화학공학소재연구정보센터
Journal of Vacuum Science & Technology A, Vol.25, No.4, 1172-1177, 2007
Transparent conducting Al-doped ZnO thin films prepared by magnetron sputtering with dc and rf powers applied in combination
A newly developed Al-doped ZnO (AZO) thin-film magnetron-sputtering deposition technique that decreases resistivity, improves resistivity distribution, and produces high-rate depositions has been demonstrated by dc magnetron-sputtering depositions that incorporate rf power (dc+rf-MS), either with or without the introduction of H-2 gas into the deposition chamber. The dc+rf-MS preparations were carried out in a pure Ar or an Ar+H-2 (0%-2%) gas atmosphere at a pressure of 0.4 Pa by adding a rf component (13.56 MHz) to a constant dc power of 80 W. The deposition rate in a dc+rf-MS deposition incorporating a rf power of 150 W was approximately 62 nm/min, an increase from the approximately 35 nm/ min observed in dc magnetron sputtering with a dc power of 80 W. A resistivity as low as 3 X 10(-4) Omega cm and an improved resistivity distribution could be obtained in AZO thin films deposited on substrates at a low temperature of 150 degrees C by dc+rf-MS with the introduction of hydrogen gas with a content of 1.5%. This article describes the effects of adding a rf power component (i.e., dc+rf-MS deposition) as well as introducing H-2 gas into dc magnetron-sputtering preparations of transparent conducting AZO thin films. (c) 2007 American Vacuum Society.