The self bias voltages of the target in RF sputtering were measured, and a method of controlling self bias voltages is proposed to lower the resistivity of ITO films.
Using this method, the resistivities of the ITO films on glass at 200°C prepared by RF magnetron sputtering of a 98.6%density target under the total pressure 1.3 Pa of Ar containing 0.03%O
2 partial pressure ratio were 1.9×10
-4 Ω·cm uniformly on the glass. The values of the self bias of the target in RF sputtering were found that they are changed by the total pressure, the distance between the target and the glass and so on. And the reason for the change is explained.
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