Effects of Ar Pressure and Substrate Temperature on Properties of Transparent and Conductive ZnO Thin Films Prepared by RF Sputtering.

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  • ＲＦスパッタリングによるＺｎＯ透明導電薄膜特性へのＡｒ圧力と基板温度の影響
  • RF スパッタリングニヨルZnO トウメイ ドウデン ハクマク トクセイ エ

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Abstract

Transparent conductive Al-doped ZnO thin films were prepared on glass substrates by using radio frequency (RF) diode sputtering equipment with pure Ar gas and an Al2O3-mixed ZnO ceramic target. The samples, with constant thickness of 0.5μm, were produced by changing Ar pressure, annealing temperature, and substrate temperature in sputtering. Their electrical and optical properties and adhesion force to glass substrates were evaluated. Transparent films had low resistivity of 2.7×10-3Ω·cm and infrared ray cutoff, obtained by optimum case of Ar pressure of 1.3Pa and the substrate temperature of 723K. The adhesion force of the films were 1.7GPa in shear stress, tested by the scratch method. Films sputtered at higher Ar pressure of 13Pa also showed low resistivity of 3.4×10-3Ω·cm and sufficient infrared ray cutoff without substrate heating, although they tinged yellow and had a low adhesion force of 0.6GPa. The low adhesion force of these films was improved by postannealing above 673K.

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