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Direct mapping of potential distribution of Al/poly(alkylthiophene)/Au diode
Keiichi Kaneto,Masahiro Nakagawa,Wataru Takashima 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
Potential profiles of an Al/poly(3-hexylthiophene), PHT film/Au diode through Al to Au electrodes have been measured directly using a micro-manipulator with a potential probe tip. A steep potential cliff is observed at the interface of Al/PHT for negative biases to Au against Al, indicating the existence of a depletion layer with higher resistance than that of the PHT bulk region. For a positive bias above +1 V to Au, the interface resistance at Al/PHT decreases markedly, resulting in a forward current in the rectification diode. It is found that the contact resistance of PHT/Au is unexpectedly large in spite of the ohmic behavior. The effect of light on the depletion layer is also studied. It is stressed that the contact resistances of PHT and metals are significantly important and determine the performance of organic electronic devices.
Keiichi Kaneto,Tomokazu Sendai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Electrochemomechanical strain (ECMS) under tensile stresses up to 5 MPa in polypyrrole films doped with dodecylbenzene sulfonate (PPy/DBS) has been studied in aqueous LiCl electrolytes. The ECMS of about 2% showed cation driven behavior and decreased with increasing the tensile stress. At higher tensile stresses, a nonlinear deformation against the injected charges was observed, as well as creeping associated with conformation change, slipping and/or breaking of polymer chains. After the removal of high tensile stresses, the creeping was recovered to some extent. The results were discussed in terms of the relaxation of anisotropic strain and memory effect introduced during the creeping. The conversion efficiency from electrical to mechanical energies was 0.04 % being the maximum at around 3 MPa.
KoichiRikitake,ShyamS.Pandey,WataruTakashima,KeiichiKaneto 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Currentvoltage (IV) characteristics of regioregular (headtail) poly(3-hexylthiophene), HT-PHT lms in the sandwich cellstructure of Al/HT-PHT/Au have been studied as a function of temperature. The cells showed typical rectication characteristics withthe ratio of more than 103dependence ofIV characteristics at the forward biases are discussed with the bulk property of the HT-PHT. The reversed current anditscharacteristicsare discussed takingthe thermionicemissionand iusion models athe junctionsofAl/HT-PHTintoconsideration.. 2002 Elsevier Science B.V. All rights reserved.
Photovoltaic properties in poly(3-alkylthiophene) based heterojunction cells
ShyamS.Pandey,KoichiRikitake,WataruTakashima,KeiichiKaneto 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Photocarrier generation and photovoltaic eect have been systematically studied in single layer ITO/poly(3-alkylthioph-ene)(P3AT)/Al Schottky and double layer ITO/P3AT/perylene/metal heterojunction cells. It has been found that Ohmic contactformation takes place between ITO (Au) with P3AT and Au (Ag, Al) with perylene derivatives. The double layer organic het-erojunction device shows strong rectifying behavior with the rectication ratio of 1000 (at. 2 V) and the ideality factor of 2.15. Themaximum incident photon to electron conversion eciency (IPCE) of 0.08% was found for the devices fabricated using regioregularjunction cell IPCE was more than an order of magnitude higher than that of the single layer junction of regioregular P3BT/Al.. 2002 Elsevier Science B.V. All rights reserved.