Ambipolar organic thin-film field-effect transistor and making method
First Claim
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1. A method for preparing an ambipolar organic thin-film field-effect transistor, comprising the steps of:
- applying a solution of an organic solvent-soluble organic compound in an organic solvent onto a gate electrode,drying the applied solution to form an insulator layer,laying a semiconductor layer on the insulator layer, andconducting polling by applying a voltage which is not less than the coercive electric field and not more than the withstand voltage of the organic compound of the insulator layer between source and gate electrodes thereby inverting polarity from p-type transistor characteristics to n-type transistor characteristics.
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Abstract
In a thin-film field-effect transistor having metal/insulator/semiconductor (MIS) structure, the semiconductor layer is formed of an organic compound, and the insulator layer is formed of an organic compound which is soluble in an organic solvent and exhibits spontaneous polarization similar to ferroelectric material. The transistor exhibits n-type transistor characteristics when polling is conducted by applying a voltage which is not less than a coercive electric field and not more than a withstand voltage between source and gate electrodes, and absent polling, the transistor exhibits p-type transistor characteristics.
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Citations
17 Claims
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1. A method for preparing an ambipolar organic thin-film field-effect transistor, comprising the steps of:
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applying a solution of an organic solvent-soluble organic compound in an organic solvent onto a gate electrode, drying the applied solution to form an insulator layer, laying a semiconductor layer on the insulator layer, and conducting polling by applying a voltage which is not less than the coercive electric field and not more than the withstand voltage of the organic compound of the insulator layer between source and gate electrodes thereby inverting polarity from p-type transistor characteristics to n-type transistor characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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7. A method for preparing an ambipolar organic thin-film field-effect transistor, comprising the steps of:
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applying a solution of an organic solvent-soluble organic compound in an organic solvent onto a gate electrode, drying the applied solution to form an insulator layer, and laying a semiconductor layer on the insulator layer, said organic compound of which the insulator layer is made having a withstand voltage of at least 1 MV/cm, a coercive electric field of at least 50 kV/cm, and a spontaneous polarization Pr of at least 1.5 μ
C/cm2.
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Specification