Fabrication of thin film effect transistor comprising an organic semiconductor and chemical solution deposited metal oxide gate dielectric
First Claim
1. A thin film transistor device structure comprising:
- a substrate upon which a plurality of electrically conducting gate electrodes are disposed;
a layer of an inorganic gate insulator having a dielectric constant (.di-elect cons.) of at least 15 disposed on said electrodes;
a layer of an organic semiconductor disposed on said insulator and substantially overlapping the said molecules;
a plurality of sets of electrically conductive source and drain electrodes disposed on said organic semiconductor in alignment with each of said gate electrodes.
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Accused Products
Abstract
A thin film transistor (TFT) device structure based on an organic semiconductor material, that exhibits a high field effect mobility, high current modulation and a low sub-threshold slope at lower operating voltages than the current state of the art organic TFT devices. A fabrication process for the same, especially a process for deposition of the gate insulator using chemical solutions. The structure comprises a suitable substrate disposed with the following sequence of features: a set of conducting gate electrodes covered with a high dielectric constant insulator, a layer of the organic semiconductor, sets of electrically conducting source and drain electrodes corresponding to each of the gate lines, and an optional passivation layer that can overcoat and protect the device structure. Use of high dielectric constant gate insulators exploits the unexpected gate voltage dependence of the organic semiconductor to achieve high field effect mobility levels at very low operating voltages. Judicious combinations of the choice of this insulator material and the means to integrate it into the TFT structure are taught that would enable easy fabrication on glass or plastic substrates and the use of such devices in flat panel display applications.
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Citations
31 Claims
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1. A thin film transistor device structure comprising:
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a substrate upon which a plurality of electrically conducting gate electrodes are disposed; a layer of an inorganic gate insulator having a dielectric constant (.di-elect cons.) of at least 15 disposed on said electrodes; a layer of an organic semiconductor disposed on said insulator and substantially overlapping the said molecules; a plurality of sets of electrically conductive source and drain electrodes disposed on said organic semiconductor in alignment with each of said gate electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification