is due to a change in the OECT regime of operation from capacitive, in case of a Pt gate electrode, to Faradaic, in the case of an Ag electrode.
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85.30.Tv Field effect devices
82.47.-a Applied electrochemistry
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Remote doping of a pentacene transistor: Control of charge transfer by molecular-level engineering

Wei Zhao, Yabing Qi, Tissa Sajoto, Stephen Barlow, Seth R. Marder, and Antoine Kahn

Appl. Phys. Lett. 97, 123305 (2010); http://dx.doi.org/10.1063/1.3491429 (3 pages) | Cited 6 times

Online Publication Date: 22 September 2010

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We demonstrate that holes from a p-doped N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (α-NPD) layer transfer to an adjacent pentacene film. The spatial separation of carriers from dopants, or remote doping, is demonstrated with a combination of photoemission spectroscopy and current-voltage measurements for a p-doped α-NPD/pentacene heterojunction. Increased conductivity of the pentacene film is observed in both nongated temperature-dependent conductivity and gated thin-film transistor measurements.
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81.05.Fb Organic semiconductors
85.30.Tv Field effect devices
79.60.Bm Clean metal, semiconductor, and insulator surfaces
73.61.Ph Polymers; organic compounds
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
61.72.up Other materials
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Microwave annealing of polymer solar cells with various transparent anode materials

H. Flügge, H. Schmidt, T. Riedl, S. Schmale, T. Rabe, J. Fahlbusch, M. Danilov, H. Spieker, J. Schöbel, and W. Kowalsky

Appl. Phys. Lett. 97, 123306 (2010); http://dx.doi.org/10.1063/1.3491213 (3 pages) | Cited 4 times

Online Publication Date: 23 September 2010

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Efficient organic solar cells were produced through annealing with microwave radiation (2.45 GHz) within only 8 s. Efficiencies of up to 3% were obtained, similar to those of devices annealed with a hot plate for 300 s. We examined the effect of microwave irradiation on the individual layers of the solar cell architecture. Microwave absorption was found to be related exclusively to the sheet resistance of the layers. As a result, in a polymer solar cell comprising an electrode based on a transparent conducting oxide (TCO) the microwave annealing is evidenced to be directly linked to the microwave absorption in the TCO layer.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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