Impedance spectroscopy of nanostructured ZnO morphologies

Rathnasekara, Rusiri; Hari, Parameswar

doi:10.1557/s43578-021-00219-0

Cited by 6 publications

(17 citation statements)

References 56 publications

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“…The overall conversion efficiency (η) of DSSCs is obtained by using Equation 7. [59] h ¼ Jsc � Voc � FF p in (7) Where Jsc is the short circuit current density, Voc is the open-circuit voltage, FF is the fill factor, and the p in represents the input power.…”

Section: Current-voltage Measurementsmentioning

confidence: 99%

“…A detailed synthesis process of ZnO nanoparticles by using the microwave-assistant method was found in our previous work. [7] For Ag-doped ZnO nanoparticles, silver nitrate was used in different mole percentages (5 %, 10 %, 15 %, and 20 %). Prepared undoped and doped nanoparticles were grounded with ethanol and allowed to thoroughly mix for three days using a magnetic stirring.…”

Section: Experimental Section Preparation Of Undoped Ag-doped Zno Nan...mentioning

confidence: 99%

“…), and wide range of deposition processes (chemical bath deposition (CBD), chemical vapor deposition (CVD), sole-gel, microwave-assisted techniques, precipitation method, etc.). [5][6][7][8][9][10][11][12][13][14][15] Undoped ZnO possesses a direct wide bandgap of 3.37 eV and a comparatively larger free excitonic binding energy of about 60 meV. [16] To tune the optical band gap and enhance photo-catalytic activities, ZnO is widely doped with transition metals such as Nickel (Ni), Vanadium (V), Cobalt (Co), Manganese (Mn), Copper (Cu), Silver (Ag), etc.…”

Section: Introductionmentioning

confidence: 99%

“…), and wide range of deposition processes (chemical bath deposition (CBD), chemical vapor deposition (CVD), sole‐gel, microwave‐assisted techniques, precipitation method, etc.) [5–15] …”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Efficiency of Dye‐Sensitized Solar Cells (DSSCs) by Nanostructured Ag‐doped ZnO Electrodes

Rathnasekara

Hari

2022

ChemistrySelect

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Silver (Ag) ‐ doped ZnO nanoparticles (0 % to 20 %) were synthesized by the microwave method. The structural, optical, and electrochemical properties were observed through Transmission Electron Microscopy (TEM), X‐ray Diffraction (XRD), Energy Dispersive X‐ray (EDX), UV‐Visible spectroscopy, Photoluminescence, and Cyclic‐Voltammetry (C−V) techniques. The platinum metal counter electrode was replaced by using dip coating, spin coating, and electrochemical method electrodes. The best current‐voltage performance was exhibited by the 5 % Ag‐doped ZnO DSSCs constructed by the electrochemical method counter electrode with a conversion efficiency (η) of 6.19 %, open‐circuit voltage (Voc) of 0.58 V, short circuit current density (Jsc) of 19.12 mA/cm2 and fill factor of 55.08 %. This performance is superior to the counter electrodes made from the spin coating (1.45 %) and dip coating (0.91 %). The higher catalytic behavior of the electrochemical method counter electrode and appearing plasmons peaks in all Ag‐doped ZnO nanoparticles influence the enhancement of current density and overall conversion efficiency.

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Section: Current-voltage Measurementsmentioning

confidence: 99%

Section: Experimental Section Preparation Of Undoped Ag-doped Zno Nan...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancing the Efficiency of Dye‐Sensitized Solar Cells (DSSCs) by Nanostructured Ag‐doped ZnO Electrodes

Rathnasekara

Hari

2022

ChemistrySelect

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“…Zinc oxide nanoparticles (ZnO NPs) are attractive semiconductors because of their excellent physical properties, such as n-type semiconductors, excellent optical and electronic properties, high electronic mobility, fast recombination of electron-hole pairs, excellent photocatalytic activity, high thermal conductivity, and limited visible light absorbance [1,2]. The bandgap energy and exciton binding energy of the ZnO NPs are 3.37 eV and 60 meV, respectively [2,3]. ZnO has a stable wurtzite hexagonal structure with lattice constants a = 3.250 A ˚and c = 5.207 A ˚ [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen-related shallow donor on the physical and chemical properties of Ag-doped ZnO nanostructures

Al‐Bataineh

Ababneh

Bahti

et al. 2022

J Mater Sci: Mater Electron

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Silver-doped zinc oxide nanostructures (Ag/ZnO NSs) with Ag content of 0 wt%, 5 wt%, 10 wt%, and 20 wt% were synthesized using a hydrothermal technique. The prepared nanostructures were annealed at 500 °C for 2 h. The samples were characterized by using scanning electron microscopy, FTIR, X-ray diffraction (XRD), and electrical conductivity. FTIR spectra confirms the presence of hydrogen-related shallow donor defects in the Ag/ZnO NSs, which bind to the oxygen vacancy ($${\text{H}}_{\text{O}}$$ H O ) and consequently plays a significant role in the physicochemical properties of the metal oxide nanostructures. The $${\text{H}}_{\text{O}}$$ H O defects are blended to O- and Zn-polar Ag-doped ZnO NSs, depending on their polarity. XRD results verified that Ag/ZnO NSs have a polycrystalline hexagonal structure. Williamson–Hall methods were used to estimate the microstructural properties of polycrystalline nanostructures. The electrical conductivity increased from 0.60 to 1.10 µS/cm, and the bandgap energy decreased from 3.36 to 3.10 eV by increasing the Ag from 0 wt% up to 20 wt%.

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Optical, electronic, and structural properties of different nanostructured ZnO morphologies

et al. 2022

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Impedance spectroscopy of nanostructured ZnO morphologies

Cited by 6 publications

References 56 publications

Enhancing the Efficiency of Dye‐Sensitized Solar Cells (DSSCs) by Nanostructured Ag‐doped ZnO Electrodes

Enhancing the Efficiency of Dye‐Sensitized Solar Cells (DSSCs) by Nanostructured Ag‐doped ZnO Electrodes

Effect of hydrogen-related shallow donor on the physical and chemical properties of Ag-doped ZnO nanostructures

Optical, electronic, and structural properties of different nanostructured ZnO morphologies

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