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29 Jun 2009

Volume 94, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 94, 263501 (2009); http://dx.doi.org/10.1063/1.3136905 (3 pages)

Changxin Chen, Wei Zhang, Eric Siu-Wai Kong, and Yafei Zhang
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Measuring the profile of the emission zone in polymeric organic light-emitting diodes

Malte C. Gather, Michael Flämmich, Norbert Danz, Dirk Michaelis, and Klaus Meerholz

Appl. Phys. Lett. 94, 263301 (2009); http://dx.doi.org/10.1063/1.3159836 (3 pages) | Cited 16 times

Online Publication Date: 30 June 2009

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The profile of the emission zone (PEZ) in the emissive layer (EML) of polymeric organic light-emitting diodes (OLEDs) is determined by fitting the measured electroluminescence spectrum of the device with a series of simulated spectra that correspond to different emitter locations. The studied OLEDs are based on two different blue-emitting conjugated polymers. In one case, the PEZ is confined to a 10 nm thin sheet at the anode indicating electron dominated current in the EML. In OLEDs based on the other emitter, the PEZ spreads over the entire EML.
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85.60.Jb Light-emitting devices
85.60.Bt Optoelectronic device characterization, design, and modeling
78.60.Fi Electroluminescence
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Trimethylamine biosensor based on pentacene enzymatic organic field effect transistor

A. K. Diallo, J. Tardy, Z. Q. Zhang, F. Bessueille, N. Jaffrezic-Renault, and M. Lemiti

Appl. Phys. Lett. 94, 263302 (2009); http://dx.doi.org/10.1063/1.3167805 (3 pages) | Cited 4 times

Online Publication Date: 2 July 2009

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This paper reports on an enzymatic organic field effect transistor based biosensor dedicated to the detection of trimethylamine, in view of fish freshness assessment. Flexible devices were processed on Kapton substrate with pentacene as organic semiconductor and Parylene-C as top gate dielectric. Proton sensitive dielectric surface was achieved by depositing a thin hydrogenated silicon nitride layer at moderate temperature on Parylene. An enzymatic membrane made of flavin-containing mono-oxygenase 3 cross-linked with bovine serum albumin deposited on silicon nitride completed the realization of the device. High sensitivity trimethylamine biosensing was demonstrated in the 0–8 ppm range.
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85.30.Tv Field effect devices
87.85.-d Biomedical engineering
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The effect of dielectric constant on device mobilities of high-performance, flexible organic field effect transistors

H. S. Tan, N. Mathews, T. Cahyadi, F. R. Zhu, and S. G. Mhaisalkar

Appl. Phys. Lett. 94, 263303 (2009); http://dx.doi.org/10.1063/1.3168523 (3 pages) | Cited 28 times

Online Publication Date: 2 July 2009

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High-performance pentacene (μsat = 6.3 cm2/V s) and poly(3-hexylthiophene) (μsat = 0.43 cm2/V s) field effect transistors have been realized on flexible substrate with low operating voltage (<−5 V), utilizing a trilayer sol-gel silica gate dielectric. Furthermore, the permittivity of the dielectric was tuned from ∼ 7 to ∼ 10 by varying plasma treatments, allowing the study of charge carrier mobility variation with k. A 65% reduction in the saturation mobility of the devices was observed when k increases, suggesting that the energetic disorder at the interface between the active layer and the dielectric can be modulated by the high polarizability of the bulk dielectric.
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85.30.Tv Field effect devices
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