Enhancement of thermoelectric properties of transition metals, nickel and copper dually doped ZnO

Soumya, C.; Pradyumnan, P. P.

doi:10.1016/j.mtcomm.2023.106197

Cited by 6 publications

(4 citation statements)

References 41 publications

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“…This may be due to electrons located at shallow and deep donor defect levels in the ZnO band gap. According to Mott's law, electrical conductivity and Seebeck coefficient are inversely proportional [50]. In this study, the electrical conductivity of the doped samples is higher than that of pure ZnO, so the Seebeck coefficients of doped samples are lower.…”

Section: Sc Oc Inmentioning

confidence: 54%

“…The phonon mean free path depends on the electronegativity difference between the impurity element and the host material. As the difference increases, the mean phonon mean free path will decrease, reducing the thermal conductivity [50]. We know electronegativity value of Zn +2 , Ni +2 and Bi +3 is 1.65, 1.91 and 2.04, respectively.…”

Section: Sc Oc Inmentioning

confidence: 96%

“…It was observed that when ZnO was used as the photoanode in quantum dot solar cells, the efficiency of the solar cell was between 0.44% and 4.8% [49]. Undoped, Li, Ag, In (Indium), La (Lanthanum), I (Iodine) and B doped ZnO materials were used in dye-sensitized solar cells, and the highest efficiency of 6.75% was obtained for B-doped ZnO [50]. When ZnO-based materials were used as electron-transporting materials in perovskite solar cells, the efficiency increased up to 20% [49].…”

Section: Sc Oc Inmentioning

confidence: 99%

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Enhancement of structural, optical, electrical, optoelectronic and thermoelectric properties of ZnO thin film via Ni doping and Ni-B co-doping

Üzar,

Abdulaziz,

Erbas

et al. 2024

Phys. Scr.

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In this study, the effects of nickel (Ni) and boron (B) elements on the structural, optical, electrical, optoelectronic, and thermoelectric properties of zinc oxide (ZnO) material were investigated. Therefore, undoped ZnO, 3% Ni-doped ZnO (Zn0.97Ni0.03O), and 3% Ni-1% B co-doped ZnO (Zn0.96Ni0.03B0.01O) solutions were prepared by the sol gel method. The produced solutions were coated on glass and p-type Si substrates via dip coating and spraying methods in the form of thin films. We produce pure and n-type semiconductors in the form of nanodots which have wurtzite ZnO polycrystalline structure for all samples. Ni and B co-doped sample is morphologically, electrically and optically enhanced the ZnO material with 3.08 eV band gap, homogenous surface and the highest electrical conductivity. In addition, the best material among the three samples that can be used as a visible light-sensitive sensor is Zn0.96Ni0.03B0.01O under feedback voltage. Technologically, this material can be turned into a photodiode device in the form of Au/Zn0.96Ni0.03B0.01O/p-Si. While the obtained ideality factor of ZnO from the forward bias region decreases from 5.7 to 3.4, its barrier height increases from 0.636 eV to 0.667 eV and serial resistance of contact decreases from 121.6 × 103 Ω to 5.6 × 103 Ω with Ni and B co-doping. Ni doping thin film improves the photovoltaic, and thermoelectric properties of ZnO. Ni-doped ZnO sample can be studied in form of the thin films as a thermoelectric material due to its ZT value is nearly 1.73 × 10–4 at 650 K. Its thermoelectric performance is 13 times better than the that of pure ZnO for the same temperature values. The efficiency of Ni-doped ZnO sample as solar cell increases 10 times compared to pure ZnO. In addition to the production of materials with improved energy efficiency, economical products suitable for use in large areas have been obtained in this study.

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Section: Sc Oc Inmentioning

confidence: 54%

Section: Sc Oc Inmentioning

confidence: 96%

Section: Sc Oc Inmentioning

confidence: 99%

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Enhancement of structural, optical, electrical, optoelectronic and thermoelectric properties of ZnO thin film via Ni doping and Ni-B co-doping

Üzar,

Abdulaziz,

Erbas

et al. 2024

Phys. Scr.

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“…Investigating the optical properties of ZnO-based films, recent research has focused on understanding their bandgap energies and light absorption capabilities. A study by Soumya et al (2023) investigated the bandgap engineering of ZnO films through precise doping strategies [26]. By varying the doping concentrations of transition metal ions, they observed a redshift in the optical absorption spectra, demonstrating the tunability of bandgap energies in ZnO-based films.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Transport and Enhanced Spin-Polarized Photo Response in Solution-Processed Vertically Aligned Zn0.9Ni0.1O Nanowires

Kazmi,

Raza

et al. 2023

Magnetochemistry

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In this study, we grew pristine and Ni-doped vertically aligned zinc oxide nanowires (NWs) on a glass substrate. Both the doped and pristine NWs displayed dominant 002 peaks, confirming their vertical alignment. The Ni-doped NWs exhibited a leftward shift compared to the pristine NWs. TEM measurements confirmed the high crystallinity of individual NWs, with a d-spacing of ~0.267 nm along the c-axis. Ni-doped NWs had a higher density, indicating increased nucleation sites due to nickel doping. Doped NW films on glass showed enhanced absorbance in the visible region, suggesting the creation of sub-gap defect levels from nickel doping. Magnetization vs. magnetic field measurements revealed a small hysteresis loop, indicative of soft ferromagnetic behavior. Current transient plots demonstrated an increase in current with an applied magnetic field. Two-terminal devices exhibited a photo response that intensified with magnetic field application. This increase was attributed to parallel grain alignment, resulting in enhanced carrier concentration and photo response. In the dark, transport properties displayed negative magnetoresistance behavior. This magneto-transport effect and enhanced photo response (under an LED at ~395 nm) were attributed to giant magnetoresistance (GMR) in the aligned NWs. The observed behavior arose from reduced carrier scattering, improved transport properties, and parallel spin alignment in the magnetic field.

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Influence of Metal (Al, Mg, Sm, and Cu) Dopants on Structural, Optical, Magnetic, and Antimicrobial Properties of ZnO Nanopowders Synthesized by Coprecipitation Method

Sowmya,

Aparna,

Chendra Prakash

et al. 2023

Physica Status Solidi (a)

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Pure and metal‐doped ZnO nanopowders with composition formula M0.04Zn0.96O (where M=Al, Mg, Sm and Cu) have been synthesized using the co‐precipitation method. The structural characterization of the synthesized powders was investigated using X‐ray diffraction (XRD) and the results confirm the hexagonal wurtzite structure without any additional phases. The change in structural parameters of ZnO with dopants was estimated using X‐ray peak profile analysis. The structural characterization was further analyzed by Fourier transform infrared spectroscopy (FTIR). The size and morphology of the synthesized powders were analyzed by a field emission scanning electron microscope (FE‐SEM), which also evidences the formation of uniform nanostructures with quasi‐spherical and hexagonal shapes. Moreover, the elemental composition of these metal‐doped nanostructures is determined by EDX measurements. UV‐Vis. spectroscopy is used to determine the energy band gap of ZnO by adding metal ion dopants. A vibration sample magnetometer (VSM) was employed to measure the samples’ magnetic properties, and dopants were found to induce distinct magnetic behaviors in ZnO. The antimicrobial activity of the synthesized powders was measured using the well diffusion method. It was observed that the introduction of dopant metals led to increased microbial activity. Among the doped ZnO variants, Al‐doped ZnO exhibited the highest level of microbial activity compared to pure ZnO and other samples.This article is protected by copyright. All rights reserved.

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Enhancement of thermoelectric properties of transition metals, nickel and copper dually doped ZnO

Cited by 6 publications

References 41 publications

Enhancement of structural, optical, electrical, optoelectronic and thermoelectric properties of ZnO thin film via Ni doping and Ni-B co-doping

Enhancement of structural, optical, electrical, optoelectronic and thermoelectric properties of ZnO thin film via Ni doping and Ni-B co-doping

Magneto-Transport and Enhanced Spin-Polarized Photo Response in Solution-Processed Vertically Aligned Zn0.9Ni0.1O Nanowires

Influence of Metal (Al, Mg, Sm, and Cu) Dopants on Structural, Optical, Magnetic, and Antimicrobial Properties of ZnO Nanopowders Synthesized by Coprecipitation Method

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