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7 Feb 2011

Volume 98, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 98, 063101 (2011); http://dx.doi.org/10.1063/1.3551574 (3 pages)

Y. Z. He, H. Li, P. C. Si, Y. F. Li, H. Q. Yu, X. Q. Zhang, F. Ding, K. M. Liew, and X. F. Liu
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Imbalanced mobilities causing S-shaped IV curves in planar heterojunction organic solar cells

Wolfgang Tress, Annette Petrich, Markus Hummert, Moritz Hein, Karl Leo, and Moritz Riede

Appl. Phys. Lett. 98, 063301 (2011); http://dx.doi.org/10.1063/1.3553764 (3 pages) | Cited 20 times

Online Publication Date: 8 February 2011

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We show that S-kinks in the current voltage characteristics, which decrease the fill factor significantly, can be caused by a strong imbalance of charge carrier mobilities (hole mobility in donor and electron mobility in acceptor) in planar/flat heterojunction organic solar cells. Electrical simulations according to a drift-diffusion model predict the occurrence of an S-kink for a mobility mismatch factor larger than 100. By combining a low-mobility donor material, (1,2,3,4,9,10,11,12-octaphenyl-diindeno[1,2,3-cd:1′,2′,3′-lm]perylene), with the acceptors C60 and N,N′-dimethylperylene-3,4:9,10-dicarboximide, which show different electron mobilities, we experimentally verify the predictions. Our results demonstrate that not only interface effects but also the photoactive material itself can cause S-kinks.
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88.40.jr Organic photovoltaics
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Bias and temperature dependent charge transport in solution-processed small molecular mixed single layer organic light emitting devices

Zhaokui Wang, Yanhui Lou, Shigeki Naka, and Hiroyuki Okada

Appl. Phys. Lett. 98, 063302 (2011); http://dx.doi.org/10.1063/1.3554391 (3 pages) | Cited 3 times

Online Publication Date: 9 February 2011

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The authors investigate bias and temperature dependent current density-voltage (J-V) characteristics in solution-processed small molecular mixed single layer organic light emitting devices using Au/MoO3 as hole and Al as electron injection electrode. Hole and electron injections are primarily ascribed to the Schottky thermionic emission mechanism. However, at high field of >9×105 V cm−1, hole transport is found to be bulk trapped corresponding to space charge limited current with an exponential distribution of traps. The bulk trap density, about 1018 cm−3 in mixed organic layer, is evaluated by the differential method.
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85.60.Jb Light-emitting devices
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Organic semiconductor memory devices based on a low-band gap polyfluorene derivative with isoindigo as electron-trapping moieties

Xinjun Xu, Lidong Li, Bo Liu, and Yingping Zou

Appl. Phys. Lett. 98, 063303 (2011); http://dx.doi.org/10.1063/1.3554756 (3 pages) | Cited 5 times

Online Publication Date: 9 February 2011

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Polyfluorene and its derivatives are good candidates to fabricate single-component polymer memories. However, the reported polyfluorenes for use in memories all have a big band gap and exhibit an absorption peak near the ultraviolet region. We report here organic memories based on a low-band gap polyfluorene derivative with isoindigo as electron-trapping moieties to improve on/off ratios. Also, possible factors which may influence the performance of polymer memory devices are investigated and feasible approaches for improving device performance are provided.
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85.30.-z Semiconductor devices
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Air-mediated self-organization of polymer semiconductors for high-performance solution-processable organic transistors

Takashi Kushida, Takashi Nagase, and Hiroyoshi Naito

Appl. Phys. Lett. 98, 063304 (2011); http://dx.doi.org/10.1063/1.3553481 (3 pages) | Cited 2 times

Online Publication Date: 9 February 2011

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Air-mediated molecular ordering in the self-organized polymer semiconductor of regioregular poly(3-hexylthiophene) (P3HT) is investigated using organic field-effect transistors (OFETs) fabricated by microcontact printing using poly(dimethylsiloxane) stamps having varying surface energy. OFET measurements reveal a large difference between the P3HT thin film microstructure at the interface with air and that at the interface with the substrate and efficient charge transport through the former. These results indicate that the formation of a highly ordered microstructure at the P3HT/air interface through air-mediated self-organization is little affected by substrate-mediated molecular ordering at the other interface of the P3HT film.
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81.05.Fb Organic semiconductors
85.30.Tv Field effect devices
81.16.Nd Micro- and nanolithography
81.16.Dn Self-assembly
68.55.-a Thin film structure and morphology
68.35.Md Surface thermodynamics, surface energies
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Photoluminescence enhancement and quenching in metal-semiconductor quantum dot hybrid arrays

M. Haridas, L. N. Tripathi, and J. K. Basu

Appl. Phys. Lett. 98, 063305 (2011); http://dx.doi.org/10.1063/1.3553766 (3 pages) | Cited 10 times

Online Publication Date: 10 February 2011

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Hybrid monolayer arrays of metal and semiconductor quantum dots have been prepared to study the exciton-plasmon interaction. We observed crossover from strong quenching to enhancement in photoluminescence of the quantum dots as a function of the emission wavelength for fixed interparticle spacings. Remarkably, the enhancement is observed even for extremely short separation at which strong quenching has been observed and predicted earlier. A significant redshift in emission maxima is also observed for quantum dots with quenched emission. The possible role of collective phenomena as well as strong interactions in such ordered hybrid arrays in controlling the emission is discussed.
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78.55.Hx Other solid inorganic materials
78.66.-w Optical properties of specific thin films
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
71.35.-y Excitons and related phenomena
81.40.Gh Other heat and thermomechanical treatments
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Achieving high efficiency laminated polymer solar cell with interfacial modified metallic electrode and pressure induced crystallization

Yongbo Yuan, Yu Bi, and Jinsong Huang

Appl. Phys. Lett. 98, 063306 (2011); http://dx.doi.org/10.1063/1.3554377 (3 pages) | Cited 4 times

Online Publication Date: 11 February 2011

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We report efficient laminated organic photovoltaic device with efficiency approach the optimized device by regular method based on Poly(3-hexylthiophene-2,5-diyl) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The high efficiency is mainly attributed to the formation of a concrete polymer/metal interface mechanically and electrically by the use of electronic-glue, and using the highly conductive and flexible silver film as anode to reduce photovoltage loss and modifying its work function for efficiency hole extraction by ultraviolet/ozone treatment, and the pressure induced crystallization of PCBM.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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Photoinduced magnetoresistance in organic field-effect transistors

Thomas Reichert and Tobat P. I. Saragi

Appl. Phys. Lett. 98, 063307 (2011); http://dx.doi.org/10.1063/1.3554388 (3 pages) | Cited 8 times

Online Publication Date: 11 February 2011

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We report on negative magnetoresistance (MR) of −0.46% in low external magnetic fields in pentacene field-effect transistors. This effect can only be observed if the device is irradiated. MR strongly depends on gate voltage but is independent of drain voltage. Furthermore, the MR increases as the intensity of irradiation increases and the relationship of both parameters is not linear. The dependency of MR on magnetic field is not linear either, but it follows non-Lorentzian line shape. The triplet exciton-charge reaction model is a possible explanation for negative MR in irradiated pentacene field-effect transistors.
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85.30.Tv Field effect devices
85.70.Ec Magnetostrictive, magnetoacoustic, and magnetostatic devices
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