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20 Apr 2009

Volume 94, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 94, 161105 (2009); http://dx.doi.org/10.1063/1.3119666 (3 pages)

Artur R. Davoyan, Ilya V. Shadrivov, Andrey A. Sukhorukov, and Yuri S. Kivshar
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Zinc oxide nanowire networks for macroelectronic devices

Husnu Emrah Unalan, Yan Zhang, Pritesh Hiralal, Sharvari Dalal, Daping Chu, Goki Eda, K. B. K. Teo, Manish Chhowalla, William I. Milne, and Gehan A. J. Amaratunga

Appl. Phys. Lett. 94, 163501 (2009); http://dx.doi.org/10.1063/1.3120561 (3 pages) | Cited 13 times

Online Publication Date: 20 April 2009

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Highly transparent zinc oxide (ZnO) nanowire networks have been used as the active material in thin film transistors (TFTs) and complementary inverter devices. A systematic study on a range of networks of variable density and TFT channel length was performed. ZnO nanowire networks provide a less lithographically intense alternative to individual nanowire devices, are always semiconducting, and yield significantly higher mobilites than those achieved from currently used amorphous Si and organic TFTs. These results suggest that ZnO nanowire networks could be ideal for inexpensive large area electronics.
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85.30.Tv Field effect devices
85.40.Hp Lithography, masks and pattern transfer

Tailoring the hydraulic impedance of out-of-plane micromachined electrospray sources with integrated electrodes

R. Krpoun, K. L. Smith, J. P. W. Stark, and H. R. Shea

Appl. Phys. Lett. 94, 163502 (2009); http://dx.doi.org/10.1063/1.3117191 (3 pages) | Cited 2 times

Online Publication Date: 21 April 2009

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Hydraulic impedance is a critical parameter for the operation of electrospray emitters, and for preventing flooding when spraying from arrays of emitters. Controlling flow rate by tuning the flow impedance allows accessing different operating modes, such as droplet, ionic, or pulsating. We report on a method to tailor the hydraulic impedance of micromachined capillary out-of-plane emitters with integrated extractor electrodes by filling them with silica microspheres. Spraying the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4), we demonstrate the ability to tune from droplet emission to pure ion emission depending on microbead diameter, obtaining stable emission from single emitters and from arrays of 19 emitters.
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47.61.-k Micro- and nano- scale flow phenomena
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.55.D- Drops and bubbles
47.55.nb Capillary and thermocapillary flows

Inkjet printing narrow electrodes with <50 μm line width and channel length for organic thin-film transistors

Jason Doggart, Yiliang Wu, and Shiping Zhu

Appl. Phys. Lett. 94, 163503 (2009); http://dx.doi.org/10.1063/1.3115830 (3 pages) | Cited 13 times

Online Publication Date: 21 April 2009

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We demonstrate a strategy for inkjet printing high resolution silver electrodes from silver precursor composition for organic thin-film transistors. Line width, channel length, and film uniformity of printed electrodes were investigated as functions of dot-to-dot spacing, solvent composition, and ink viscosity. Both line width and film uniformity were greatly improved by simultaneously optimizing dot-to-dot spacing and solvent composition. Line width and channel length were also significantly decreased by increasing ink viscosity. Source and drain electrodes with both width and channel length of less than 50 μm and near-perfect film uniformity were printed and integrated with poly(3,3‴-didodecylquarter-thiophene) semiconductor as high-performance transistors.
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85.30.Tv Field effect devices

Twist defect in an imprinted cholesteric elastomer

P. Castro-Garay, J. Adrian Reyes, and A. Corella-Madueño

Appl. Phys. Lett. 94, 163504 (2009); http://dx.doi.org/10.1063/1.3120549 (3 pages) | Cited 4 times

Online Publication Date: 22 April 2009

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We have found that a chiral twist defect inserted in a cholesteric elastomer gives rise to circularly polarized localized modes of both handedness. This defect enhances the resonant mode amplitude whose handedness is opposite to that of the cholesteric helix for high cross-linked density, whereas for low cross-linked density, the same mode is decoupled with the defect and thus the resonant mode disappears. Finally, the resonant mode of the same handedness as the elastomer helix is maintained for both high and low cross-linked density.
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61.30.Jf Defects in liquid crystals
61.30.Vx Polymer liquid crystals
61.41.+e Polymers, elastomers, and plastics

Gate-controlled nonvolatile graphene-ferroelectric memory

Yi Zheng, Guang-Xin Ni, Chee-Tat Toh, Ming-Gang Zeng, Shu-Ting Chen, Kui Yao, and Barbaros Özyilmaz

Appl. Phys. Lett. 94, 163505 (2009); http://dx.doi.org/10.1063/1.3119215 (3 pages) | Cited 43 times

Online Publication Date: 22 April 2009

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In this letter, we demonstrate a nonvolatile memory device in a graphene field-effect-transistor structure using ferroelectric gating. The binary information, i.e., “1” and “0”, is represented by the high and low resistance states of the graphene working channels and is switched by controlling the polarization of the ferroelectric thin film using gate voltage sweep. A nonvolatile resistance change exceeding 200% is achieved in our graphene-ferroelectric hybrid devices. The experimental observations are explained by the electrostatic doping of graphene by electric dipoles at the ferroelectric/graphene interface.
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85.50.Gk Non-volatile ferroelectric memories
84.30.Sk Pulse and digital circuits

Mechanism of gas breakdown near Paschen’s minimum in electrodes with one-dimensional nanostructures

Zhongyu Hou, Bingchu Cai, and Hai Liu

Appl. Phys. Lett. 94, 163506 (2009); http://dx.doi.org/10.1063/1.3123170 (3 pages) | Cited 3 times

Online Publication Date: 22 April 2009

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The mechanism of the gaseous breakdown in the electrode system with one-dimensional (1D) nanomaterial film is investigated. The hypothesis is suggested that the functionality of the 1D nanostructures in the breakdown is the averaged flux-convergence-effect of multiple nanoelectrodes to the electric field distribution, which leads to a convergence band model for discharge modeling. Theoretical deductions are examined by experiments in air and N2 at pressures (p) near the Paschen’s minimum with gap sizes (d) of ∼ 335 μm and pd range of 0.01–1 Torr cm. It is suggested that the increased efficiency of the secondary processes and the discharge’s lateral spreading may characterize the breakdown mechanism in electrodes with 1D nanostructures.
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51.50.+v Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
52.80.Hc Glow; corona
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