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16 Apr 2012

Volume 100, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 100, 164101 (2012); http://dx.doi.org/10.1063/1.3702579 (4 pages)

Cheol-Ho Yun, Leslie Y. Yeo, James R. Friend, and Bernard Yan
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Organic memory device with polyaniline nanoparticles embedded as charging elements

Yo-Han Kim, Minkeun Kim, Sewook Oh, Hunsang Jung, Yejin Kim, Tae-Sik Yoon, Yong-Sang Kim, and Hyun Ho Lee

Appl. Phys. Lett. 100, 163301 (2012); http://dx.doi.org/10.1063/1.4704571 (4 pages) | Cited 4 times

Online Publication Date: 17 April 2012

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Polyaniline nanoparticles (PANI NPs) were synthesized and fabricated as charging elements for organic memory devices. The PANI NPs charging layer was self-assembled by epoxy-amine bonds between 3-glycidylpropyl trimethoxysilane functionalized dielectrics and PANI NPs. A memory window of 5.8 V (ΔVFB) represented by capacitance-voltage hysteresis was obtained for metal-pentacene-insulator-silicon capacitor. In addition, program/erase operations controlled by gate bias (−/+90 V) were demonstrated in the PANI NPs embedded pentacene thin film transistor device with polyvinylalcohol dielectric on flexible polyimide substrate. These results can be extended to development of fully organic-based electronic device.
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84.30.Sk Pulse and digital circuits
84.32.Tt Capacitors
85.30.Tv Field effect devices
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Rationalization of donor-acceptor ratio in bulk heterojunction solar cells using lateral photocurrent studies

Sabyasachi Mukhopadhyay and K. S. Narayan

Appl. Phys. Lett. 100, 163302 (2012); http://dx.doi.org/10.1063/1.4704654 (4 pages) | Cited 2 times

Online Publication Date: 17 April 2012

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A robust bicontinuous network for charge transport is a central requirement for efficient bulk heterojunction polymer solar cells. Factors affecting the network morphology include crystallinity and the relative concentration of the constituent materials. These factors are closely followed using a scanning approach which involves monitoring the photocurrent decay from the cathode-periphery in asymmetric device structures. The decay length correlates with the efficiency and the network connectivity of the ensuing microstructure.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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Obvious efficiency enhancement of organic light-emitting diodes by parylene-N buffer layer

Y. M. Hu, Y. He, X. Q. Chen, Y. Q. Zhan, Z. Y. Sun, Y. T. You, and X. Y. Hou

Appl. Phys. Lett. 100, 163303 (2012); http://dx.doi.org/10.1063/1.4704365 (4 pages) | Cited 1 time

Online Publication Date: 18 April 2012

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A parylene-N (PPXN) buffer layer inserted between anode and organic layers in typical organic light-emitting diodes (OLEDs) based on N, N′-bis(naphthalene-1-yl)-N, N′-bis(phenyl) benzidine (NPB) and tris (8-hydroxyquinolato) aluminum (Alq3) results in significant enhancement of the current efficiency. The enhancement can be 1.7 times higher compared to that of the buffer-free structure. Analyzing indicates that the buffer plays a role of blocking both the hole and electron current. Whether hole injection can be enhanced depends on electron accumulation at the buffer-organic interface. Inserting the PPXN buffer modifies carrier balance in the device, leading to the observed efficiency enhancement.
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85.60.Jb Light-emitting devices
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Highly efficient organic optoelectronic conversion induced by electric double layers in ionic liquids

Bo Li, Yukiko Noda, Laigui Hu, Hirofumi Yoshikawa, Michio M. Matsushita, and Kunio Awaga

Appl. Phys. Lett. 100, 163304 (2012); http://dx.doi.org/10.1063/1.3697988 (4 pages) | Cited 2 times

Online Publication Date: 19 April 2012

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In the present paper, highly efficient organic optoelectronic conversion has been demonstrated, induced by the electric double layers (EDLs) in ionic liquids. For the organic photocell, indium tin oxide/ionic liquid/charge-separation layer (zinc phthalocyanine:fullerene)/aluminum, in which the EDLs enhance the charge separation, a large photocurrent response can be generated. By this method, the internal quantum efficiency can reach 93% and a responsivity of 142 mA/W can be achieved. Since the EDLs show little dependence on the thickness of the ionic liquid, a very large photocurrent can be produced without the electrodes being superimposed along the light path.
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85.60.Bt Optoelectronic device characterization, design, and modeling
84.60.Jt Photoelectric conversion
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