Frequency response analysis of pentacene thin-film transistors with low impedance contact by interface molecular doping

被引：49

作者：

Miyadera, Tetsuhiko ^{[1
]}

Minari, Takeo

Tsukagoshi, Kazuhito

Ito, Hiromi

Aoyagi, Yoshinobu

机构：

[1] RIKEN, Wako, Saitama 3510198, Japan

[2] JST, CREST, Kawaguchi, Saitama 3320012, Japan

[3] RIKEN, Wako, Saitama 3510198, Japan

[4] Tokyo Tech, Yokohama, Kanagawa 2268502, Japan

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 01期

关键词：

D O I：

10.1063/1.2754350

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Frequency response measurements were performed on top-contact pentacene organic thin-film transistors (OTFTs). The ac characteristics of OTFTs are strongly limited by the contact interface between a metallic electrode and a pentacene thin film. Local doping of a charge transfer molecule (CTM) into the contact interface efficiently improves the ac characteristics. Metal-insulator-semiconductor capacitance measurements revealed that the interface contains parasitic impedance composed of capacitance and resistance in parallel. The parasitic impedance was suppressed by CTM doping of the interface. The limitation factors for the frequency of operation in such an OTFT are discussed based on the experimental results and an equivalent circuit model. (C) 2007 American Institute of Physics.

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