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8 Mar 2010

Volume 96, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 96, 101501 (2010); http://dx.doi.org/10.1063/1.3352316 (3 pages)

Bomi Gweon, Daeyeon Kim, Dan Bee Kim, Heesoo Jung, Wonho Choe, and Jennifer H. Shin
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Characteristics of a pentacene thin film transistor with periodic groove patterned poly(methylmethacrylate) dielectrics

Qijun Sun, Ju-Hyung Kim, Jung-Hwan Park, and Soonmin Seo

Appl. Phys. Lett. 96, 103301 (2010); http://dx.doi.org/10.1063/1.3354020 (3 pages) | Cited 5 times

Online Publication Date: 8 March 2010

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Soft contact lamination enabled to assess the effects of angle variation of the periodic groove patterns on the same pentacene thin film transistors with a 140 nm periodic groove patterned dielectric layer. An angle was formed when the source-drain current and the groove direction of the dielectric layer were crossed. As the angle decreased from 90° to 0°, the current-output and carrier mobility increased and the threshold voltage of the device was shifted. Since pentacene molecules were oriented by the periodic groove patterns formed on the dielectric layer, the current-output and carrier mobility increased as the angle decreased.
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85.30.Tv Field effect devices
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
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Angular and prism coupling refractive enhancement in dye solar cells

Lorenzo Dominici, Luigi Vesce, Daniele Colonna, Francesco Michelotti, Thomas M. Brown, Andrea Reale, and Aldo Di Carlo

Appl. Phys. Lett. 96, 103302 (2010); http://dx.doi.org/10.1063/1.3328097 (3 pages) | Cited 5 times

Online Publication Date: 9 March 2010

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We quantify the strong dependence of photocurrent on the angle of incidence of light in a dye solar cell (DSC). Under laser illumination the photocurrent increases for large incidence angles. The enhancements are different upon using or not a coupling prism. They are explained with a model including three different angular factors. The observed enhancements up to 25% can be useful for evaluating novel designs of an efficient photon management in DSCs. Even an effective refractive index neff ≈ 2.0 for the mesoporous titania/electrolyte phase was retrieved from the angle dependent photocurrent.
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88.40.hj Efficiency and performance of solar cells
73.50.Pz Photoconduction and photovoltaic effects
42.79.Bh Lenses, prisms and mirrors
42.25.Gy Edge and boundary effects; reflection and refraction
88.40.jr Organic photovoltaics
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Electric field-modulated amplified spontaneous emission in waveguides based on poly [2-methoxy-5-(2′-ethylhexyloxy)-1, 4-phenylene vinylene]

Bo Zhang, Yanbing Hou, Feng Teng, Zhidong Lou, Xiaojun Liu, and Yongsheng Wang

Appl. Phys. Lett. 96, 103303 (2010); http://dx.doi.org/10.1063/1.3358117 (3 pages) | Cited 4 times

Online Publication Date: 11 March 2010

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We report amplified spontaneous emission (ASE) in an optically pumped symmetric thin film waveguide based on poly [2-methoxy-5-(2′-ethylhexyloxy)-1, 4-phenylene vinylene] (MEH-PPV) and electric-field modulation of the ASE in the MEH-PPV thin film. The electric-field quenching of the ASE at 620 nm and the spontaneous emission (SE) at 580 nm was observed, which increased with the electric field. The ASE intensity was more effectively quenched than the SE intensity as the field increased. The field dependence of the ASE and the SE intensity can be attributed to field-induced dissociation of photogenerated excitons in the MEH-PPV thin film.
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42.79.Gn Optical waveguides and couplers
42.79.Hp Optical processors, correlators, and modulators
78.20.Jq Electro-optical effects
71.35.-y Excitons and related phenomena
78.66.Qn Polymers; organic compounds
78.45.+h Stimulated emission
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Enhanced charge collection via nanoporous morphology in polymer solar cells

Hang Ken Lee, Ji Hye Jeon, Dong Hwan Wang, O. Ok Park, Jai-Kyung Kim, Sang Hyuk Im, and Jong Hyeok Park

Appl. Phys. Lett. 96, 103304 (2010); http://dx.doi.org/10.1063/1.3359425 (3 pages) | Cited 5 times

Online Publication Date: 11 March 2010

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We demonstrated a simple and nonlithographic method that enlarges the active layer/metal electrode contact area in polymer solar cells by adding the thermal initiator 2,2′-azobisisobutyronitrile (AIBN) as a nanohole generating agent. From diffused light spectra and x-ray diffraction measurements, it is found that device performance enhancement comes not from a change in the charge carrier generation or transportation characteristics but from increased charge carrier collection due to the reduced contact resistance and shortened pathway to the electrode caused by enlarged interface area.
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88.40.jr Organic photovoltaics
88.40.H- Solar cells (photovoltaics)
73.40.Cg Contact resistance, contact potential
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A study on the carrier injection mechanism of the bottom-contact pentacene thin film transistor

Keum-Dong Jung, Yoo Chul Kim, Hyungcheol Shin, Byung-Gook Park, Jong Duk Lee, Eou Sik Cho, and Sang Jik Kwon

Appl. Phys. Lett. 96, 103305 (2010); http://dx.doi.org/10.1063/1.3339877 (3 pages) | Cited 8 times

Online Publication Date: 11 March 2010

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For an analysis of the mechanism of carrier injection in the structure of bottom contact organic thin-film transistor (OTFT), Al blocking layer was applied to the source/drain electrode in variety of ways in the fabrication of bottom contact OTFT. From the comparison of the transfer characteristics of the OTFTs with different electrodes, it is obvious that the main direction of carrier injection is mainly dependent on the thickness of electrode. When the electrodes become thicker and thicker, the main carrier injection path is expected to be located at the side of the electrodes as well as the top of the electrodes.
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85.30.Tv Field effect devices
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Anomalous current transients in organic field-effect transistors

A. Sharma, S. G. J. Mathijssen, T. Cramer, M. Kemerink, D. M. de Leeuw, and P. A. Bobbert

Appl. Phys. Lett. 96, 103306 (2010); http://dx.doi.org/10.1063/1.3339879 (3 pages) | Cited 10 times

Online Publication Date: 11 March 2010

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Here we study the origin of the gate bias-stress effect in organic p-type transistors. Based on water-mediated exchange between holes in the semiconductor and protons in the gate dielectric, we predict anomalous current transients for a non-constant gate bias, while ensuring accumulation. When applying a strongly negative gate bias followed by a less negative bias a back-transfer of protons to holes and an increase of the current is expected. We verify this counterintuitive behavior experimentally and can quantitatively model the transients with the same parameters as used to describe the threshold voltage shift.
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85.30.Tv Field effect devices
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High-mobility bio-organic field effect transistors with photoreactive DNAs as gate insulators

Youn Sun Kim, Ki Hwa Jung, U Ra Lee, Kyung Hwan Kim, Mai Ha Hoang, Jung-Il Jin, and Dong Hoon Choi

Appl. Phys. Lett. 96, 103307 (2010); http://dx.doi.org/10.1063/1.3299022 (3 pages) | Cited 11 times

Online Publication Date: 11 March 2010

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Organic-soluble DNAs bearing chalcone moieties were synthesized by using purified natural sodium DNA. In addition to the chalcone-containing DNA homopolymer (CcDNA), a copolymer (CTMADNA-co-CcDNA) was synthesized. They were employed as gate insulators for fabricating organic thin-film transistors. An organic semiconductor (5,5′-(9,10-bis((4-hexylphenyl)ethynyl)anthracene-2,6-yl-diyl)bis(ethyne-2,1-diyl)bis(2-hexylthiophene; HB-ant-THT) was deposited on the photocrosslinked DNA-based gate insulators via a solution process. Interestingly, the resulting TFT devices had extremely high field-effect mobilities, and their corresponding transfer curves indicated low hysteresis. The carrier mobility of the device with HB-ant-THT deposited on the CTMADNA-co-CcDNA gate insulator was the best, i.e., 0.31 cm2 V−1 s−1 (Ion/Ioff = 1.0×104).
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85.30.Tv Field effect devices
81.05.Fb Organic semiconductors
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