Structural modification and band gap tailoring of zinc oxide thin films using copper impurities

Tyona, M. D.; Osuji, R. U.; Asogwa, P. U.; Jambure, S.B.; Ezema, Fabian I.

doi:10.1007/s10008-017-3533-3

Cited by 33 publications

(48 citation statements)

References 40 publications

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“…However, the absorption edge for AZO films with 2 and 5 at.% Al concentrations were red-shifted (to 430 and 450 nm, respectively). This could be attributed to the enhancement in optical properties induced by Al doping [29,30,31]. The optical band gap energy (E g ) was estimated from Tauc plot ( Figure 6) using Tauc's relationship between the absorption coefficient, α, and the photon energy, hν as shown in Eq.…”

Section: Surface Morphological Studiesmentioning

confidence: 99%

“…Burstein-moss pointed out that an increase in the Fermi level in the conduction band of degenerate semiconductors leads to widening of the energy band (blue shift) [29,30]. Enhancement of band gap also ensures the successful doping of Al in the ZnO thin films [29,30,31].…”

Section: Optical Characterizationsmentioning

confidence: 99%

“…It seems that such formation of donor levels compensates the Burstein-Moss effect and results in the narrowing of the effective band gap of AZO. A reduction of stress on the film giving rise to widening of the band gap for 2 at.% Al concentration may also be due to enhanced thickness [30,31] of AZO film which may have some contribution to the observed blue-shift in the band gap [10]. Therefore the optical band gap of the AZO makes a peak increase at Al:Zn = 2 at.% which may obviously be the optimum doping concentration for AZO.…”

Section: Optical Characterizationsmentioning

confidence: 99%

See 2 more Smart Citations

Photovoltaic Properties of Aluminum Doped Zinc Oxide Electrodes Based on Variation of Aluminum Impurities in the Semiconductor

Tyona¹,

Osuji²,

Lokhande³

et al. 2018

JMPC

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Photoelectrochemical (PEC) solar cell studies of Al doped zinc oxide (AZO) thin film electrodes has been carried out by photocurrent-voltage (I-V) characteristic. The concentration of Al in ZnO was varied between 1-5 at.% in order to study the effect of the variation on the photovoltaic performance of the electrodes. The currentvoltage (I-V) characteristics measured in the dark and under 80 W simulated illumination revealed enhanced PV performance for the AZO electrodes in contrast to the undoped electrode. The best response was achieved for AZO electrode with 2 at.% Al concentration thus, recording higher conversion efficiency and fill factor. This is a clear indication that AZO electrodes are superior to undoped ZnO in PV applications. The remarkable enhanced properties of Al doping on ZnO were carefully studied by means of thickness measurement, X-ray diffraction (XRD), scanning electron microscope (SEM) and UV-Vis spectroscopy, and the results were in good agreement, and confirmed that AZO thin film electrodes are better for PV applications than undoped ZnO semiconductor in sodium sulphate (Na 2 SO 4 ) electrolyte.

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Section: Surface Morphological Studiesmentioning

confidence: 99%

Section: Optical Characterizationsmentioning

confidence: 99%

Section: Optical Characterizationsmentioning

confidence: 99%

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Photovoltaic Properties of Aluminum Doped Zinc Oxide Electrodes Based on Variation of Aluminum Impurities in the Semiconductor

Tyona¹,

Osuji²,

Lokhande³

et al. 2018

JMPC

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“…Figure 2 illustrates the various synthetic techniques (chemical as well as physical) that are generally used to grow compound and alloys of ZnO. The choice of a particular technique would be guided by some factors such as the application intended for the synthesis, effectiveness of the technique and cost implication [10,11]. ZnO has been identified as one of the semiconductors with the largest number of novel nanostructures such as nanocombs, nanorings, nanohelixes/nanosprings, nanobelts, nanowires, nanorods, nanotubes, nanocages, etc., with a wide range of technological applications [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…In several applications such as optoelectronics, ZnO can be used as a complement or alternative to some semiconductors such as GaN, and many researches are ongoing globally to further improve the properties of the semiconductor [10]. Trying to control the unintentional n-type conductivity and to achieve p-type Doped Zinc Oxide Nanostructures for Photovoltaic Solar Cells Application DOI: http://dx.doi.org /10.5772/intechopen.86254 conductivity are such famous research themes.…”

Section: Introductionmentioning

confidence: 99%

Doped Zinc Oxide Nanostructures for Photovoltaic Solar Cells Application

Tyona¹

2019

Zinc Oxide Based Nano Materials and Devices

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Zinc oxide and doping effects of Cu on its structural, morphological, optical, and surface wettability properties and the consequent influence on photoelectrochemical solar cell performance has been reviewed. Cu dopant in the doping solution is varied in the range of 1 to 5 at.% which significantly affected the properties of ZnO. Slight changes in the lattice parameters of the Cu-doped zinc oxide (CZO) electrodes were reported, due to the successful substitution of Zn 2+ by Cu 2+ and also enhancement in crystallinity of the films at 3 at.% Cu due to reduction in crystallographic defects in the film. Surface morphologies were reported with densely grown nanorods over the varied range of Cu, with 3 at.% having the densest microstructures with average diameter approximately 125 nm. A review of optical properties indicated significant enhancement in absorption edge of approximately 60 nm into the visible band for the nanorods with 3 at.% Cu content due to light scattering. Optical energy band-gaps decrease from 3.03 to 2.70 eV with Cu doping. Surface wettability was adjudged hydrophilic for all the films, implying high porosity and water contact angles depended on Cu content. Photoelectrochemical cell performance indicated an n-type photoactivity in sodium sulfate (Na 2 SO 4) electrolyte, which motivates to check its feasibility in solar cell applications.

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Doped Metal Oxide Thin Films for Dye-Sensitized Solar Cell and Other Non-Dye-Loaded Photoelectrochemical (PEC) Solar Cell Applications

Tyona

2021

Chemically Deposited Nanocrystalline Metal Oxide Thin Films

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Structural modification and band gap tailoring of zinc oxide thin films using copper impurities

Cited by 33 publications

References 40 publications

Photovoltaic Properties of Aluminum Doped Zinc Oxide Electrodes Based on Variation of Aluminum Impurities in the Semiconductor

Photovoltaic Properties of Aluminum Doped Zinc Oxide Electrodes Based on Variation of Aluminum Impurities in the Semiconductor

Doped Zinc Oxide Nanostructures for Photovoltaic Solar Cells Application

Doped Metal Oxide Thin Films for Dye-Sensitized Solar Cell and Other Non-Dye-Loaded Photoelectrochemical (PEC) Solar Cell Applications

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