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Synthesis of CuO/ZnO Composite Nanostructures, Their Optical Characterization and Valence Band Offset Determination by X-Ray Photoelectron Spectroscopy
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
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2014 (English)In: Journal of Nanoelectronics and Optoelectronics, ISSN 1555-130X, E-ISSN 1555-1318, Vol. 9, no 3, 348-356 p.Article in journal (Refereed) Published
Abstract [en]

The study of the optical properties of zinc oxide (ZnO) nanorods and its composite nanostructures is an appealing issue in order to have highly efficient optoelectronic devices in the future. Zinc oxide, copper oxide (CuO) and their composite nanostructures were grown by the hydrothermal growth technique. The structural properties of the grown ZnO, CuO and their composite NSs were investigated by scanning electron microscopy and X-ray diffraction techniques. UV-visible spectroscopy, Cathodoluminescence and photoluminescence techniques were used for the study of optical properties of the as synthesized nanomaterials. X-ray photoelectron spectroscopy was used to measure the valence band offset of the CuO/ZnO composite nanostructures. Cathodoluminescence study of pure ZnO nanorods showed more insight for lateral luminescence compared to the top surface of the nanorods which opened a novel investigation in the area of optical properties of ZnO nanomaterial. While the room temperature cathodoluminescence spectra of CuO/ZnO composite nanostructures have demonstrated excellent luminescence in the UV region compared to the cathodoluminescence spectra observed at 4 K. The measured values for valence band offset and conduction band offset are found to be 2.83 eV and 0.73 eV, respectively for the prepared CuO/ZnO composite nanostructures. It was observed that CuO/ZnO composite nanostructures have type-II band alignment. The conclusion from both the cathodoluminescence and the photoluminescence studies showed that the luminescence in the visible region is only originated from the ZnO nanomaterial and that the CuO absorbs this visible emission as it covers the ZnO. This provides evidence suggesting that the use of CuO/ZnO in the fabrication of LEDs in the visible range is not appropriate.

Place, publisher, year, edition, pages
American Scientific Publishers , 2014. Vol. 9, no 3, 348-356 p.
Keyword [en]
CuO/ZnO Composite Nanostructures; Cathodoluminescence; Photoluminescence; Band Offset; X-Ray Photoelectron Spectroscopy
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-113479DOI: 10.1166/jno.2014.1594ISI: 000345612400005OAI: oai:DiVA.org:liu-113479DiVA: diva2:789045
Available from: 2015-02-17 Created: 2015-01-19 Last updated: 2017-12-04

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Hussain, MushtaqueIbupoto, Zafar HussainAbbassi, Mazhar AliKhan, AzamPozina, GaliaNur, OmerWillander, Magnus

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Hussain, MushtaqueIbupoto, Zafar HussainAbbassi, Mazhar AliKhan, AzamPozina, GaliaNur, OmerWillander, Magnus
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Department of Science and TechnologyThe Institute of TechnologyPhysics and ElectronicsThin Film Physics
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Journal of Nanoelectronics and Optoelectronics
Electrical Engineering, Electronic Engineering, Information EngineeringPhysical Sciences

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