Tuning optical band gap of vertically aligned ZnO nanowire arrays grown by homoepitaxial electrodeposition

Anthony, Savarimuthu Philip; Lee, Jeong In; Kim, Jin Kon

doi:10.1063/1.2711419

Cited by 110 publications

(45 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ZnO nanowire arrays showed high transmittance Nano Res 9 in the visible range due to the large electronic band gap. Interestingly, the band gap of the ZnO nanowire arrays could be tuned by simply changing the zinc precursor concentration during the electrodeposition [127].…”

Section: Electrodepositionmentioning

confidence: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

View full text Add to dashboard Cite

One-dimensional (1D) ZnO nanostructures have been studied intensively and extensively over the last decade not only for their remarkable chemical and physical properties, but also for their current and future diverse technological applications. This article gives a comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods. We will cover the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, positioncontrolled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronic, and energy harvesting devices.

show abstract

Section: Electrodepositionmentioning

confidence: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

View full text Add to dashboard Cite

show abstract

“…[10][11][12][13] The ED of ZnO nanowires has been focused mostly on the preparation of nanorod/nanowire arrays by the template method and on flat substrates. 14,15 The ZnO electrodeposition is based on the reduction of an oxygen precursor such as dissolved molecular oxygen, nitrate ions or hydrogen peroxide. For example, Cembrero et al 16 reported on the cathodic electrodeposition of ZnO nanocolumns and nanowires from zinc chloride solutions saturated in molecular oxygen.…”

mentioning

confidence: 99%

Influence of Deposition Potential on Structure of ZnO Nanowires Synthesized in Track-Etched Membranes

Prună

Pullini

Mataix

2012

J. Electrochem. Soc.

View full text Add to dashboard Cite

Single-crystal ZnO nanowires long up to several microns were fabricated by one-step electrochemical deposition. A template-based process employing track-etched polycarbonate (TE-PC) membranes was used for this purpose. The morphology and the structure characteristics of the ZnO nanowires were analyzed by means of Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB), Transmission Electron Microscopy (TEM), and Selected Area Electron Diffraction (SAED). The growth process conditions turned out to have a marked influence on the crystal nature and morphology of the nanowires. Deposition rates ranging from 0.4 nm s −1 and up to 0.6 nm s −1 were recorded for the growth of ZnO nanowires. The obtained results showed that by using carefully controlled deposition conditions single crystalline nanowires and fine-grained structures can be routinely obtained. ZnO has extrusive physical properties such as a direct bandgap in the ultraviolet range (3.37 eV) or a large exciton binding energy (60 meV) which have made it a great application prospect.1, 2 ZnO nano-objects have been widely investigated in the recent years owing to promising applications in nanodevices. They showed high sensitivity to different chemicals, have piezo-and pyro-electric properties, etc. 3,4 As it has been shown that band edge, exciton energies, and UV luminescence of ZnO nanostructures are affected by crystallite size and crystal morphology, 5,6 it is desirable to tailor their electronic properties in order to exploit the broad range of applications.Nowadays, many efforts still focus on synthesizing oriented onedimensional ZnO nanostructures. Up to now, techniques using sophisticated and expensive equipments but also low temperature and cost-effective methods such as electrodeposition (ED) and hydrothermal deposition were employed for the synthesis of nanostructures. 7-9The major advantage of the electrochemical synthesis is given by its application for large area and high throughput productions, therefore suitable for an industrial use. [10][11][12][13] The ED of ZnO nanowires has been focused mostly on the preparation of nanorod/nanowire arrays by the template method and on flat substrates. 14, 15The ZnO electrodeposition is based on the reduction of an oxygen precursor such as dissolved molecular oxygen, nitrate ions or hydrogen peroxide. For example, Cembrero et al. 16 reported on the cathodic electrodeposition of ZnO nanocolumns and nanowires from zinc chloride solutions saturated in molecular oxygen. The general scheme for ED of ZnO employing different oxygen precursors is supposed as follows.The reaction at the cathode surface employing different oxygen precursors: The process evolves itself drifting the pH of the electrolyte to a constant increase and to a local supersaturation of the bath in the vicinity of the electrode, thus provoking the precipitation on the electrode surface of ZnO;18 therefore, if a specific crystal order is desired, the pH of the electrolytic solution has to be precisely controlled and adjusted to a proper value.As...

show abstract

“…These techniques for the growth of doped and undoped ZnO nanorods include metal-organic chemical vapour deposition (MOC-VD), metal-organic vapour phase epitaxy (VPE), pulsed laser deposition (PLD), Carbo-thermal evaporation (CTE), aqueous chemical growth (ACG) electro deposition (ED) and hydrothermal deposition (HD) (Wu and Liu, 2002;Bakin et al, 2007;Nobis et al, 2004;Czekalla et al, 2008;Vayssieres et al, 2001;Illy et al, 2005;Park et al, 2002;Anthony et al, 2007;Damen et al, 1966). The route of synthesis reported in this paper is wet and solution based.…”

Section: Introductionmentioning

confidence: 98%

Optical and morphological studies of transition metal doped ZnO nanorods and their applications in hybrid bulk heterojunction solar cells

Shah

Naz

Ali

et al. 2017

Arabian Journal of Chemistry

View full text Add to dashboard Cite

One of the challenges in improving the efficiency of hybrid solar cells is to remove crystal defects from the semiconducting nanoparticles. Here we report the synthesis, characterization and applications of transition metal doped ZnO nanorods in hybrid bulk heterojunction solar cells. Mn x Zn 1Àx O and Ni x Zn 1Àx O with dopant concentrations ranging from x = 0.01-0.10 were successfully synthesized by a novel facile solution-processed wet chemical method, which gave better yield at low cost and temperature. The morphological and optical properties of the material were investigated by Transmission electron microscopy (TEM), UV-Visible and Fluorescence spectroscopies. TEM measurements confirmed the reduction in size of nanorods upon doping. UV-Visible spectra of doped nanorods showed blue shift with respect to the reference undoped ZnO. The defect emissions were completely disappeared from the fluorescence spectra upon doping at high concentrations. These doped nanorods in combination with P3HT were employed in the hybrid solar cells which gave better current densities than their corresponding undoped counterparts. ª 2014 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

show abstract

Tuning optical band gap of vertically aligned ZnO nanowire arrays grown by homoepitaxial electrodeposition

Cited by 110 publications

References 25 publications

One-dimensional ZnO nanostructures: Solution growth and functional properties

One-dimensional ZnO nanostructures: Solution growth and functional properties

Influence of Deposition Potential on Structure of ZnO Nanowires Synthesized in Track-Etched Membranes

Optical and morphological studies of transition metal doped ZnO nanorods and their applications in hybrid bulk heterojunction solar cells

Contact Info

Product

Resources

About