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5 Nov 2012

Volume 101, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 101, 193101 (2012); http://dx.doi.org/10.1063/1.4764508 (4 pages)

Ryan T. Tucker, Allan L. Beaudry, Joshua M. LaForge, Michael T. Taschuk, and Michael J. Brett
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Surface relief grating in azo-polymer obtained for s-s polarization configuration of the writing beams

Anna Sobolewska and Stanislaw Bartkiewicz

Appl. Phys. Lett. 101, 193301 (2012); http://dx.doi.org/10.1063/1.4764950 (4 pages)

Online Publication Date: 5 November 2012

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The paper reports on the formation of the surface relief gratings in thin films of the azobenzene-functionalized polymer. We evidence that the efficiency of the formation process of the surface relief gratings strongly depends on the length of the main polymer chains in the case of the s-s configuration. The explanation of this relationship is given and is based on the revealing of the differences in the ability of the motion of the main chain which is strictly related to its length.
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42.79.Dj Gratings
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
42.70.Jk Polymers and organics
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Highly efficient indium tin oxide-free organic photovoltaics using inkjet-printed silver nanoparticle current collecting grids

M. Neophytou, F. Hermerschmidt, A. Savva, E. Georgiou, and S. A. Choulis

Appl. Phys. Lett. 101, 193302 (2012); http://dx.doi.org/10.1063/1.4765343 (4 pages)

Online Publication Date: 5 November 2012

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We report an in-depth investigation of an inkjet-printed silver (Ag) nanoparticle grid combined with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) of different conductivities as an alternative to an indium tin oxide (ITO)-based transparent anode for organic solar cell applications. The reported measurements revealed higher transparency of the inkjet-printed Ag nanoparticle-based grid when compared to different thicknesses of ITO on glass substrates. Based on the proposed current collecting grid, a record power conversion efficiency of 2% is achieved for ITO-free organic solar cells.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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The role of cesium carbonate on the electron injection and transport enhancement in organic layer by admittance spectroscopy

Jin Zhao, Yong Cai, Jin-Peng Yang, Huai-Xin Wei, Yan-Hong Deng, Yan-Qing Li, Shuit-Tong Lee, and Jian-Xin Tang

Appl. Phys. Lett. 101, 193303 (2012); http://dx.doi.org/10.1063/1.4766174 (4 pages) | Cited 2 times

Online Publication Date: 6 November 2012

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The effect of cesium carbonate (Cs2CO3) doping on the electron transport properties of 4,7-diphenyl-1, 10-phenanthroline (BPhen) layer has been investigated in organic light-emitting diodes (OLEDs). Temperature-dependent admittance spectroscopy studies show that the incorporation of Cs2CO3 from 0 to 42 wt. % can decrease the activation energy of the BPhen layer from 1.3 to 0.18 eV, resulting in the enhanced electron injection and transport with respect to reduced injection barrier and increased conductivity of the BPhen layer. This is consistent with the performance improvement in OLEDs, which yields better electrical characteristics and enhanced luminance efficiency.
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85.60.Jb Light-emitting devices
61.72.up Other materials
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High-speed solution-processed organic single crystal transistors using a novel triisopropylsilylethynyl anthracene derivative

Dae Sung Chung, Tae Kyu An, Chan Eon Park, Hui-Jun Yun, Soon-Ki Kwon, and Yun-Hi Kim

Appl. Phys. Lett. 101, 193304 (2012); http://dx.doi.org/10.1063/1.4764062 (4 pages) | Cited 1 time

Online Publication Date: 6 November 2012

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A high-quality organic single crystal transistor (OSCT) was fabricated via solution-processing using a novel anthracene derivative (TIPsAntNE). The OSCT fabricated on a surface-modified high-capacitance ZrOx substrate provided a transistor that operated at low voltages with a high mobility up to 4.1 cm2/Vs and negligible hysteresis (a Vth shift of <20 mV). Importantly, the TIPsAntNE OSCT functioned under a high-frequency AC signal with a gate bias as high as 30 kHz. These are crucial operational requirements for commercial applications of organic transistors. The photoresponsivity (>1 A/W) of the TIPsAntNE single crystal was high over a wide range across the visible spectrum.
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85.30.Tv Field effect devices
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Electrophoretic deposition onto an insulator for thin film preparation toward electronic device fabrication

Shougo Miyajima, Shuichi Nagamatsu, Shyam S. Pandey, Shuzi Hayase, Keiichi Kaneto, and Wataru Takashima

Appl. Phys. Lett. 101, 193305 (2012); http://dx.doi.org/10.1063/1.4766126 (4 pages)

Online Publication Date: 7 November 2012

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An electrostatic film fabrication method utilizing the dielectric layer, entitled dielectric barrier electrophoretic deposition (DBEPD) has been proposed. We demonstrated the fabrication of uniform organic semiconductor thin film onto any kind of substrate by DBEPD. Optical absorption spectra of colloidal poly(3-hexylthiophene) (P3HT) film prepared by DBEPD exhibited the clear vibrational structure attributed to highly ordered domains. It was in contrast to the relatively disordered structure as shown in the case of P3HT film prepared by conventional electrophoretic deposition (EPD). Organic field effect transistors fabricated by each method showed similar organic field effect transistor characteristics, however, the uniformity of DBEPD film was superior to EPD film.
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81.15.Pq Electrodeposition, electroplating
85.30.Tv Field effect devices
68.55.ag Semiconductors
78.30.Jw Organic compounds, polymers
78.40.Me Organic compounds and polymers
78.66.Qn Polymers; organic compounds
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Towards the development of a virtual organic solar cell: An experimental and dynamic Monte Carlo study of the role of charge blocking layers and active layer thickness

K. Feron, C. J. Fell, L. J. Rozanski, B. B. Gong, N. Nicolaidis, W. J. Belcher, X. Zhou, E. Sesa, B. V. King, and P. C. Dastoor

Appl. Phys. Lett. 101, 193306 (2012); http://dx.doi.org/10.1063/1.4767291 (5 pages)

Online Publication Date: 8 November 2012

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Monte Carlo (MC) simulations have been used to fully model organic solar cells. The quantum efficiency and short-circuit current of these virtual devices are in excellent agreement with experimental measurements. Simulations show that, contrary to expectation, indium tin oxide/poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate)/poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methylester (PCBM)/aluminium devices lack effective charge blocking layers at the electrode interfaces. X-ray photoelectron spectroscopy depth profiling shows that despite a PCBM-rich region near the cathode, interface intermixing at the electrodes combined with incomplete PCBM coverage leads to significant interface recombination. This work highlights the effectiveness of MC simulations as a predictive tool and emphasizes the need to control electrode interface processes.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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Optimization of surface morphology to reduce the effect of grain boundaries and contact resistance in small molecule based thin film transistors

Sarita Yadav, Pramod Kumar, and Subhasis Ghosh

Appl. Phys. Lett. 101, 193307 (2012); http://dx.doi.org/10.1063/1.4766913 (4 pages) | Cited 1 time

Online Publication Date: 9 November 2012

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Grain boundaries in organic thin film have been controlled by engineering the different growth conditions in such a way that it reduces the contact resistance and enhances the carrier mobility in p-type copper phthalocyanine and n-type copper hexadecafluoro phthalocyanine based organic thin film transistors. Reduced effect of grain boundary has been demonstrated by temperature dependence of charge carrier mobility and other transport parameters. A correlation has been established between contact resistance and certain thin film morphology, achieved by varying different growth conditions.
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85.30.Tv Field effect devices
02.60.Pn Numerical optimization
73.40.Cg Contact resistance, contact potential
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