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Fundamental characteristics of non-mass separated ion beam deposition with RE sputter-type ion source  

Minoru Isshiki (동북대학 다원물질과학연구소)
Publication Information
Journal of the Korean Vacuum Society / v.12, no.2, 2003 , pp. 136-143 More about this Journal
Abstract
In this paper, high purity RF sputter-type ion source for non-mass separated ion beam deposition was evaluated. The fundamental characteristics of the ion source which is composed of an RF Cu coil and a high purity Cu target (99.9999 %) was studied, and the practical application of Cu thin films for ULSI metallization was discussed. The relationship between the DC target current and the DC target voltage at various RF power and Ar gas pressures was measured, and then preparation conditions for Cu thin films was described. As a result, it was found that the deposition conditions of the target voltage, the target current and the Ar pressure were optimized at -300 V, 240 W and 9 Pa, respectively. The resistivity of Cu films deposited at a bias voltage of -50 V showed a minimum value of 1.8 $\pm$ 0.1 $mu\Omega$cm, which is close to that of Cu bulk (1.67 $mu\Omega$cm).
Keywords
ion beam deposition; copper; resistivity;
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