بررسی خواص فیزیکی و اثر فوتورسانایی نانوساختارهای CuO تهیه شده به روش اکسایش حرارتی

نویسندگان

دانشکده فیزیک، دانشگاه صنعتی شاهرود، شهر شاهرود، استان سمنان

چکیده

لایه های نازک اکسید مس بر روی زیرلایه ITO با استفاده از روش اکسایش حرارتی تهیه شدند. نمونه ها توسط لایه‌ای از مس به روش رونشانی بخار فیزیکی PVD در دو حالت ساخته شدند: در غیاب و حضور لایه چسبنده بر روی زیرلایه. نمونه‌ها با استفاده از تصاویر FESEM، طیف‌سنجی‌های XRD و UV-Vis. مورد مشخصه-یابی قرار گرفتند. دریافتیم در حالی که سطح نمونه ی بدون لایه چسبنده از دانه‌هایی نانومتری پوشیده شده، اما نمونه ی دیگر با لایه ی چسبنده از دانه‌هایی متخلخل و برجسته همراه با ریزدانه‌هایی در حدود nm30 و یا کوچکتر پوشیده شده است. طیف‌های XRD نمونه‌ها حاکی از ساختار بس‌بلوری در فاز مونوکلینیک با جهتگیری‌های ترجیحی 111 و "" 1 ̅"11" می‌باشد. در بین این نمونه‌ها، نمونه ی با لایه چسبنده از شرایط فیزیکی مناسب‌تری ابعاد بلورکی بزرگتر، گاف نواری کوچکتر و جذب نوری بیشتر برخوردار است. سرانجام، اثرفوتورسانایی در ساختار فلز-نیمرسانا-فلز MSM با استفاده از لامپ LED قرمز مورد بررسی قرار گرفت.

کلیدواژه‌ها


عنوان مقاله [English]

An Investigation on the Physical Properties and Photoconductivity Effect of CuO Nanostructures Prepared by Thermal Oxidation Route

نویسندگان [English]

  • M. Jafari
  • H. Eshghi
Department of Physics, Shahrood University of Technology, Shahrood
چکیده [English]

Cupric oxide CuO thin films were synthesized on ITO substrate using thermal oxidation route. Samples were made using a Cu-layer deposited by PVD method in two cases: in the absence and presence of an adhesive oxide layer on the substrate. Samples were characterized by FESEM images, XRD and UV-Vis. spectra. We found that while the surface of the sample without adhesive layer is covered by nanograins, but sample with the adhesive layer is covered by rough nano-grains contained of very fine grains, about 30 nm or less. The XRD spectra of the samples indicated a polycrystalline structure in monoclinic phase with the main orientations of 111 and 1 ̅11. Among these samples, one with an adhesive layer has a better physical conditions i.e. bigger crystallite sizes, smaller band gap and higher optical absorbance. Finally, photoconductivity effect in metal-semiconductor-metal MSM structure was investigated using a red LED lamp.
 

کلیدواژه‌ها [English]

  • Cupric oxide (CuO)
  • Thermal oxidation
  • Nanostructure
  • Photoconductivity effect
[1]A. Rakhshani, “Preparation, characteristics and photovoltaic properties of cuprous oxide—a review,” Solid-State Electronics, 29, 7-17, 1986.
[2] B. Balamurugan and B. Mehta, “Optical and structural properties of nanocrystalline copper oxide thin films prepared by activated reactive evaporation,” Thin solid films, 396, 90-96, 2001.
[3] J. Ghijsen, L. Tjeng, J. Van Elp, H. Eskes, J. Westerink, G. Sawatzky, “Electronic structure of Cu2O and CuO,” Physical Review B, 38, 11322, 1988.
[4] Y. K. Jeong and G. M. Choi, “Nonstoichiometry and electrical conduction of CuO,” Journal of Physics and Chemistry of Solids, 57, 81-84, 1996.
[5] X. Zhao, P. Wang, Z. Yan, and N. Ren, “Room temperature photoluminescence properties of CuO nanowire arrays,” Optical Materials, 42, 544-547, 2015.
[6] M. Kaur, K. Muthe, S. Despande, S. Choudhury, J. Singh, N. Verma, “Growth and branching of CuO nanowires by thermal oxidation of copper,” Journal of Crystal Growth, 289, 670-675, 2006.
[7] H. Hsueh, T. Hsueh, S. Chang, T. Tsai, F. Hung, S. Chang, “CuO-nanowire field emitter prepared on glass substrate,” IEEE Transactions on Nanotechnology, 10, 1161-1165, 2011.
[8] D. AranaChavez, E. Toumayan, F. Lora, C. McCaslin, and R. A. Adomaitis, “Modeling the transport and reaction mechanisms of copper oxideCVD,” Chemical Vapor Deposition, 16, 336-345, 2010.
[9] Q. Yang, Z. Guo, X. Zhou, J. Zou, and S. Liang, “Ultrathin CuO nanowires grown by thermal oxidation of copper powders in air,”Materials Letters, 153, 128-131, 2015.
[10]V. Usha, S. Kalyanaraman, R. Thangavel, and R. Vettumperumal, “Effect of catalysts on the synthesis of CuO nanoparticles: Structural and optical properties by sol–gel method,”Superlattices and Microstructures, 86, 203-210, 2015.
[11]T. Kosugi and S. Kaneko, “Novel SprayPyrolysis deposition of cuprous oxide thin films,”Journal of the American Ceramic Society, 81, 3117-3124, 1998.
[12]J. C. Felizco and E. Magdaluyo Jr, “Formation of Hierarchical CuO Nanostructures onCopper Foil by Chemical Bath Deposition forApplications in Superhydrophobic Surfaces,” in MATEC Web of Conferences, 2016.
[13]C.-M. Tsai, G.-D. Chen, T.-C. Tseng, C.-Y. Lee, C.-T. Huang, W.-Y. Tsai, “CuO nanowire synthesis catalyzed by a CoWP nanofilter,” Acta Materialia, 57, 1570-1576, 2009.
[14]X. Jiang, T. Herricks, and Y. Xia, “CuO nanowires can be synthesized by heating copper substrates in air,” Nano Letters, 2, 1333-1338, 2002.
[15]K. M. Chahrour, N. M. Ahmed, M. Hashim,and A. M. Al-Diabat, “High Responsivity IR PhotodetectorBasedon CuONanorod Arrays/AAO Assembly,” Procedia Chemistry, 19,311-318, 2016.
[16]H. Kidowaki, T. Oku, T. Akiyama, A. Suzuki, B. Jeyadevan, and J. Cuya, “Fabrication and characterization of CuO-based solar cells,Journal of Materials Science Research, 1, 138, 2012.
[17]C. Zou, J. Wang, F. Liang, W. Xie, L.
Shao, and D. Fu, “Large-area aligned CuO nanowires arrays: Synthesis, anomalous ferromagnetic and CO gas sensing properties,” Current Applied Physics, 12, 1349-1354, 2012.
[18]C. Soci, A. Zhang, B. Xiang, S. A. Dayeh, D. Aplin, J. Park, “ZnO nanowire UV photodetectors with high internal gain,” Nano letters, 7, 1003-1009, 2007.
[19] H. Hsueh, T. Hsueh, S. Chang, F. Hung, T. Tsai, W. Weng, “CuO nanowire-based humidity sensors prepared on glass substrate, ” Sensors and Actuators B: Chemical, 156, 906-911, 2011.
[20]D.Gopalakrishna, K. Vijayalakshmi, and C. Ravidhas, “Effect of pyrolytic temperature on the properties of nano-structured Cuo optimized for ethanol sensing applications,” Journal of Materials Science: Materials in Electronics, 24, 1004-1011, 2013.
[21] M. Fox, “Optical Properties of Solids” Oxford University Press, 4, 2001.
[22]R.E. Marotti, P. Giorgi, G. Machado, E.A. Dalchiele, “Crystallite size dependence of band gap energy for electrodeposited ZnO grown at different temperatures” Solar Energy Materials & Solar Cells, 90, 2356–2361, 2006.
[23]S. Rehman, A. Mumtaz, and S. Hasanain,“Size effects on the magnetic and optical propertiesof CuO nanoparticles,” Journal of NanoparticleResearch, 13, 2497-2507, 2011.
[24]K. Borgohain and S. Mahamuni, “Formation of single-phase CuO quantum particles,” Journal of materials research, 17, 1220-1223, 2002.
[25]K. M. Chahrour, N. M. Ahmed, M.Hashim, N. G. Elfadill, and M. Bououdina, “Self-assembly of aligned CuO nanorod arrays using nanoporousanodicaluminatemplateby electrodeposition on Si substratefor IR photodetectors,”SensorsandActuatorsA: Physical, 239, 209-219, 2016