Effect of Annealing Temperature and Atmosphere to Surface Solid Phase Reaction of Sapphire Substrates and Spin-Coated Copper Nitrate Gel Films — Oak Academic Publishing
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Effect of Annealing Temperature and Atmosphere to Surface Solid Phase Reaction of Sapphire Substrates and Spin-Coated Copper Nitrate Gel Films
Faculty of Human Studies, Ishinomaki Senshu University, Ishinomaki, Japan
1 Faculty of Human Studies, Ishinomaki Senshu University, Ishinomaki, Japan
The solid-phase reaction of sapphire (Al2O3) substrates and spin-coated copper nitrate films was studied. X-ray diffraction analysis revealed that a CuO fraction was observed by annealing at temperatures higher than 800℃. In addition, crystalline CuAlO2 was formed at annealing temperatures in the range of 900℃ – 1000℃ by solid-phase reaction of the spin-coated films and sapphire substrate. Crystalline CuAlO2 was formed by annealing at 1000℃ for 5 - 10 h, and CuAl2O4 was formed by annealing at 1000℃ for 15 h. When annealing under N2 flow, Cu2O was observed rather than CuAlO2. For a sample annealed in air at 1000℃ for 5 h, X-ray photoelectron spectroscopy measurements at various depths from surface revealed that Cu2+ ions are located around the surface, which suggests that the CuO fraction is present near the surface while the CuAlO2 fraction is located at greater depths from the surface of the samples. The depth profile of the sample suggests that there is no pure CuAlO2 layer in the sample, but that crystalline CuAlO2 is present in the sample as a mixture with CuO and Al2O3.
Kawazoe, H., Yasukawa, M., Hyodo, H., Kurita, M., Yanagi, H. and Hosono, H. (1997) P-Type Electrical Conduction in Transparent Thin Films of CuAlO2. Nature (London), 389, 939-942. https://doi.org/10.1038/40087
Ueda, K., Hase, T., Yanagi, H., Kawazoe, H., Hosono, H., Ohta, H., Orita, M. and Hirano, M. (2001) Epitaxial Growth of Transparent p-Type Conducting CuGaO2 Thin Films on Sapphire (001) Substrates by Pulsed Laser Deposition. Journal of Applied Physics, 89, 1790-1793. https://doi.org/10.1063/1.1337587
Singh, M., Mehta, B.R., Varandari, D. and Singh, V.N. (2009) Electrical and Optical Properties of Sn Doped CuInO2 Thin Films: Conducting Atomic Force Microscopy and Spectroscopic Ellipsometry Studies. Journal of Applied Physics, 106, 053709. https://doi.org/10.1063/1.3211941
Toyoda, K., Hinogami, R., Miyata, N. and Aizawa, M. (2015) Calculated Descriptors of Catalytic Activity for Water Electrolysis Anode: Application to Delafossite Oxides. The Journal of Physical Chemistry C, 119, 6495-6501. https://doi.org/10.1021/jp5092398
Amrute, A.P., Larrazábal, G.O., Mondelli, and C., Pérez-Ramírez, J. (2013) CuCrO2 Delafossite: A Stable Copper Catalyst for Chlorine Production. Angewandte Chemie International Edition, 52, 9772-9775. https://doi.org/10.1002/anie.201304254
Thirumalairajan, S. and Mastelaro, V.R. (2016) A Novel Organic Pollutants Gas Sensing Material p-Type CuAlO2 Microsphere Constituted of Nanoparticles for Environmental Remediation. Sensors and Actuators B: Chemical, 223, 138-148. https://doi.org/10.1016/j.snb.2015.09.092
Simashkevich, A., Serban, D., Bruc, L., Curmei, N., Hinrichs, V. and Rusu, M. (2016) Indium Tin Oxide Thin-Films Prepared by Vapor Phase Pyrolysis for Efficient Silicon Based Solar Cells. Thin Solid Films, 610, 35-41. https://doi.org/10.1016/j.tsf.2016.04.047
Kumar, B., Gong, H. and Akkipeddi, R. (2005) Aluminum-Doped Zinc Oxide Films as Transparent Conductive Electrode for Organic Lightemitting Devices. Journal of Applied Physics, 98, 073703. https://doi.org/10.1063/1.2060957
Tonooka, K., Bando, H. and Aiura, Y. (2003) Photovoltaic Effect Observed in Transparent p-n Heterojunctions Based on Oxide Semicon-ductors. Thin Solid Films, 445, 327-331. https://doi.org/10.1016/S0040-6090(03)01177-5
Neumann-Spallart, M., Pai, S.P. and Pinto, R. (2007) PLD Growth of CuAlO2. Thin Solid Films, 515, 8641-8644. https://doi.org/10.1016/j.tsf.2007.03.109
Banerjee, A.N., Maity, R., Ghosh, P.K. and Chattopadhyay, K.K. (2005) Thermoelectric Properties and Electrical Characteristics of Sputterdeposited p-CuAlO2 Thin Films. Thin Solid Films, 474, 261-266. https://doi.org/10.1016/j.tsf.2004.08.117
Tsuboi, N., Moriya, T., Kobayashi, S., Shimizu, H., Kato, K. and Kaneko, F. (2008) Characterization of CuAlO2 Thin Films Prepared on Sapphire Substrates by Reactive Sputtering and Annealing. Japanese Journal of Applied Physics, 47, 592-595. https://doi.org/10.1143/JJAP.47.592
Su, C.T., Lee, H.Y. Wu., B.K. and Chern, M.Y. (2011) Characterization of CuAlO2 Thin Films Prepared on Sapphire Substrates by Reactive Sputtering and Annealing. Journal of Crystal Growth, 328, 25-29. https://doi.org/10.1016/j.jcrysgro.2011.06.012
Ehara, T., Iizaka, R., Abe, M., Abe, K. and Sato, T. (2017) Preparation of CuAlO2 Thin Films by Radio Frequency Magnetron Sputtering and the Effect of Sputtering on the Target Surface. Journal of Ceramic Science and Technology, 8, 7-12.
Gong, H., Wang, Y. and Luo, Y. (2000) Nanocrystalline p-Type Transparent Cu-Al-O Semiconductor Prepared by Chemical-Vapor Deposition with Cu(acac)2 and Al(acac)3 Precursors. Applied Physics Letters, 76, 3959-3961. https://doi.org/10.1063/1.126834
Cai, J. and Gong, H. (2005) The Influence of Cu/Al Ratio on Properties of Chemical-Vapor-Deposition Grown p-Type Cu-Al-O Transparent Semiconducting Films. Journal of Applied Physics, 98, Article ID: 033707. https://doi.org/10.1063/1.1997293
Shy, J.H. and Tseng, B.H. (2005) Characterization of CuAlO2 Thin Film Prepared by Rapid Thermal Annealing of an Al2O3/Cu2O/Sapphire Structure. Journal of Physics and Chemistry of Solids, 66, 2123-2126. https://doi.org/10.1016/j.jpcs.2005.09.062
Shih, C.H. and Tseng, B.H. (2012) Formation Mechanism of CuAlO2 Prepared by Rapid Thermal Annealing of Al2O3/Cu2O/Sapphire Sandwich Structure. Physics Procedia, 32, 395-400. https://doi.org/10.1016/j.phpro.2012.03.574
Kirupa, E.A., Raj, A.M.E. and Ravidhas, C. (2016) Influence of Substrate Temperature on Crystalline Copper Aluminium Oxide Thin Films Synthesized through Chemical Spray Pyrolysis (CSP) Technique. Journal of Materials Science: Materials in Electronics, 27, 8991-8995. https://doi.org/10.1007/s10854-016-4930-6
Ehara, T., Abe, H., Iizaka, R., Abe, K. and Sato, T. (2017) Crystalline Orientation Control in Sol-Gel Preparation of CuAlO2 Thin Films. Journal of Sol-Gel Science and Technology, 82, 363-369. https://doi.org/10.1007/s10971-017-4306-2
Ohashi, M., Iida, Y. and Morikawa, H. (2002) Preparation of CuAlO2 Films by Wet Chemical Synthesis. Journal of the American Ceramic Society, 85, 270-272. https://doi.org/10.1111/j.1151-2916.2002.tb00080.x
Gosh, C.K., Popuri, S.R., Mahesh, T.U. and Chattopadhyay, K.K. (2009) Preparation of Nanocrystalline CuAlO2 through Sol-Gel Route. Journal of Sol-Gel Science and Technology, 52, 75-81. https://doi.org/10.1007/s10971-009-1999-x
Liu, S.-J., Wang, H., Xu, J.-W., Ren, M.-F., Yang, L. and Ju, J.-H. (2011) Structure and Electrical Properties of CuAlO2 Thin Films Derived by Sol-Gel Processing. Journal of Materials Science: Materials in Electronics, 22, 666-671. https://doi.org/10.1007/s10854-010-0193-9
Gotzendorfer, S., Polenzky, C., Ulrich, S. and Lobmann, P. (2009) Preparation of CuAlO2 and CuCrO2 Thin Films by Sol-Gel Processing. Thin Solid Films, 518, 1153-1156. https://doi.org/10.1016/j.tsf.2009.02.153
Aemelao, L., Barreca, D., Bertapelle, M., Bottaro, G., Sada, C. and Tondello, E. (2003) A Sol-Gel Approach to Nanophasic Copper Oxide Thin Films. Thin Solid Films, 442, 48-52. https://doi.org/10.1016/S0040-6090(03)00940-4
Ray, S.C. (2001) Preparation of Copper Oxide Thin Film by the Sol-Gel Dip Technique and Study of Their Structural and Optical Properties. Solar Energy Materials and Solar Cells, 68, 307-312. https://doi.org/10.1016/S0927-0248(00)00364-0
Liu, S., Wu, Z., Zhang, Y., Yao, Z., Fan, J., Zhang, Y., Zhang, P. and Shao, G. (2015) Strong Temperature-Dependent Crystallization, Phase Transition, Optical and Electrical Characteristics of p-Type CuAlO2 Thin Films. Physical Chemistry Chemical Physics, 17, 557-562. https://doi.org/10.1039/C4CP04009K
Kim, D.-S. and Choi, S.-Y. (2005) Wet-Oxidation Effect on p-Type Transparent Conducting CuAlO2 Thin Film. Physica Status Solidi, 222, R167-R169.
Ghijsen, J., Tjeng, L.H., Van Elp, J., Eskes, H., Westerink, J., Sawatzky, G.A. and Czyzyk, M.T. (1988) Electronic Structure of Cu2O and CuO. Physical Review B, Condensed Matter and Materials Physics, 38, 11322-11330. https://doi.org/10.1103/PhysRevB.38.11322
Poulston, S., Parlett, P.M., Stone, P. and Bowker, M. (1996) Surface Oxidation and Reduction of CuO and Cu2O Studied Using XPS and XAES. Surface and Interface Analysis, 24, 811-820. https://doi.org/10.1002/(SICI)1096-9918(199611)24:12 3.0.CO;2-Z