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26 Mar 2012

Volume 100, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 100, 133701 (2012); http://dx.doi.org/10.1063/1.3696019 (3 pages)

Hewei Liu, Feng Chen, Qing Yang, Pubo Qu, Shengguan He, Xianhua Wang, Jinhai Si, and Xun Hou
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Very low bias stress in n-type organic single-crystal transistors

M. Barra, F. V. Di Girolamo, N. A. Minder, I. Gutiérrez Lezama, Z. Chen, A. Facchetti, A. F. Morpurgo, and A. Cassinese

Appl. Phys. Lett. 100, 133301 (2012); http://dx.doi.org/10.1063/1.3698341 (4 pages) | Cited 5 times

Online Publication Date: 26 March 2012

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Bias stress effects in n-channel organic field-effect transistors (OFETs) are investigated using N,N′-bis(n-alkyl)-(1,7 and 1,6)-dicyanoperylene-3,4:9,10-bis(dicarboximide)s (PDIF-CN2) single-crystal devices with Cytop gate dielectric, both under vacuum and in ambient. We find that the amount of bias stress is very small as compared to all (p-channel) OFETs reported in the literature. Stressing the PDIF-CN2 devices by applying 80 V to the gate for up to a week results in a decrease of the source drain current of only ∼1% under vacuum and ∼10% in air. This remarkable stability of the devices leads to characteristic time constants τ, extracted by fitting the data with a stretched exponential—that are τ ∼ 2 × 109 s in air and τ ∼ 5 × 109 s in vacuum—approximately two orders of magnitude larger than the best values reported previously for p-channel OFETs.
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85.30.Tv Field effect devices
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Efficient broad-spectrum parallel tandem organic solar cells based on the highly crystalline chloroaluminum phthalocyanine films as the planar layer

Weichao Chen, Xiaolan Qiao, Jianbing Yang, Bo Yu, and Donghang Yan

Appl. Phys. Lett. 100, 133302 (2012); http://dx.doi.org/10.1063/1.3697397 (4 pages)

Online Publication Date: 26 March 2012

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Efficient parallel tandem organic solar cells are demonstrated by using the highly crystalline chloroaluminum phthalocyanine (AlClPc) films as the planar layer. Their broad photoresponse from 400–900 nm is contributed to the strong near-infrared absorption of the AlClPc films and the good complementarity between AlClPc and zinc phthalocyanine. Importantly, the high external quantum efficiency is obtained in the entire response range with the peak value 65% due to the high carrier mobility of the AlClPc films, and correspondingly the high power conversion efficiency of 3.5% is attributed to the large short circuit current density of 12.15 mA/cm2.
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88.40.jr Organic photovoltaics
72.20.Ee Mobility edges; hopping transport
88.40.hj Efficiency and performance of solar cells
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Efficiency enhancement in dye sensitized solar cells through co-sensitization of TiO2 nanocrystalline electrodes

Vibha Saxena, P. Veerender, A. K. Chauhan, P. Jha, D. K. Aswal, and S. K. Gupta

Appl. Phys. Lett. 100, 133303 (2012); http://dx.doi.org/10.1063/1.3697987 (4 pages) | Cited 2 times

Online Publication Date: 27 March 2012

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We have demonstrated that co-sensitization of TiO2 electrode with an inexpensive rhodamine 19 perchlorate laser dye along with N3 dye not only enhances the incident-photon-to-current conversion efficiency but also reduces dark current. Consequently, the devices yield an average power efficiency of 4.7% as against 2.3% and 0.6% obtained for N3 and rhodamine 19 perchlorate dye based devices, respectively. The improvement in efficiency is attributed to the enhanced dye absorption on TiO2 electrode as well as reduced dye aggregation that resulted from the usage of two dyes on different anchoring sites of single TiO2 electrode.
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88.40.J- Types of solar cells
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Multilayered graphene anode for blue phosphorescent organic light emitting diodes

Joohyun Hwang, Hong Kyw Choi, Jaehyun Moon, Taek Yong Kim, Jin-Wook Shin, Chul Woong Joo, Jun-Han Han, Doo-Hee Cho, Jin Woo Huh, Sung-Yool Choi, Jeong-Ik Lee, and Hye Yong Chu

Appl. Phys. Lett. 100, 133304 (2012); http://dx.doi.org/10.1063/1.3697639 (4 pages) | Cited 2 times

Online Publication Date: 27 March 2012

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In this work, we report on blue organic light emitting devices (OLEDs), which have multilayered graphene as its anode. Our graphene films have been grown catalytically and transferred to the support. The fabricated blue OLEDs with graphene anode showed outstanding external quantum efficiency of 15.6% and power efficiency of 24.1 lm/W at 1000 cd/m2. Weak oxygen plasma treatments on graphene film surfaces improved the injection property between the anode and hole injection layer.
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85.60.Jb Light-emitting devices
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Two-photon-pumped optical gain in dye-polymer composite materials

Wei Li, Chunfeng Zhang, Qi Chen, Xiaoyong Wang, and Min Xiao

Appl. Phys. Lett. 100, 133305 (2012); http://dx.doi.org/10.1063/1.3697706 (4 pages)

Online Publication Date: 27 March 2012

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Optical gain with two-photon pumping has been quantitatively characterized in the energy-transfer-coupled dye-polymer composite materials. Using femtosecond transient absorption spectroscopy, we observed frequency up-converted optical amplification in the dye-doped polymer films. Net optical gain coefficient in the polymer films with optimized doping is evaluated to be about 25 cm−1 by the variable-stripe-length measurements, which induces spectral narrowing of emission with linewidth changing from 42 nm to 9 nm. The intrinsic mechanisms for the optical gain in such composite system have been assigned to the amplified spontaneous emission and superfluorescence at relatively low and high excitation regimes, respectively.
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78.66.Qn Polymers; organic compounds
78.45.+h Stimulated emission
78.55.Kz Solid organic materials
78.47.jb Transient absorption
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Highly transparent polymer light-emitting diode using modified aluminum-doped zinc oxide top electrode

Sung Heum Park, Byoung Hoon Lee, Jong Moon Shin, Se-Young Jeong, Suhee Song, Hongsuk Suh, and Kwanghee Lee

Appl. Phys. Lett. 100, 133306 (2012); http://dx.doi.org/10.1063/1.3698340 (4 pages) | Cited 1 time

Online Publication Date: 29 March 2012

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We report a novel approach that leads to a significant improvement in the performance of transparent polymer light-emitting diodes (TPLEDs). By introducing a solution-based titanium oxide (TiOx) layer, we have demonstrated that the device performance of TPLEDs using aluminum-doped zinc oxide (AZO) top electrodes is enhanced. The TiOx layer lowers the energy barrier between the luminescent polymer and the AZO top electrode by modifying the WF of the top AZO electrodes. Moreover, the TiOx layer prevents the damage caused by UV radiation and by highly energetic ions generated during the AZO sputtering.
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85.60.Jb Light-emitting devices
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