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[email protected]2 Core Shell Nanorod Arrays with Tailored Structural, Electrical, and Optical Properties for Photovoltaic Application

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Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
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Institute of Physics, Bijenička cesta 46, 10000 Zagreb, Croatia
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Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
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Sincrotrone Trieste, Strada Statale 14, km 163.5, 34012 Basovizza (TS), Italy
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ETH Zürich, Auguste-Piccard-Hof 1, 8093 Zürich, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editors: Igor Djerdj and Jasminka Popović
Molecules 2019, 24(21), 3965; https://doi.org/10.3390/molecules24213965
Received: 15 October 2019 / Revised: 30 October 2019 / Accepted: 31 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue Synthesis and Structural Investigations of Nanocrystalline Materials)
ZnO has prominent electron transport and optical properties, beneficial for photovoltaic application, but its surface is prone to the formation of defects. To overcome this problem, we deposited nanostructured TiO2 thin film on ZnO nanorods to form a stable shell. ZnO nanorods synthesized by wet-chemistry are single crystals. Three different procedures for deposition of TiO2 were applied. The influence of preparation methods and parameters on the structure, morphology, electrical and optical properties were studied. Nanostructured TiO2 shells show different morphologies dependent on deposition methods: (1) separated nanoparticles (by pulsed laser deposition (PLD) in Ar), (2) a layer with nonhomogeneous thickness (by PLD in vacuum or DC reactive magnetron sputtering), and (3) a homogenous thin layer along the nanorods (by chemical deposition). Based on the structural study, we chose the preparation parameters to obtain an anatase structure of the TiO2 shell. Impedance spectroscopy shows pure electron conductivity that was considerably better in all the [email protected]2 than in bare ZnO nanorods or TiO2 layers. The best conductivity among the studied samples and the lowest activation energy was observed for the sample with a chemically deposited TiO2 shell. Higher transparency in the visible part of spectrum was achieved for the sample with a homogenous TiO2 layer along the nanorods, then in the samples with a layer of varying thickness. View Full-Text
Keywords: core–shell; ZnO nanorods; TiO2 thin film; pulsed laser deposition; DC reactive magnetron sputtering; chemical deposition; electrical properties; optical properties core–shell; ZnO nanorods; TiO2 thin film; pulsed laser deposition; DC reactive magnetron sputtering; chemical deposition; electrical properties; optical properties
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Panžić, I.; Juraić, K.; Krstulović, N.; Šantić, A.; Belić, D.; Blažeka, D.; Plodinec, M.; Mandić, V.; Macan, J.; Hammud, A.; Ivanov, D.; Plaisier, J.; Willinger, M.G.; Gracin, D.; Gajović, A. [email protected]2 Core Shell Nanorod Arrays with Tailored Structural, Electrical, and Optical Properties for Photovoltaic Application. Molecules 2019, 24, 3965.

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