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http://dx.doi.org/10.5012/bkcs.2010.31.9.2503

Growth and Characterization of Conducting ZnO Thin Films by Atomic Layer Deposition  

Min, Yo-Sep (Department of Chemical Engineering, Konkuk University)
An, Cheng-Jin (Department of Chemical Engineering, Konkuk University)
Kim, Seong-Keun (WCU Hybrid Materials Program, Department of Materials Science and Engineering and Inter-university Semiconductor Research Center, Seoul National University)
Song, Jae-Won (WCU Hybrid Materials Program, Department of Materials Science and Engineering and Inter-university Semiconductor Research Center, Seoul National University)
Hwang, Cheol-Seong (WCU Hybrid Materials Program, Department of Materials Science and Engineering and Inter-university Semiconductor Research Center, Seoul National University)
Publication Information
Bulletin of the Korean Chemical Society / v.31, no.9, 2010 , pp. 2503-2508 More about this Journal
Abstract
ZnO thin films were grown on Si or $SiO_2$/Si substrates, at growth temperatures ranging from 150 to $400^{\circ}C$, by atomic layer deposition (ALD) using diethylzinc and water. Despite the large band gap of 3.3 eV, the ALD ZnO films show high n-type conductivity, i.e. low resistivity in the order of $10^{-3}\;{\Omega}cm$. In order to understand the high conductivity of ALD ZnO films, the films were characterized with X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, elastic recoil detection, Rutherford backscattering, Photoluminescence, and Raman spectroscopy. In addition, the various analytical data of the ZnO films were compared with those of ZnO single crystal. According to our analytical data, metallic zinc plays an important role for the high conductivity in ALD ZnO films. Therefore when the metallic zinc was additionally oxidized with ozone by a modified ALD sequence, the resistivity of ZnO films could be adjusted in a range of $3.8{\times}10^{-3}\;{\sim}\;19.0\;{\Omega}cm$ depending on the exposure time of ozone.
Keywords
ZnO; Conducting; Atomic layer deposition; Thin film;
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