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Fabrication of UV photo-detector based on coral reef like p-NiO/n-ZnO nanocomposite structures
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
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.
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2013 (English)In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 108, 149-152 p.Article in journal (Refereed) Published
Abstract [en]

In this research work, a UV photo-detector is fabricated on fluorine doped tin oxide (FTO) glass substrate by exploiting the advantageous features of p-n heterojunctions based on p-NiO and n-ZnO composite nanostructures forming a coral-reef like structures. Scanning electron microscopy (SEM) and X-ray diffraction results showed uniform morphology and good crystal quality of the synthesised nanostructures respectively. I-V measurements have shown nonlinear and rectifying response of the p-NiO/n-ZnO heterojunction. The proposed photodiode exhibited excellent UV response with acceptable photocurrent generation of about 3.4 mA and the responsivity of 2.27 A/W at -3 biasing voltage.

Place, publisher, year, edition, pages
Elsevier , 2013. Vol. 108, 149-152 p.
Keyword [en]
p-NiO/n-ZnO composite nanostructures, Photodiode, UV-visible spectrophotometry
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-99403DOI: 10.1016/j.matlet.2013.06.083ISI: 000324562900038OAI: diva2:656918
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2014-04-04
In thesis
1. The synthesis, characterization and device fabrication of ZnO, NiO and their composite nanostructures
Open this publication in new window or tab >>The synthesis, characterization and device fabrication of ZnO, NiO and their composite nanostructures
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electronics industry has been revolutionized since last few decades because of the fabrication of electronic devices by using nanoscale based materials. But the more innovative feature in the electronic devices is the use of transparent materials, which makes the transparent electronic devices as one of the most interesting research field in nanoscience and nano-technology now a days. In order to have high performance electronic devices based on the wide band gap compound semiconductors, a selection of right transparent material is crucial step. Among all the transparent metal oxides, ZnO is one of the potential candidates due to the ease in the synthesis process, wide bandgap of 3.37 eV, a high exciton binding energy of 60 meV and diverse morphologies. Since p-type ZnO based nanodevices are still difficult to fabricate due to the instability and unreliability of p-type ZnO nanomaterial, therefore several p-type semiconductors are used for the development of p-n junctions. Among those NiO is suitable p-type compound semiconductor to make p-n junction with ZnO because of its wide band gap of 3.7 eV and environment friendly conditions for its synthesis. Keeping these attractive properties of n-type ZnO and p-type NiO, the synthesis of composite nanostructures of these two transparent oxides and fabrication of their electronic devices is presented in this dissertation work.

I started my work with the synthesis of ZnO nanostructures focusing on the effect of different anions of zinc salts on the morphology and crystallinity of ZnO nanostructures. Then I grow honey-comb like NiO nanostructures on 3D nickel foam and used these nanostructures for the detection of Zinc ion. After that synthesized NiO and ZnO based composite nanostructures and characterized them, having main focus on the luminescence properties of ZnO when decorated with NiO nanostructures. The composite nanostructures of p-type NiO and n-type ZnO showed enhancement in the luminescence properties. Since pn junction is the back bone of electronic devices so working on the designing of band alignment along with the current transport properties of p-type NiO/n-type ZnO composite structures, an attempt was put forwarded to explain the phenomenon of these compound semiconducting materials. Different devices based on these two compound semiconducting materials are fabricated and designed in the present dissertation work, however still more work is required to improve the efficiency of devices like LEDs and UV detectors.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 55 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1562
Zinc oxide; Nickel Oxide; Composite nanostructures; Wide band gap; Low temperature growth; Luminescence, Photo-detector; Light emitting diode
National Category
Natural Sciences
urn:nbn:se:liu:diva-103343 (URN)
Public defence
2014-01-24, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:00 (English)
Available from: 2014-01-17 Created: 2014-01-17 Last updated: 2014-09-18Bibliographically approved

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