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30 May 2011

Volume 98, Issue 22, Articles (22xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 223101 (2011); http://dx.doi.org/10.1063/1.3595266 (3 pages)

Takahiro Ohori, Yasuhide Ohno, Kenzo Maehashi, Koichi Inoue, Yutaka Hayashi, and Kazuhiko Matsumoto
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Effect of source-drain electric field on the Meyer–Neldel energy in organic field effect transistors

Mujeeb Ullah, A. Pivrikas, I. I. Fishchuk, A. Kadashchuk, P. Stadler, C. Simbrunner, N. S. Sariciftci, and H. Sitter

Appl. Phys. Lett. 98, 223301 (2011); http://dx.doi.org/10.1063/1.3584131 (3 pages) | Cited 2 times

Online Publication Date: 31 May 2011

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We studied the influence of the lateral source-drain electric field on the Meyer–Neldel phenomenon observed for the charge mobility measured in C60-based organic field effect transistors (OFETs). It was found that the characteristic Meyer-Neldel temperature notably shifts with applied source drain electric field. This finding is in excellent agreement with an analytic model recently extended to account also for the field dependence of the charge carrier mobility in materials with a Gaussian density-of-states distribution. As the theoretical model to predict charge carrier mobility is not limited to zero-electric field, it provides a more accurate evaluation of energetic disorder parameters from experimental data measured at arbitrary electric fields.
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85.30.Tv Field effect devices
72.20.Fr Low-field transport and mobility; piezoresistance
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Mobility increase in poly [2-methoxy-5-(2′-ethylhexyloxy)-1, 4-phenylenevinylene] blended with graphene

T. Sun, Z. D. Guo, Y. T. Gu, H. Y. Li, G. F. Dong, Z. J. Shi, L. Dai, and G. G. Qin

Appl. Phys. Lett. 98, 223302 (2011); http://dx.doi.org/10.1063/1.3595327 (3 pages) | Cited 2 times

Online Publication Date: 31 May 2011

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Poly [2-methoxy-5-(2′-ethylhexyloxy)-1, 4-phenylenevinylene] (MEH-PPV) is an important polymer material. However, the low carrier mobility of MEH-PPV limits its applications. Graphene is a two dimensional material with very high carrier mobility. In this letter, we report increasing the mobility of MEH-PPV by blending it with graphene nanosheets synthesized by the arc discharge method. Both the hole and electron mobilities of MEH-PPV blended with graphene nanosheets increase monotonically with the blending content. The increase can be as high as one order of magnitude at blending content of about 2.5%. Little fluorescence quenching is observed in the graphene blended MEH-PPV.
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72.20.Fr Low-field transport and mobility; piezoresistance
72.80.Le Polymers; organic compounds (including organic semiconductors)
78.55.Kz Solid organic materials
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Enhancement-mode polymer space-charge-limited transistor with low switching swing of 96 mV/decade

Yu-Chiang Chao, Hung-Kuo Tsai, Hsiao-Wen Zan, Yung-Hsuan Hsu, Hsin-Fei Meng, and Sheng-Fu Horng

Appl. Phys. Lett. 98, 223303 (2011); http://dx.doi.org/10.1063/1.3586255 (3 pages) | Cited 4 times

Online Publication Date: 31 May 2011

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In this letter, an enhancement-mode polymer space-charge-limited transistor was realized with a low switching swing of 96 mV/decade, a low operation voltage of 1.5 V, and a high on/off current ratio of 104. By investigating the influence of the device’s geometric parameters on the transistor characteristics, a low switching swing was obtained by positioning the base electrode at the middle of the channel length and reducing the opening diameter. Simulations of the potential distribution at the central vertical channel verified that the base electrode has the best control over the magnitude of potential barrier, resulting in a low switching swing.
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85.30.Tv Field effect devices
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Measurement of thermal modulation of optical absorption in pump-probe spectroscopy of semiconducting polymers

Sebastian Albert-Seifried and Richard H. Friend

Appl. Phys. Lett. 98, 223304 (2011); http://dx.doi.org/10.1063/1.3595340 (3 pages) | Cited 6 times

Online Publication Date: 2 June 2011

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We analyze the transient absorption spectra of regioregular poly(3-hexylthiophene) films and find substantial response due to heating of the sample by the picosecond pump-pulse. The increased transmission at the onset of the absorption spectrum, caused by thermal blueshifting of the absorption, produces responses that have often been misinterpreted as arising from electronic excited states. We demonstrate that the use of a high thermal conductivity substrate such as sapphire allows thermal effects to be conveniently separated from electronic excited states.
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78.47.J- Ultrafast spectroscopy (<1 psec)
71.15.Qe Excited states: methodology
78.40.Me Organic compounds and polymers
78.66.Qn Polymers; organic compounds
81.40.Gh Other heat and thermomechanical treatments
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Elucidating the interplay between dark current coupling and open circuit voltage in organic photovoltaics

Patrick Erwin and Mark E. Thompson

Appl. Phys. Lett. 98, 223305 (2011); http://dx.doi.org/10.1063/1.3595679 (3 pages) | Cited 13 times

Online Publication Date: 3 June 2011

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A short series of alkyl substituted perylenediimides (PDIs) with varying steric bulk are used to demonstrate the relationship between molecular structure, materials properties, and performance characteristics in organic photovoltaics. Devices were made with the structure indium tin oxide/copper phthalocyanine (200 Å)/PDI (200 Å)/bathocuproine (100 Å)/aluminum (1000 Å). We found that PDIs with larger substituents produced higher open circuit voltages (VOC’s) despite the donor acceptor interface gap (ΔEDA) remaining unchanged. Additionally, series resistance was increased simultaneously with VOC the effect of reducing short circuit current, making the addition of steric bulk a tradeoff that needs to be balanced to optimize power conversion efficiency.
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88.40.H- Solar cells (photovoltaics)
88.40.jr Organic photovoltaics
73.50.Pz Photoconduction and photovoltaic effects
73.61.Ph Polymers; organic compounds
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Using the peak effect to pick the good organic couplers

Eran Katzir, Shira Yochelis, and Yossi Paltiel

Appl. Phys. Lett. 98, 223306 (2011); http://dx.doi.org/10.1063/1.3596434 (3 pages)

Online Publication Date: 3 June 2011

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Nanostructures are likely to become primary components of future electronic devices. Self assembled molecular electronics is a route to achieve this goal. One central issue in molecular electronics deals with charge transport across molecular elements. In this letter we present a hybrid system sensitive to the coupling and consequently to charge or energy transfer through organic molecules. Our system uses gold nanoparticles coupled through organic molecules layers to type II superconductor. We correlate the organic capping ligands of the gold nanoparticles with the vortices pinning efficiency. This sensitive phenomenon distinguishes between different organic molecules coupling efficiency.
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85.65.+h Molecular electronic devices
74.25.Wx Vortex pinning (includes mechanisms and flux creep)
74.70.-b Superconducting materials other than cuprates
85.35.-p Nanoelectronic devices
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