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21 Jun 2010

Volume 96, Issue 25, Articles (25xxxx)

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Appl. Phys. Lett. 96, 251901 (2010); http://dx.doi.org/10.1063/1.3455157 (3 pages)

Yongsam Kim, Ankit S. Disa, Timur E. Babakol, and Joel D. Brock
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Current bistability and carrier transport mechanisms of organic bistable devices based on hybrid Ag nanoparticle-polymethyl methacrylate polymer nanocomposites

Won Tae Kim, Jae Hun Jung, Tae Whan Kim, and Dong Ick Son

Appl. Phys. Lett. 96, 253301 (2010); http://dx.doi.org/10.1063/1.3453661 (3 pages) | Cited 10 times

Online Publication Date: 21 June 2010

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The current bistability and the carrier transport mechanisms of organic bistable devices (OBDs) using Ag nanoparticle-polymethyl methacrylate (PMMA) nanocomposites have been investigated. Current-voltage measurements at 300 K on the Al/Ag nanoparticles embedded in the PMMA layer/indium-tin-oxide devices exhibit a current bistability with an ON/OFF ratio of 103. Write-read-erase-read sequence results demonstrate the switching characteristics of the OBD. The cycling endurance number of the ON/OFF switching for the OBD is above 7×104. The current bistability and carrier transport mechanisms of the OBD fabricated utilizing hybrid Ag nanoparticle-PMMA polymer nanocomposites are described on the basis of the experimental data.
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85.35.-p Nanoelectronic devices
73.40.-c Electronic transport in interface structures
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Enhanced photorefractive performance in CdSe quantum-dot-dispersed poly(styrene-co-acrylonitrile) polymers

Xiangping Li, Joel van Embden, James W. M. Chon, Richard A. Evans, and Min Gu

Appl. Phys. Lett. 96, 253302 (2010); http://dx.doi.org/10.1063/1.3454780 (3 pages) | Cited 3 times

Online Publication Date: 21 June 2010

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This paper reports on the enhanced photorefractive behavior of a CdSe quantum-dot-dispersed less expensive polymer of poly(styrene-co-acrylonitrile). The capability of CdSe quantum dots used as photosensitizers and the associated photorefractive performance are characterized through a photocurrent experiment and a two-beam coupling experiment, respectively. An enhanced two-beam coupling gain coefficient of 12.2 cm−1 at 46 V/μm was observed owning to the reduced potential barrier. The photorefractive performance per CdSe quantum dot is three orders of magnitude higher than that in the sample sensitized by trinitrofluorenone in poly(styrene-co-acrylonitrile), and almost ten times higher than that in the CdSe quantum-dot-sensitized poly(N-vinylcarbazole) polymers.
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78.20.Mg Photorefractive effects
42.70.Gi Light-sensitive materials
72.40.+w Photoconduction and photovoltaic effects
78.56.-a Photoconduction and photovoltaic effects
82.50.-m Photochemistry
79.60.-i Photoemission and photoelectron spectra
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Determining the absorption tolerance of single chromophore photodiodes for machine vision

R. Jansen van Vuuren, K. D. Johnstone, S. Ratnasingam, H. Barcena, P. C. Deakin, A. K. Pandey, P. L. Burn, S. Collins, and I. D. W. Samuel

Appl. Phys. Lett. 96, 253303 (2010); http://dx.doi.org/10.1063/1.3456374 (3 pages) | Cited 4 times

Online Publication Date: 24 June 2010

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Color information is much less useful to machine vision systems than to people because the spectrum of light illuminating a scene is unknown. For scenes illuminated by daylight, color information can be made significantly more useful to machine vision systems if the scene is imaged using sensors with a specifically chosen combination of spectral responses. In this paper we show that detectors with a full width at half maximum of up to 100 nm can give good color discrimination, and that conjugated dendrimer chromophores have the spectral properties required to allow machine vision systems to confidently use color information.
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42.30.Tz Computer vision; robotic vision
42.30.Sy Pattern recognition
85.60.Gz Photodetectors (including infrared and CCD detectors)
85.60.Dw Photodiodes; phototransistors; photoresistors
42.79.Pw Imaging detectors and sensors
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Improved thermoelectric performance of organic thin-film elements utilizing a bilayer structure of pentacene and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ)

Kentaro Harada, Mao Sumino, Chihaya Adachi, Saburo Tanaka, and Koji Miyazaki

Appl. Phys. Lett. 96, 253304 (2010); http://dx.doi.org/10.1063/1.3456394 (3 pages) | Cited 10 times

Online Publication Date: 24 June 2010

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We demonstrate an improved thermoelectric performance of small molecular thin films fabricated by thermal deposition of pentacene as a p-type conduction layer. To enhance the performance, a bilayer structure composed of an intrinsic pentacene layer and an acceptor 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane layer is utilized as the prototype thermoelectric element. With the bilayer structure, the electrical conductivity reaches 0.43 S/cm, exhibiting a positive Seebeck coefficient of about 200 μV/K. We thus obtain a high power factor of 2.0 μW/mK2 with an optimized layer thickness.
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73.50.Lw Thermoelectric effects
72.20.Pa Thermoelectric and thermomagnetic effects
73.61.Ng Insulators
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