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16 May 2011

Volume 98, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 98, 201101 (2011); http://dx.doi.org/10.1063/1.3590716 (3 pages)

Martynas Beresna, Mindaugas Gecevičius, Peter G. Kazansky, and Titas Gertus
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Fast ambipolar integrated circuits with poly(diketopyrrolopyrrole- terthiophene)

W. S. C. Roelofs, S. G. J. Mathijssen, J. C. Bijleveld, D. Raiteri, T. C. T. Geuns, M. Kemerink, E. Cantatore, R. A. J. Janssen, and D. M. de Leeuw

Appl. Phys. Lett. 98, 203301 (2011); http://dx.doi.org/10.1063/1.3589986 (3 pages) | Cited 1 time

Online Publication Date: 17 May 2011

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Ambipolar integrated circuits were prepared with poly(diketopyrrolopyrrole-terthiophene) as the semiconductor. The field-effect mobility of around 0.02 cm2/V s for both electrons and holes allowed for fabrication of functional integrated complementary metal-oxide semiconductor (CMOS)-like inverters and ring oscillators. The oscillation frequency was found to have a near quadratic dependence on the supply bias. The maximum oscillation frequency was determined to be 42 kHz, which makes this ring oscillator the fastest CMOS-like organic circuit reported to date.
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85.30.Tv Field effect devices
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Nonvolatile memory effect of a functional polyimide containing ferrocene as the electroactive moiety

Guofeng Tian, Shengli Qi, Fei Chen, Lei Shi, Wenping Hu, and Dezhen Wu

Appl. Phys. Lett. 98, 203302 (2011); http://dx.doi.org/10.1063/1.3592575 (3 pages)

Online Publication Date: 18 May 2011

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A functional polyimide, hexafluoroisopropyl bis(phthalic dianhydride)/4-(bis(4-aminophenyl) methyl)phenol grafted with ferrocene, was synthesized. Electrical characterization results indicate that the sandwiched devices using our synthesized polyimide as the active layer possess electrical bistability and exhibit nonvolatile memory behavior with an ON/OFF current ratio of about 103. Molecular orbitals and electronic properties are investigated by molecular simulation and cyclic voltammetry characterization. The charge transfer mechanisms in the OFF and ON states of the memory device were reasonably interpreted by using the thermionic emission and space-charge-limited-current model, respectively.
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84.30.Sk Pulse and digital circuits
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Interfacial energy level bending in a crystalline p/p-type organic heterostructure

Feng Zhu, Mandy Grobosch, Uwe Treske, Martin Knupfer, Lizhen Huang, Shiliang Ji, and Donghang Yan

Appl. Phys. Lett. 98, 203303 (2011); http://dx.doi.org/10.1063/1.3592994 (3 pages)

Online Publication Date: 19 May 2011

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A conduction channel was observed at the heterointerface of the crystalline p-type organic films copper phthalocyanine (CuPc) and 2,5-bis(4-biphenylyl) bithiophene (BP2T). Energy level bending at the interface is confirmed by photoemission spectroscopy, which verifies a charge transfer between CuPc and BP2T. This provides a further route to utilize interfacial electronic properties in functional devices and also documents the importance of reconsidering the interfacial electronic structure of organic heterostructures.
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73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
82.30.Fi Ion-molecule, ion-ion, and charge-transfer reactions
68.35.Ct Interface structure and roughness
65.40.gp Surface energy
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Enhanced stability of zinc oxide-based hybrid polymer solar cells by manipulating ultraviolet light distribution in the active layer

Shuyan Shao, Jian Liu, Baohua Zhang, Zhiyuan Xie, and Lixiang Wang

Appl. Phys. Lett. 98, 203304 (2011); http://dx.doi.org/10.1063/1.3593020 (3 pages) | Cited 1 time

Online Publication Date: 20 May 2011

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Polymer solar cells based on blends of conjugated polymer and zinc oxide (ZnO) nanoparticles degrade very fast under simulated solar light illumination due to the considerably increased photoconductivity of ZnO upon ultraviolet light exposure. It is reported that the stability of hybrid polymer solar cells with ZnO as electron acceptors is improved by using an optical layer to decrease ultraviolet light distribution inside the active layer. The power conversion efficiency of control solar cell drops to 0.3% of its original value after 10 min simulated solar light exposure while that of the cell with optimized optical layer is maintained at 87.1%.
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88.40.hj Efficiency and performance of solar cells
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