Composition-property relationships in high-κ LaxZr1-xOy thin films from aqueous solution |
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Institution: | 1. School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi 16419, Republic of Korea;2. Department of Electronics Engineering, Konkuk University, Seoul 05029, Republic of Korea;3. School of Electronics and information Engineering, Korea Aerospace University, Goyang, Gyeonggi 10540, Republic of Korea |
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Abstract: | Miniaturization of microelectronic devices has reached a fundamental scaling limit; parasitic electron tunneling through the ultrathin gate dielectric has become a major obstacle to continued device performance. One method for overcoming this limitation is to replace SiO2 gate dielectrics with thicker high-κ metal oxides. La2O3 and ZrO2 are two such materials that have received significant interest, but low stability to post-anneal water absorption and low-crystallization temperatures, respectively, have limited their widespread use. We recently reported an aqueous, all-inorganic route to high-κ lanthanum zirconium oxide dielectric films (1/1 La/Zr), which mitigates the disadvantages of the binary oxides but maintains their high-κ properties. In this contribution, we vary the La/Zr ratio of the aqueous precursor to optimize the properties of the resulting films. We find that the La0.20Zr0.80Oy composition is optimal for providing a high dielectric constant (∼18.2 at 600 °C) while maintaining excellent film morphology and stability. 20% La was necessary to prevent crystallization up to 600 °C, but films with higher La content displayed diminished dielectric constants and decreased stability towards post-anneal water absorption. |
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Keywords: | Lanthanum zirconium oxide Aqueous solution deposition Spin-coating Thin films |
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