[Paper] Initial Stage Growth during Plasma Enhanced Atomic Layer Deposition of Cobalt




Initial Stage Growth during Plasma Enhanced Atomic Layer Deposition of Cobalt, Han-Bo-Ram Lee, Yong Jun Park, Sunggi Baik, and Hyungjun Kim, Chemical Vapor Deposition, 2012


http://dx.doi.org/10.1002/cvde.201106937


Abstract


The initial growth of Co thin films during plasma-enhanced atomic layer deposition (PE-ALD) is investigated by atomic force microscopy (AFM), scanning electron microscopy (SEM), and synchrotron radiation X-ray reflectivity (SR-XRR). For the PE- ALD of Co, CoCp2 andNH3 plasma were used as precursor and reactant, respectively. FromXRR simulation, the growth rate at the initial stage of growth did not linearly increase with growth cycles, showing deviation from ideal ALD growth. The low density of PE-ALD-produced Co film up to 100 cycles is observed from XRR and confirmed by AFM and SEM results. The growth behavior of Co is explained by island growth under substrate-inhibited growth mode.