Structural, optical and electrochemical transient photoresponse properties of ZnO/Ga2O3 nanocomposites prepared by two-step CVD method

Jubu, Peverga R.; Yam, F.K.; Kyesmen, Pannan I.

doi:10.1016/j.ijhydene.2021.07.165

Cited by 17 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The crystallite size D, dislocation density δ, microstrain ε and stacking fault SF are estimated using Eqs. 1-4 [19][20][21][22][23]. The structural parameters are estimated from the most preferential growth orientation of the films, that is the (210) peak.…”

Section: Resultsmentioning

confidence: 99%

“…Electron-hole pairs are generated in the photoactive MoO3 layer upon UV light illumination by Xenon lamp. The photogenerated electrons in the valence band (VB) of the semiconducting material are excited to the conduction band (CB) and then transferred to the collecting Si substrate, leaving behind holes in the VB [20,21] (Fig. 6).…”

Section: Impedance Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic Properties of Molybdenum Oxide Photoelectrode Synthesized by Spray Pyrolysis Method

Jubu

Yusuf

Yusof

et al. 2023

Preprint

View full text Add to dashboard Cite

The present work reports the photocatalytic properties of pyrolyzed molybdenum oxide thin film. Microstructural analysis reveals clustered nanoaggregates. Structural analysis shows polycrystalline 𝛼-MoO3 phase. The crystallite size, dislocation density, microstrain and stacking faults are found to be 41.27 nm, 5.87 ×10−4 lines/cm2, 8.41 ×10−4 and 1.78, respectively. The optical bandgap is found to be 3.20 eV. Linear sweep voltammetry measurement in 1 M KOH electrolyte reveal significant photocurrent density of 992.39 𝜇A/cm2 at bias of 1 V vs. Ag/AgCl. The reasonable performance of the device suggest that the spray pyrolysis method is promising for preparing photosensitive MoO3 films for photoelectrochemical measurement.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Impedance Spectroscopymentioning

confidence: 99%

Photocatalytic Properties of Molybdenum Oxide Photoelectrode Synthesized by Spray Pyrolysis Method

Jubu

Yusuf

Yusof

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The key properties that can potentially be estimated from the DR measurement, are the optical bandgap energy ( ) and the absorption coe cient ( ) [2,7]. These optical parameters are fundamental in optoelectronics (light-dependent devices) [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Considerations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc plot

Jubu,

Obaseki,

Ajayi

et al. 2024

J Opt

View full text Add to dashboard Cite

The optical diffuse re ectance data of a semiconductor material is usually converted into the Kubelka-Munk function before proceeding to process the conventional Tauc's plot from which optical bandgap energy can be determined. Firstly, it is conventional/ customary to convert the percentage re ectance (R ∞ (%)) data which is obtained from UV-vis measurement into an equivalent re ectance (R ∞ ) that range between 0 and 1 before processing the Tauc's plot. Secondly, the Kubelka-Munk function is usually multiplied by the incident photon energy, hv, to produce an all-elements/ comprehensive Tauc's plot. Literature is scarce to convincingly demonstrate that a correct bandgap value can also be obtained from the Tauc's plot that is derived directly from the (R ∞ (%)) data without having to convert to R ∞ . Also, publication is rarely available to demonstrate that a correct bandgap value can be determined without having to multiply the Kubelka-Munk function by hv. Investigation shows diminutive differences in the bandgap values estimated from the R ∞ (%)-based Tauc's plots and the equivalent R ∞ -based Tauc's plots. This suggests that either of the methods can be employed for a proper bandgap estimate. Additionally, a comparison between the magnitude of the bandgap energies determined from the comprehensive Tauc's plot and when the Kubelka-Munk function is not multiplied by shows insigni cant differences in the estimated values. This suggests that either of the two methods can be used to obtain a reliable bandgap for direct and indirect optical gap semiconductors.

show abstract

The Structural Properties and Photoelectrocatalytic Response of Mn‐Doped Hematite Photoanodes Prepared via a Modified Electrodeposition Approach

Kyesmen,

Simfukwe,

Jubu

et al. 2024

ChemElectroChem

View full text Add to dashboard Cite

The concept of nanostructuring and doping of hematite (α‐Fe2O3) photoanodes have been widely engaged towards improving their photoelectrocatalytic (PEC) response. Here, a FeCl3‐based solution was modified with 0–10 % polyethylene glycol (PEG) 400 and used as an electrolyte for the electrodeposition of nanostructured α‐Fe2O3 thin films. The electrolyte containing 10 % PEG was further used to prepare Mn‐doped α‐Fe2O3 films by adding 1, 3, 6, and 10 % of MnCl2.4H2O with respect to the molarity of FeCl3. The addition of 10 % PEG into the electrolyte limited particle agglomeration and yielded the best PEC response among the pristine films. The 3 % Mn‐doped α‐Fe2O3 photoanodes produced the highest photocurrent, yielding 2.2 and 6.1‐fold photocurrent enhancement at 1.23 V and 1.5 V vs. RHE respectively, over the pristine films. The improved PEC response is linked to the reduced particle agglomeration and improved charge transport properties observed for the films. Density functional theory (DFT) calculations of the formation energies yielded negative values for the Mn‐doped α‐Fe2O3, which implies that the materials are thermodynamically stable after doping. This work introduces a new pathway for the electrodeposition of doped α‐Fe2O3 films and underscores the roles of Mn‐doping in boosting their PEC response.

show abstract

Structural, optical and electrochemical transient photoresponse properties of ZnO/Ga2O3 nanocomposites prepared by two-step CVD method

Cited by 17 publications

References 36 publications

Photocatalytic Properties of Molybdenum Oxide Photoelectrode Synthesized by Spray Pyrolysis Method

Photocatalytic Properties of Molybdenum Oxide Photoelectrode Synthesized by Spray Pyrolysis Method

Considerations about the determination of optical bandgap from diffuse reflectance spectroscopy using the tauc plot

The Structural Properties and Photoelectrocatalytic Response of Mn‐Doped Hematite Photoanodes Prepared via a Modified Electrodeposition Approach

Contact Info

Product

Resources

About