Influence of oxygen partial pressure on electrical and optical properties of Zn0.93Mn0.07O thin films

Li, Xueyong; Li, Hongjian; Yuan, Minglong; Wang, Zhijun; Zhou, Zhao; Xu, Renbo

doi:10.1016/j.jallcom.2010.11.191

Cited by 23 publications

(9 citation statements)

References 31 publications

(29 reference statements)

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“…From the figure it is seen that the Cu doped ZnO sample has an optical energy band gap of 3.04 eV that is lower than that of the undoped ZnO (3.28 eV). Similar red shift in energy band gap of transition-metal doped II-VI semiconductors was reported by Diouri et al [29,30] which was attributed to the p-d spin-exchange interactions between the band electrons and the localized d electrons of transition-metal ion substituting the cation. Elilarassi et al [31] observed a red shift in the band gap in Cu doped ZnO nanoparticles synthesized by solid state reaction method.…”

Section: Uv-visible Absorption Spectrumsupporting

confidence: 80%

Structural, optical and EPR studies on ZnO:Cu nanopowders prepared via low temperature solution combustion synthesis

Reddy

Kokila

Nagabhushana

et al. 2011

Journal of Alloys and Compounds

284

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Section: Uv-visible Absorption Spectrumsupporting

confidence: 80%

Structural, optical and EPR studies on ZnO:Cu nanopowders prepared via low temperature solution combustion synthesis

Reddy

Kokila

Nagabhushana

et al. 2011

Journal of Alloys and Compounds

284

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“…It can be seen that the absorption edge shows a clear red‐shift from 4.03 to 2.93 with the increase of Cu 2+ concentration. This decrease in energy band gap for ZnO:Cu NPs correspond to p‐d spin exchange interactions between the ZnO band electrons and the localized d electrons of doped Cu 2+ and have been observed in different reports . The PL intensity of the trap state emissions of ZnO NPs was quenched with the introduction of Cu impurity to the ZnO lattice, as shown in Figure (b) and a Cu‐related emission due to transition of electrons from trap states (I Zn ) to T 2 acceptor level appeared which showed a clearly red‐shift from 485 to 520 nm.…”

Section: Resultssupporting

confidence: 55%

Rapid, controllable, one‐pot and room‐temperature aqueous synthesis of ZnO:Cu nanoparticles by pulsed UV laser and its application for photocatalytic degradation of methyl orange

et al. 2017

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Zinc oxide (ZnO) and ZnO:Cu nanoparticles (NPs) were synthesized using a rapid, controllable, one-pot and room-temperature pulsed UV-laser assisted method. UV-laser irradiation was used as an effective energy source in order to gain better control over the NPs size and morphology in aqueous media. Parameters effective in laser assisted synthesis of NPs such as irradiation time and laser shot repetition rate were optimized. Photoluminescence (PL) spectra of ZnO NPs showed a broad emission with two trap state peaks located at 442 and 485 nm related to electronic transition from zinc interstitial level (I ) to zinc vacancy level (V ) and electronic transition from conduction band to the oxygen vacancy level (V ), respectively. For ZnO:Cu NPs, trap state emissions disappeared completely and a copper (Cu)-related emission appeared. PL intensity of Cu-related emission increased with the increase in concentration of Cu , so that for molar ratio of Cu:Zn 2%, optimal value of PL intensity was obtained. The photocatalytic activity of Cu-doped ZnO revealed 50 and 100% increasement than that of undoped NPs under UV and visible irradiation, respectively. The enhanced photocatalytic activity could be attributed to smaller crystal size, as well as creation of impurity acceptor levels (T ) inside the ZnO energy band gap.

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“…This might be due to the resistance offered by Mn atoms for the growth of ZnO along c-axis at this temperature. 15 Moreover, minimum diffraction peak intensity for ISA-500 with reduced crystallite size points to enhanced concentration of point defects (diffusion of oxygen at the interstitial sites), which reduces crystalline quality. The re-sputtering of neutral oxygen atoms and surface oxidation of the target (due to excess oxygen) are also reported to hinder grain growth causing the reduction in c-axis (002) orientation.…”

Section: Structural Analysismentioning

confidence: 99%

High temperature ferromagnetic ordering in c-axis oriented ZnO:Mn nanoparticle thin films by tailoring substrate temperature

Ilyas

Lee

Tan

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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This study reports the enhanced ferromagnetic ordering in ZnO:Mn nanoparticle thin films, grown at different substrate temperatures using pulsed laser deposition. The optimum growth conditions were deduced from X-ray, photoemission and magnetic measurements. The X-ray measurements reveal that there was an optimum substrate temperature where the thin films showed relatively stronger texture, better crystallinity and lower strain. Substrate temperature tuned the deep level recombination centers in ZnO:Mn, which changed the optical quality by altering the electronic structure. The M-H curves, in the present study, revealed superior ferromagnetic response of 20nm sized particles in ZnO:Mn thin film grown at a substrate temperature of 450 °C. Ferromagnetic ordering becomes weaker at higher/lower substrate temperatures due to the activation of native defects in ZnO host matrix.

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Influence of oxygen partial pressure on electrical and optical properties of Zn0.93Mn0.07O thin films

Cited by 23 publications

References 31 publications

Structural, optical and EPR studies on ZnO:Cu nanopowders prepared via low temperature solution combustion synthesis

Structural, optical and EPR studies on ZnO:Cu nanopowders prepared via low temperature solution combustion synthesis

Rapid, controllable, one‐pot and room‐temperature aqueous synthesis of ZnO:Cu nanoparticles by pulsed UV laser and its application for photocatalytic degradation of methyl orange

High temperature ferromagnetic ordering in c-axis oriented ZnO:Mn nanoparticle thin films by tailoring substrate temperature

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