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(Substrate and pretreatment dependence of Cu nucleation by metal-organic chemical vapor deposition)  

Kwak, Sung-Kwan (Dept. of Electronics Engineering, Kyung Hee University)
Lee, Myoung-Jae (Dept. of Electronics Engineering, Kyung Hee University)
Kim, Dong-Sik (Dept. of Computer Engineering, Inha Technical College)
Kang, Chang-Soo (Dept. of Electronic Engineering, Yuhan College)
Chung, Kwan-Soo (Dept. of Electronics Engineering, Kyung Hee University)
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Abstract
The nucleation of copper(Cu) with (hfac)iu(VTMS) oganometallic precursor is investigated for Si, $Sio_2$, TiN, $W_2N$ substrates. As the deposition temperature is increased, the dominant growth mechanism is observed to change from the nucleation of Cu particles to the clustering of Cu nuclei around $180^{\ciec}C$, independent of the employed substrates. It is also observed that the cleaning of substrate surfaces with the diluted HF solution improves the selectivity of Cu nucleation between TiN and $Sio_2$ substrates. Dimethyldichlorosilane treatment is found to passivate the surface of TiN substrate, contrary to the generally accepted belief, when the TiN substrate is cleaned by $H_2O_2$ solution before the treatment.
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