Optical and magnetic properties of ZnCoO thin films synthesized by electrodeposition

Tortosa, M.; Mollar, M.; Marı́, B.; Lloret, Francesc

doi:10.1063/1.2952548

Cited by 29 publications

(20 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 4 shows the XRD patterns of the Zn 1− x Co x O nanorods, which can be identified as the wurtzite structure of ZnO, showing that the Co doping does not significantly affect the hexagonal close pack structure of wurtzite ZnO. There are no detectable secondary phases of CoO or Co 3 O 4 or any other crystalline (ZnO) x (CoO) 1− x phases in the nanorods as the peaks corresponding to these phases are not observed 23 . The strong peak at approximately 2θ angle of 34.46° corresponds to the (0002) peak of ZnO and the small peak at around 2θ of 72.60° corresponds to (0004) peak of ZnO, which is the second‐order peak of (0002).…”

Section: Resultsmentioning

confidence: 99%

“…There are no detectable secondary phases of CoO or Co 3 O 4 or any other crystalline (ZnO) x (CoO) 1Àx phases in the nanorods as the peaks corresponding to these phases are not observed. 23 The strong peak at approximately 2y angle of 34.461 corresponds to the (0002) peak of ZnO and the small peak at around 2y of 72.601 corresponds to (0004) peak of ZnO, which is the second-order peak of (0002). The nanorods grew vertically along the [0001] direction, which is the c-axis of the hexagonal structure.…”

Section: November 2010mentioning

confidence: 99%

See 1 more Smart Citation

Morphology, Optical, and Magnetic Properties of Zn_1−xCo_xO Nanorods Grown via a Wet Chemical Route

Kartawidjaja

Lim

et al. 2010

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Co‐doped ZnO nanorods (Zn1−xCoxO) with x=0.05, 0.1, and 0.2 were successfully grown on indium‐doped tin oxide glass substrates via a wet chemical route at 70°C for 10 h. The effect of Co‐doping level on the morphology, crystalline phases, optical, and magnetic properties of the ZnO nanorods was studied. Based on scanning electron microscopy, TEM, and XRD studies, it is confirmed that Co‐doped ZnO nanorods were grown along the [0001] direction. Co doping affects the d‐spacing and with an increasing Co concentration, the lattice parameter c is increased slightly. The incorporation of Co in ZnO is confirmed with XPS, whereby it is shown that the excitation state of Co is (+2), which rules out the formation of a secondary phase such as Co2O3 or Co3O4, which is consistent with XRD phase analysis results. The near‐band edge emission peak of ZnO nanorods is red shifted in response to Co doping, and the band gap energy of (Zn1−xCoxO) nanorods decreases with the increasing Co doping. Zn0.95Co0.05O and Zn0.9Co0.1O nanorods exhibit a degree of paragmagnetism, while the nanorods with higher Co concentration (Zn0.8Co0.2O) exhibit ferromagnetic behavior at room temperature.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: November 2010mentioning

confidence: 99%

Morphology, Optical, and Magnetic Properties of Zn_1−xCo_xO Nanorods Grown via a Wet Chemical Route

Kartawidjaja

Lim

et al. 2010

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

“…For example, the authors have already reported on several ternary ZnMO films (M 0Cd, Co, Mn, Fe) [11][12][13][14] synthesized by ED. In this paper, we report on the electrochemical synthesis and structural, optical and photoelectrochemical characterization of Cu-doped ZnO films exhibiting p-type behaviour.…”

Section: Introductionmentioning

confidence: 99%

p-Type behaviour of electrodeposited ZnO:Cu films

Marı́

Sahal

Cerqueira

et al. 2012

J Solid State Electrochem

View full text Add to dashboard Cite

Cu-doped ZnO (ZnO:Cu) thin films and ZnO/ ZnO:Cu homojunction devices were electrodeposited on conductive glass substrates in a non-aqueous electrolyte containing Cu and Zn salts. The Cu content of the films is proportional to the Cu/Zn precursor ratio in the deposition electrolyte. ZnO:Cu was found to be of a hexagonal wurtzite structure with (002) preferred orientation. A transition from n-type to p-type was observed for ZnO:Cu films with a Cu/ Zn ratio higher than 2% as inferred from the change in the direction of the photocurrent. The rectifying characteristics shown by homojunction devices further confirm the p-type conductivity of ZnO:Cu layers.

show abstract

“…[23][24][25] For the synthesis of these materials solution based methods are particularly attractive since they are relatively cheap to employ and operate at low temperatures. However, while different low temperature deposition methods are reported 18,[26][27][28][29] the direct, low temperature growth of ZnO:Co onto substrates is found to result in comparably low cobalt related d-d visible light absorption. 28,30 A main focus here is therefore the development of simple methods for the growth of ZnO:Co with controllable cobalt concentration and therefore visible light activity.…”

mentioning

confidence: 99%

ZnO Nanorod-Arrays as Photo-(Electro)Chemical Materials: Strategies Designed to Overcome the Material's Natural Limitations

Kegel

Povey

Pemble

2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

The urgent need for clean and storable energy drives many currently topical areas of materials research. Among the many materials under investigation zinc oxide is one of the most studied in relation to its use in photo-(electro)chemical applications. This study aims to give an overview of some of the main challenges associated with the use of zinc oxide for these applications: the high density of intrinsic defects which can lead to fast recombination, low visible light absorption and the occurrence of photo-corrosion. Employing simple low-temperature solution based methods; it is shown how defect-engineering can be used to increase the photoelectrochemical performance and how doping can strongly increase the visible light absorption of zinc oxide nanorod-arrays. Furthermore the deposition of ultra-thin titanium dioxide layers using atomic layer deposition is investigated as possible route for the protection of zinc oxide against photo-corrosion. As one of the most studied metal-oxides Zinc Oxide (ZnO) has already found its way into many industrial applications. Nevertheless enormous research interest is still focused on this earth-abundant, environmentally-friendly material as it offers interesting material properties such as a high exciton binding energy, a direct bandgap and comparably high charge carrier mobility.1 Furthermore the ability to grow ZnO nanostructures using a wide range of deposition techniques offers new perspectives for the material to be used in opto-electronics. Low-temperature solution based methods are of particular interest as possible routes to the low-cost growth of high surface-area nanostructures for the integration of ZnO into novel energy production and storage devices. The steadily growing research areas of solar water splitting and photo-catalysis are prominent examples of areas where interest in ZnO-based materials and devices may be found. [4][5][6][7][8][9][10][11] For these applications the nature of the semiconductor/electrolyte interface plays a crucial role. It is of the highest importance to carefully engineer the materials properties in order ensure effective charge carrier transport across the interface. In turn it must be the goal of materials research to tailor the ZnO toward these target applications, where possible addressing the key issues of:Low visible-light absorption.-Since ZnO exhibits a large bandgap (ca. 3.3 eV) only a small fraction of sunlight is absorbed thus dramatically hindering the use of ZnO for photo-(electro)chemical applications. A common strategy to change the electronic structure of a semiconductor is the introduction of dopants into the host material. In the case of ZnO the material has been doped with various elements whereby many studies focus on doping with transition metals (TMs) such as nickel, magnesium, iron or cobalt.7,12-17 Historically, research focused on transition metal doping has been fueled by the possible creation of ferromagnetism in these materials -especially in the case of cobalt doping. 12,15,[18][19][20][21] On the other h...

show abstract

Optical and magnetic properties of ZnCoO thin films synthesized by electrodeposition

Cited by 29 publications

References 26 publications

Morphology, Optical, and Magnetic Properties of Zn_1−xCo_xO Nanorods Grown via a Wet Chemical Route

Morphology, Optical, and Magnetic Properties of Zn_1−xCo_xO Nanorods Grown via a Wet Chemical Route

p-Type behaviour of electrodeposited ZnO:Cu films

ZnO Nanorod-Arrays as Photo-(Electro)Chemical Materials: Strategies Designed to Overcome the Material's Natural Limitations

Contact Info

Product

Resources

About

Optical and magnetic properties of ZnCoO thin films synthesized by electrodeposition

Cited by 29 publications

References 26 publications

Morphology, Optical, and Magnetic Properties of Zn1−xCoxO Nanorods Grown via a Wet Chemical Route

Morphology, Optical, and Magnetic Properties of Zn1−xCoxO Nanorods Grown via a Wet Chemical Route

p-Type behaviour of electrodeposited ZnO:Cu films

ZnO Nanorod-Arrays as Photo-(Electro)Chemical Materials: Strategies Designed to Overcome the Material's Natural Limitations

Contact Info

Product

Resources

About

Morphology, Optical, and Magnetic Properties of Zn_1−xCo_xO Nanorods Grown via a Wet Chemical Route

Morphology, Optical, and Magnetic Properties of Zn_1−xCo_xO Nanorods Grown via a Wet Chemical Route