研究目的
Investigating the electrical stability of solution-processed indium oxide (In2O3) thin-film transistors (TFTs) in atmospheric air and under vacuum.
研究成果
The electrical stability of solution-processed In2O3 TFTs is significantly affected by electron-trapping at grain boundaries and electrostatic interactions with polar water molecules. Future research should focus on detrapping and relaxation behaviors of electrons under the influence of air molecules for reliable operation.
研究不足
The study highlights the electrical instability of solution-processed In2O3 TFTs due to electron-trapping at grain boundaries and interactions with polar water molecules, suggesting areas for further optimization in environmental stability.
1:Experimental Design and Method Selection:
The study involved the fabrication of bottom-gate/top-contact-structured In2O3 TFTs using a solution-based deposition process. The electrical stability was evaluated through consecutive TFT operation experiments under vacuum and atmospheric air conditions.
2:Sample Selection and Data Sources:
A p-doped silicon substrate with a 100-nm-thick silicon nitride (SiNx) dielectric layer was used. The In2O3 precursor solution was prepared from indium(III) nitrate hydrate dissolved in 2-methoxyethanol.
3:List of Experimental Equipment and Materials:
Equipment included a field-emission scanning electron microscope (FE-SEM), X-ray diffractometers (XRD), X-ray photoelectron spectroscope (XPS), and a semiconductor parameter analyzer. Materials included indium(III) nitrate hydrate, 2-methoxyethanol, and a p-doped silicon substrate.
4:Experimental Procedures and Operational Workflow:
The substrate was cleaned and treated with oxygen plasma. The In2O3 precursor solution was spin-coated, dried, and thermally annealed. Al source and drain electrodes were deposited, and the TFTs' electrical characteristics were measured.
5:Data Analysis Methods:
The morphological and structural properties of the In2O3 films were analyzed using FE-SEM and XRD. The chemical properties were analyzed using XPS. The electrical characteristics and stability were evaluated using a semiconductor parameter analyzer.
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