Equivalent Circuit of Organic Field-effect Transistors with Interface States

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  • 界面準位を考慮した有機電界効果トランジスタの等価回路
  • カイメン ジュンイ オ コウリョ シタ ユウキ デンカイ コウカ トランジスタ ノ トウカ カイロ

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<p>Transfer characteristics and complex impedance spectra of organic field effect transistors (OFETs) using poly (3-hexylthiophene-2, 5-diyl) (P3HT) have been measured before and after exposure to laboratory atmosphere. Although the transfer characteristics were not changed after the exposure to laboratory atmosphere, a new structure was found in the complex modulus spectra below 10 Hz, calculated from the complex impedance spectra. Since it is likely that the structure is due to interface state created by atmospheric exposure, an equivalent circuit of OFET considering the interface state was proposed. The complex modulus was derived from the equivalent circuit and was in good agreement with the experimental results. It has been demonstrated that information concerning the interface states as well as the field-effect mobility, the resistivity of the gate dielectrics, and the contact resistance was obtained by means of impedance spectroscopy measurement of OFETs.</p>

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