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The determination of valence band offset and the current transport properties of the p-NiO/n-ZnO heterojunction
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Ytors Fysik och Kemi. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
Visa övriga samt affilieringar
2013 (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Abstract [en]

The electron transport in the electronic devices has significant influence on the device performance, thus current transport properties determination is highly demanded for a particular device. Herein, we report the facile hydrothermal growth method based fabrication of p-NiO/n-ZnO heterojunction. The material characterization was performed by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and X-ray photo electron spectroscopy. These techniques provided the good crystal quality, pure phase of p-NiO and n-ZnO nanostructures respectively. The measured valance band offset of composite nanostructure is 2.25 eV and conduction band offset was found to be 2.58 eV. The current transport properties of the fabricated p-n junction are governed by three different I-V regions. The impedance spectroscopy was used for the determination of the role of grain boundaries at the interface.

Ort, förlag, år, upplaga, sidor
2013.
Nyckelord [en]
Zinc oxide, nickel oxide, heterojunction, diode, current transport properties
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:liu:diva-103340OAI: oai:DiVA.org:liu-103340DiVA, id: diva2:688545
Tillgänglig från: 2014-01-17 Skapad: 2014-01-17 Senast uppdaterad: 2014-03-27Bibliografiskt granskad
Ingår i avhandling
1. The synthesis, characterization and device fabrication of ZnO, NiO and their composite nanostructures
Öppna denna publikation i ny flik eller fönster >>The synthesis, characterization and device fabrication of ZnO, NiO and their composite nanostructures
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2014. s. 55
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1562
Nyckelord
Zinc oxide; Nickel Oxide; Composite nanostructures; Wide band gap; Low temperature growth; Luminescence, Photo-detector; Light emitting diode
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:liu:diva-103343 (URN)
Disputation
2014-01-24, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2014-01-17 Skapad: 2014-01-17 Senast uppdaterad: 2014-09-18Bibliografiskt granskad

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