Temperature and Frequency Dependence Electrical Properties of Zn<sub>1-x</sub>Ca<sub>x</sub>O Nanoceramic

Das, T. K.; Das, Bikram Keshari; Parashar, Kajal; Parashar, S. K. S.

doi:10.12693/aphyspola.130.1358

Cited by 20 publications

(7 citation statements)

References 16 publications

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“…Zinc oxide (ZnO) is a II-VI semiconductor with wide direct band gap energy (3.37 eV) at room temperature, that is suitable for short wavelength optoelectronic applications and it has a large exciton binding energy (60 meV). Due to its properties like low cost, non-toxicity, abundance in nature, suitability to doping, ZnO has got wide device applications in different areas such as ultraviolet light-emitters, gas sensors, piezoelectric transducers, and solar cells [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Bilgili¹

2019

Acta Phys. Pol. A

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Zn1−xMnxO (x = 0.00, 0.01, and 0.05, respectively) was synthesized by using solid state reaction method. The structural properties were characterized by using X-ray diffraction and scanning electron microscopy. Optical properties were investigated by UV-visible spectroscopy. X-ray diffraction patterns indicate that all samples have hexagonal wurtzite structure without any impurity phases. The diffraction intensity increases and the peak position shifts to a lower 2θ angle with Mn concentration. The lattice parameters a and c, the volume of unit cell increase with Mn content indicating that Mn 2+ ions go to Zn 2+ ions in ZnO lattice. The grain size increases with Mn doping while the microstrain and dislocation density decrease. UV-vis spectra of the samples show that undoped ZnO sample has an energy band gap Eg of 3.34 eV. The optical study indicates a red shift in the absorbance spectra and a decrease in the band gap Eg with Mn content. This decrease of band gap may be attributed to the influence of dopant ions. The morphology and grain distribution of ZnO samples were analysed by scanning electron microscopy. The particle sizes are higher in doped samples when compared to the undoped sample and the surface roughness increases with Mn content. The grains are closely, densely packed and pores/voids between the grains increase with Mn content.

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Section: Introductionmentioning

confidence: 99%

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Bilgili¹

2019

Acta Phys. Pol. A

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“…The bond length (L) is analyzed by using the relation where a and c are lattice parameter and u is the oxygen positional parameter [26,40].…”

Section: Effect Of Calcination Temperature On Structural Parametersmentioning

confidence: 99%

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

Das

Parashar

et al. 2020

Preprint

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In this work, high energy ball milling (HEBM) technique has been employed to successfully synthesize a series of Cu-doped ZnO nanoceramics (Zn 1-x Cu x O) with Cu concentration x = 0, 0.01, 0.02, 0.03 and 0.04. The synthesized nanoceramic was analysed by XRD, FESEM, TEM, Uv-Vis-DRS. The structural, microstructural and optical properties of the synthesized sample with different duration of milling, doping concentration and temperature has been investigated. X-ray diffraction result indicates that the samples are wurtzite structure with single phase. A decrease in peak intensity was observed with increase in milling time. 10h milled Cu doped ZnO sample shows single phase. After calcination at 900 ºC in x = 0.04 few peaks related to CuO was observed indicating the solubility limit of Cu in ZnO is 3 atomic%. With increase in milling time crystallite decreases where as strain increases however after calcination crystallite increases where as strain decreases. After calcination peak intensity increases. The specific surface area of ZnO increases after Cu doping but decreases after calcination. Bond length decreases after calcination but lattice distortion increases. FESEM micrograph shows particle growth after calcination. The average particle size decreases with increase in Cu concentration(30 nm to 20 nm) whereas increases after calcination and sintering (488 nm-2706 nm).The band gap decreases with increasing in milling time also with increase in Cu concentration and after calcination. Cu doping in ZnO shows red shift indicating Cu doped ZnO samples are suitable for optoelectronic device applications.

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“…Due to its features, ZnO is suitable for short-wavelength optoelectronic applications. Further, because of its properties like low cost, non-toxicity, abundance in nature, and suitability to doping, ZnO has wide device applications in different areas, such as ultraviolet lightemitters, gas sensors, piezoelectric transducers and solar cells [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The structural and optical properties of Al and Mg doped ZnO synthesized by solid state reaction method

Bilgili

2021

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, the structural and optical properties of Al and Mg doped zinc oxide Zn0.98M0.02O (M= Al, Mg) prepared by solid state reaction method is investigated. Xray diffraction (XRD), Scanning Electron Microscopy (SEM), UV-Visible spectroscopy (UV-Vis) and Fourier Transform Infrared (FTIR) spectroscopy were employed to study the structural and optical properties. With XRD analysis, it was revealed that all the samples are hexagonal wurtzite structure and exhibit no impurity phases. The reflectance spectra was used to determine the optical band gap of the samples. And it was found that undoped ZnO sample has an energy band gap of 3.16 eV which increases with Al and Mg doping, probably driven by the decrease in the lattice parameters. The structural bond vibrations of undoped and doped ZnO were analysed by FTIR spectroscopy, and it was seen that the broad absorption band is at approximately 550 cm -1 for all the samples, which corresponds to the stretching vibration of Zn-O bond.

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Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Cited by 20 publications

References 16 publications

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

The structural and optical properties of Al and Mg doped ZnO synthesized by solid state reaction method

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Temperature and Frequency Dependence Electrical Properties of Zn1-xCaxO Nanoceramic

Cited by 20 publications

References 16 publications

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

The structural and optical properties of Al and Mg doped ZnO synthesized by solid state reaction method

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Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic