An investigation on linear optical properties of dilute Cr doped ZnO thin films synthesized via sol–gel process

Kandjani, Ahmad Esmaielzadeh; Tabriz, M. Farzalipour; Moradi, Omid; Mehr, H. R. Rezaeian; Kandjani, S. Ahmadi; Vaezi, M.R.

doi:10.1016/j.jallcom.2011.01.133

Cited by 39 publications

(19 citation statements)

References 22 publications

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“…Doped ZnO films are generally deposited by pulsed laser deposition (PLD) [44][45][46][47][48], magnetron co-sputtering [49][50][51][52][53][54][55], including direct current (DC) reactive and radio-frequency (RF), molecular beam epitaxy (MBE) [56][57][58][59][60], chemical vapor deposition [61,62] and sol-gel methods [63][64][65][66][67]. It is known that piezoelectricity is related to the crystallographic quality of ZnO films and high c-axis orientation can lead to good piezoelectricity of ZnO films [68][69][70][71][72].…”

Section: Film Growth Of Tm-doped Znomentioning

confidence: 99%

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

Pan

Luo

Yang

et al. 2011

Sci. China Technol. Sci.

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In recent years, with the growing concerns on environmental protection and human health, new materials, such as lead-free piezoelectric materials, have received increasing attention. So far, three types of lead-free piezoelectric systems have been widely researched, i.e., perovskites, bismuth layer-structured ferroelectrics, and tungsten-bronze type ferroelectrics. This article presents a new type of environmental friendly piezoelectric material with simple structure, the transition-metal(TM)-doped ZnO. Through substituting Zn 2+ site with small size ion, we obtained a series of TM-doped ZnO with giant piezoresponse, such as Zn 0.975 V 0.025 O of 170 pC/N, Zn 0.94 Cr 0.06 O of 120 pC/N, Zn 0.913 Mn 0.087 O of 86 pC/N and Zn 0.988 Fe 0.012 O of 127 pC/N. The tremendous piezoresponses are ascribed to the introduction of switchable spontaneous polarization and high permittivity in TM-doped ZnO.The microscopic origin of giant piezoresponse is also discussed. Substitution of TM ion with small ionic size for Zn 2+ results in the easier rotation of noncollinear TM-O1 bonds along the c axis under the applied field, which produces large piezoelectric displacement and corresponding piezoresponse enhancement. Furthermore, it proposes a general rule to guide the design of new wurtzite semiconductors with enhanced piezoresponses. That is, TM-dopant with ionic size smaller than Zn 2+ substitutes for Zn 2+ site will increase the piezoresponse of ZnO significantly. Finally, we discuss the improved performances of some TM-doped ZnO based piezoelectric devices.

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Section: Film Growth Of Tm-doped Znomentioning

confidence: 99%

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

Pan

Luo

Yang

et al. 2011

Sci. China Technol. Sci.

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“…Subsequently, various experiments on ZnO doped by 3d transition metal ions in different forms were carried out to confirm the predictions of RTFM. Unfortunately, the experimental results could not reach definite conclusions owing to controversial reports as the findings differ widely [3][4][5] in this regard. The same material system has been reported to display ferromagnetic, paramagnetic or spin glass behavior, depending on the sample preparation parameters.…”

Section: Introductionmentioning

confidence: 97%

Study of electronic and magnetic properties of vacuum annealed Cr doped ZnO

Singhal

2012

Journal of Alloys and Compounds

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“…An alternative strategy for increasing the electron-hole life-time is the formation of hetero-structures between the semiconductors with different majority carrier type. By forming junction between p-type and n-type semiconductors a depletion layer at the p-n interfacial region can be formed that induces an electric field, which results in decreased electron-hole pair recombination rate 4,5,6,7 A major factor in controlling photocatalytic efficiencies is their optical properties, which highly depends on size, dopants, impurities, and morphology of the materials 8,9 . In addition to the optoelectronic properties, the catalytic performance of semiconductor materials also relies highly on the surface area as well as the number of active sites present on the catalyst surface 10,11 .…”

Section: Introductionmentioning

confidence: 99%

Controlling Core/Shell Formation of Nanocubic p-Cu₂O/n-ZnO Toward Enhanced Photocatalytic Performance

et al. 2015

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p-Type Cu2O/n-type ZnO core/shell photocatalysts has been demonstrated to be an efficient photocatalyst as a result of their interfacial structure tendency to reduce the recombination rate of photogenerated electron-hole pairs. Monodispersed Cu2O nanocubes were synthesized and functioned as the core, on which ZnO nanoparticles were coated as the shells having varying morphologies. The evenly distributed ZnO decoration as well as assembled nanospheres of ZnO were carried out by changing the molar concentration ratio of Zn/Cu. The results indicate that the photocatalytic performance is initially increased, owing to formation of small ZnO nanoparticles and production of efficient p-n junction heterostructures. However, with increasing Zn concentration, the decorated ZnO nanoparticles tend to form large spherical assemblies resulting in decreased photocatalytic activity due to the interparticle recombination between the agglomerated ZnO nanoparticles. Therefore, photocatalytic activity of Cu2O/ZnO heterostructures can be optimized by controlling the assembly and morphology of the ZnO shell.

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An investigation on linear optical properties of dilute Cr doped ZnO thin films synthesized via sol–gel process

Cited by 39 publications

References 22 publications

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

Study of electronic and magnetic properties of vacuum annealed Cr doped ZnO

Controlling Core/Shell Formation of Nanocubic p-Cu₂O/n-ZnO Toward Enhanced Photocatalytic Performance

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An investigation on linear optical properties of dilute Cr doped ZnO thin films synthesized via sol–gel process

Cited by 39 publications

References 22 publications

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

Giant piezoresponse and promising application of environmental friendly small-ion-doped ZnO

Study of electronic and magnetic properties of vacuum annealed Cr doped ZnO

Controlling Core/Shell Formation of Nanocubic p-Cu2O/n-ZnO Toward Enhanced Photocatalytic Performance

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Product

Resources

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Controlling Core/Shell Formation of Nanocubic p-Cu₂O/n-ZnO Toward Enhanced Photocatalytic Performance