電界を印加したPLD法で作製した酸化亜鉛系透明導電膜

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  • Transparent Conducting ZnO Films Prepared by PLD in Electric Field
  • デンカイ オ インカ シタ PLDホウ デ サクセイ シタ サンカ アエンケイ トウメイ ドウデン マク

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Approximately 150 nm-thick Al-doped zinc oxide (AZO) films with c-axis orientation have been prepared on glass substrates by pulsed laser deposition (PLD) using a split target divided into AZO(Al2O3 : 1 wt.%) and AZO(Al2O3 : 2 wt.%), which resulted in the adjustment of film composition by changing the ratio (trace ratio) of the time required to irradiate each side of the target alternately by an ArF excimer laser (λ= 193 nm). The film deposition took place at a substrate temperature of 230 °C. The trace ratio of 1 : 1 was employed, resulting in the film component of AZO(Al2O3 : 1.5 wt.%). In order to improve the film flatness, D.C. voltage of 150 V was applied perpendicularly to the plume generated between the substrate and the target. As a results, fluctuation of film-thickness improved from 7.8 % for the case without applied voltage to 4.7 %, with applied voltage of 150 V. For the AZO film deposited by irradiating a pulsed laser beam of energy density of 1 J/cm2 at repetition frequency of 10 Hz, the lowest resistivity was 2.47×10-4 Ω·cm for the case without applied voltage and 2.59×10-4 Ω·cm with applied voltage of 150 V. An average transmittance of more than 85 % in the visible range were obtained for the AZO films fabricated with and without D.C. voltage of 150 V applied perpendicularly to the plume, providing useful functionality as TCO films in the visible range.

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