Investigation of aluminum doping on structural and optical characteristics of sol–gel assisted spin-coated nano-structured zinc oxide thin films

Mia, M.N.H.; Habiba, Umme; Pervez, M. F.; Kabir, Humayun; Nur, Salahuddin; Hossen, Moha Feroz; Sen, Sapan Kumar; Hossain, M. Khalid; Iftekhar, Mohammad Arif; Rahman, M. Mahbubur

doi:10.1007/s00339-020-3332-z

Cited by 26 publications

(8 citation statements)

References 49 publications

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“…There are many approaches for the growth of ZnO nanostructures such as catalytic growth via vapor liquid solid (VLS) mechanism [ 21 , 22 ], thermal evaporation [ 23 , 24 , 25 ], pulsed laser deposition (PLD) [ 26 , 27 ], hydrothermal growth [ 28 , 29 , 30 , 31 ], rapid hydrothermal growth [ 32 , 33 , 34 ], and wet chemical processing [ 35 , 36 , 37 ], etc. The choice of the growth technique is dictated by the requirements of the application.…”

Section: Introductionmentioning

confidence: 99%

Toward the Growth of Self-Catalyzed ZnO Nanowires Perpendicular to the Surface of Silicon and Glass Substrates, by Pulsed Laser Deposition

et al. 2020

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Vertically-oriented zinc oxide (ZnO) nanowires were synthesized on glass and silicon substrates by Pulsed Laser Deposition and without the use of a catalyst. An intermediate c-axis oriented nanotextured ZnO seed layer in the form of nanowall network with honey comb structure allows the growth of high quality, self-forming, and vertically-oriented nanowires at relatively low temperature (<400 °C) and under argon atmosphere at high pressure (>5 Torr). Many parameters were shown to affect the growth of the ZnO nanowires such as gas pressure, substrate–target distance, and laser energy. Growth of a c-axis-crystalline array of nanowires growing vertically from the energetically favorable sites on the seed layer is observed. Nucleation occurs due to the matching lattice structure and the polar nature of the ZnO seed layer. Morphological, structural, and optical properties were investigated. X-ray diffraction (XRD) revealed highly c-axis aligned nanowires along the (002) crystal plane. Room temperature photoluminescence (PL) measurements showed a strong and narrow bandwidth of Ultraviolet (UV) emission, which shifts to lower wavelength with the increase of pressure.

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Section: Introductionmentioning

confidence: 99%

Toward the Growth of Self-Catalyzed ZnO Nanowires Perpendicular to the Surface of Silicon and Glass Substrates, by Pulsed Laser Deposition

et al. 2020

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“…4 for both the undoped and the doped AlO thin films had same trend of transmittance i.e., it decreased monotonically by increasing the doping ratio up 7wt% and then started to increase. Mia et al pointed out that optical band gaps of Al doped ZnO thin films showed increase from 3.30 to 3.37eV by increasing the doping ratio from 0 to 8mol% [40]. Bandgap shifts are the result of two competing factors.One is the bandgap narrowing and the other is the Burstein-Moss effect.…”

Section: Experimental Work and Proceduresmentioning

confidence: 99%

Impact of Aluminum Oxide Content on the Structural and Optical Properties of ZnO: AlO Thin Films

Abass

Hasan

2021

IJP

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AlO-doped ZnO nanocrystalline thin films from with nano crystallite size in the range (19-15 nm) were fabricated by pulsed laser deposition technique. The reduction of crystallite size by increasing of doping ratio shift the bandgap to IR region the optical band gap decreases in a consistent manner, from 3.21to 2.1 eV by increasing AlO doping ratio from 0 to 7wt% but then returns to grow up to 3.21 eV by a further increase the doping ratio. The bandgap increment obtained for 9% AlO dopant concentration can be clarified in terms of the Burstein–Moss effect whereas the aluminum donor atom increased the carrier's concentration which in turn shifts the Fermi level and widened the bandgap (blue-shift). The engineering of the bandgap by low concentration of AlO dopant makes ZnO: AlO thin films favorable for the fabrication of optoelectronic devices. The optical constants were calculated and was found to be greatly affected by the increasing the doping ratio.

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“…can further enhance the conductivity of ZnO up to about 10 −4 S/cm by donor electrons [ 9 , 10 ]. Such thin films are widely prepared using sol-gel route because of versatile compositional control, affordable cost, homogeneity in molecular level for mixing of liquid precursors and lower crystallization temperature [ 11 ]. In alkoxide route, organo-metallic precursors are expensive and sometimes hazardous.…”

Section: Introductionmentioning

confidence: 99%

UV-irradiated sol-gel spin coated AZO thin films: enhanced optoelectronic properties

Khan

Neha

Billah

2022

Heliyon

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Thin films of transparent conductive Al doped ZnO (AZO) thin films were produced via sol-gel spin coating route. Structural, optical, and electrical properties were explored for several dopant concentrations. Formation of crystalline AZO was verified by X-ray Diffraction (XRD) Analysis and structural analysis were carried out later from the XRD data. Highest band gap of 3.67 eV was found for 2 mol % AZO thin films. The average transmittance was found to be 84.19% in the visible spectra for the corresponding thin films. 2 mol% AZO also exhibited a minimum resistivity of 2.05 Ω-cm with a maximum value of figure of merit. Prolonged UV irradiation was applied to 2 mol % AZO thin films prior to annealing. It significantly modified the surface morphology of the film and provided shielding near UVA (315-378 nm) spectrum. This also enhanced the conductivity of the thin film by 3fold compared to non-UV treated sample and decreased optical band gap significantly.

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Investigation of aluminum doping on structural and optical characteristics of sol–gel assisted spin-coated nano-structured zinc oxide thin films

Cited by 26 publications

References 49 publications

Toward the Growth of Self-Catalyzed ZnO Nanowires Perpendicular to the Surface of Silicon and Glass Substrates, by Pulsed Laser Deposition

Toward the Growth of Self-Catalyzed ZnO Nanowires Perpendicular to the Surface of Silicon and Glass Substrates, by Pulsed Laser Deposition

Impact of Aluminum Oxide Content on the Structural and Optical Properties of ZnO: AlO Thin Films

UV-irradiated sol-gel spin coated AZO thin films: enhanced optoelectronic properties

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