Current-Voltage Characteristics of Pentacene Films: Effect of UV/Ozone Treatment on Au Electrodes
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概要
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In relation to a metal/organic interface, the effect of an ozone treatment on the electrical properties of a metal surface was investigated by surface potential and current-voltage (I-V) measurements. With a UV/ozone treatment on a gold (Au) surface, the surface potential formed across a vacuum-evaporated pentacene film (100 nm thickness) on a Au substrate varied from $-200$ mV to 350 mV. The variation in the surface potential is possibly a result of a change in the apparent work function of the Au surface. The results obtained by photoemission spectroscopy support the deepening of the Fermi level of the Au surface with the UV/ozone treatment. The I-V characteristics of a [Au (top)/pentacene/Au (bottom)] structure showed that the rectifying property reverses with the UV/ozone treatment of the bottom Au electrode. These results are discussed based on the potential barrier at the Au/pentacene interface due to the space charge.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-01-15
著者
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Manaka Takaaki
Department Of Physical Electronics Graduate School Of Science And Engineering Tokyo Institute Of Tec
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Iwamoto Mitsumasa
Department Of Electrical And Electronic Engineering
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Suzue Yuuma
Department Of Physical Electronics Tokyo Institute Of Technology
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