Optical and electrical characteristics of aluminum-doped ZnO thin films prepared by solgel technique

Jiménez-González, A.E.; Urueta, Jose A. Soto; Suárez-Parra, R.

doi:10.1016/s0022-0248(98)00422-9

Cited by 301 publications

(125 citation statements)

References 18 publications

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“…It has been observed earlier by other groups [13,14] that upon Mn doping in ZnO the band gap reduces for low concentration doping (< 3 mol% of Mn) and for higher concentration ( > 3 mol%) the band gap increases as expected on the basis of virtual crystal approximation (VCA) because of the band gap of the MnO ~ 4.2 eV. In many dilute magnetic semiconductor (DMS) systems such deviation from the linear monotonic increase in the form of "band gap bowing" has been observed [15][16][17][18][19][20][21] …”

Section: Introductionmentioning

confidence: 83%

Influence of Mn doping on the microstructure and optical property of ZnO

Senthilkumaar

Rajendran²,

Banerjee

et al. 2008

Materials Science in Semiconductor Processing

296

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Undoped and Mn doped ZnO samples with different percentage of Mn content (1 mol%, 2 mol% and 3mol%) were synthesized by a simple solvo-thermal method. We have studied the structural, chemical and optical properties of the samples by using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray (EDX) analysis, Fourier transform infrared (FTIR) spectroscopy and UV-VIS spectroscopy. The XRD spectra show that all the samples are hexagonal wurtzite structures. The lattice parameters calculated for the Mn doped ZnO from the XRD pattern were found to be slightly larger than those of the undoped ZnO, which indicates substitution of Mn in ZnO lattice. SEM photograph shows the grain size of undoped ZnO is bigger than the Mn doped ZnO's indicating hindrance of grain growth upon Mn doping. As the Mn doping increases the optical band gap decreases for the range of Mn doping reported here.

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Section: Introductionmentioning

confidence: 83%

Influence of Mn doping on the microstructure and optical property of ZnO

Senthilkumaar

Rajendran²,

Banerjee

et al. 2008

Materials Science in Semiconductor Processing

296

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“…The small signal at 3411 cm 21 observed is probably due to the contact of the ZnO sample with air resulting in adsorption of a small amount of water vapour. 15 …”

mentioning

confidence: 99%

The effect of processing conditions on varistors prepared from nanocrystalline ZnO

Pillai

Kelly

McCormack³

et al. 2003

J. Mater. Chem.

144

153

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Nanoparticles of ZnO were prepared by the reaction of ethanolic solutions of zinc acetate and oxalic acid followed by drying (80 uC) and calcination (500 uC). Subsequently varistor materials were fabricated from this nanoparticular ZnO via two separate routes:-a) from a ''core shell'' material using metal salts as additives; b) by using a conventional solid state mixing of metal oxides. Sintering (1050 uC) and subsequent electrical studies were carried out for each of these samples and they were compared with commercial varistor samples prepared under similar conditions. ''Core shell'' type varistor material showed considerably higher breakdown voltage (V c~8 50 ¡ 30 V mm 21 ) as compared to a sample prepared by mixing with metal oxides (V c~6 83 ¡ 30 V mm 21 ) or commercial varistor discs (V c~5 07 ¡ 30 V mm 21 ). The high breakdown voltage obtained is attributed to the formation of more varistor-active grain boundaries per unit area.

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“…It was believed that such TiO 2 -OH groups arise due to the hydrolysis reaction in the microemulsion process [20]. Peak at 1628 cm −1 is attributed to bending modes of -OH groups of water molecules adsorbed on the surface of catalyst [21]. Peak at 1389 cm can be assigned to C-O stretching in carbonyl.…”

Section: Ftir Studymentioning

confidence: 99%

Synthesis, Characterization, and Investigation of Visible Light Photocatalytic Activity of C Doped TiO₂/CdS Core-Shell Nanocomposite

Lavand

Malghe

Singh

2015

Indian Journal of Materials Science

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Carbon (C) doped TiO 2 /CdS core-shell nanocomposite (C/TiO 2 /CdS) was synthesized using microemulsion method. Synthesized powder was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), energy dispersive Xray spectroscopy (EDX), transmission electron microscopy (TEM), and UV-visible spectrophotometery. TEM images reveal that C/TiO 2 /CdS core-shell heterostructure is successfully prepared with CdS as a core and C doped TiO 2 as a shell. UV-visible absorption spectra show that CdS nanoparticles act as a sensitizer and effectively enhance the photoabsorption capacity of C/TiO 2 /CdS nanocomposite in visible region. Visible light photocatalytic activity of synthesized nanocomposite was evaluated for the degradation of methylene blue. C/TiO 2 /CdS core-shell nanocomposite exhibits better photocatalytic activity as compared to bare TiO 2 , CdS, CdS/TiO 2 , and C doped TiO 2 .

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Optical and electrical characteristics of aluminum-doped ZnO thin films prepared by solgel technique

Cited by 301 publications

References 18 publications

Influence of Mn doping on the microstructure and optical property of ZnO

Influence of Mn doping on the microstructure and optical property of ZnO

The effect of processing conditions on varistors prepared from nanocrystalline ZnO

Synthesis, Characterization, and Investigation of Visible Light Photocatalytic Activity of C Doped TiO₂/CdS Core-Shell Nanocomposite

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Optical and electrical characteristics of aluminum-doped ZnO thin films prepared by solgel technique

Cited by 301 publications

References 18 publications

Influence of Mn doping on the microstructure and optical property of ZnO

Influence of Mn doping on the microstructure and optical property of ZnO

The effect of processing conditions on varistors prepared from nanocrystalline ZnO

Synthesis, Characterization, and Investigation of Visible Light Photocatalytic Activity of C Doped TiO2/CdS Core-Shell Nanocomposite

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Synthesis, Characterization, and Investigation of Visible Light Photocatalytic Activity of C Doped TiO₂/CdS Core-Shell Nanocomposite