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
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