Study of the surface topography and optical properties of ZnO and AZO, CZO, and CAZO thin films (in room temperature and annealed at 500 °C)

Rahimi, Nasim; Dalouji, Vali

doi:10.1080/15421406.2022.2092371

Cited by 4 publications

(3 citation statements)

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“…The RMS roughness of as-deposited ZnO films and Al, Cu, Cu-Al doped with ZnO films was 7.134, 4.679, 5.141 and 1.187 nm, respectively, and the RMS roughness of ZnO films and Cu, Al and Cu-Al doped with ZnO films in 500°C was obtained 8.098, 3.066, 5.158 and 5.063 nm, respectively. With decreasing RMS roughness of films, the scattering of light on surface of films were decreased and then the absorption spectra of films, as confirmed in the previous works (Rahimi et al , 2020a; Rahimi et al , 2020b; Dalouji et al , 2020; Dalouji and Rahimi., 2022).…”

Section: Resultssupporting

confidence: 82%

“…In previous reports (Dejam et al , 2019; Dalouji et al , 2019; Solaymani et al , 2017), EDAX spectra for films were showed. The spectra were reported in line scan mode, and the presence of characteristic peaks for O, Zn and Cu and Al peaks in ZnO films were observed (Rahimi et al , 2020a; Rahimi et al , 2020b; Dalouji et al , 2020; Dalouji and Rahimi, 2022).…”

Section: Resultsmentioning

confidence: 99%

“…The last of these permits the synthesis of AZO thin films at low temperatures (Mickan et al , 2016; Wang et al , 2011; Kim and Kim., 2011) and over flexible substrates (Li et al , 2014). In previous papers, we investigated topology, optical, structural properties and also the optical dispersion parameters, such as absorption coefficients in CAZO films, CZO films, and the variations of these parameters were evaluated in terms of annealing temperature (Rahimi et al , 2020a; Rahimi et al , 2020b; Dalouji et al , 2020a; Dalouji and Rahimi., 2022). The present reports are study of the morphological properties using 3D and 2D AFM images, optical and electrical properties in the wavelength range of 200–2,500nm for ZnO, AZO, CZO and CAZO films (thickness about 230 nm) prepared by RF magnetron sputtering in the room temperature for as-deposited films and films annealed at 500°C in argon atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Electrical, morphological, optical and mathematical simulations equations studies in CAZO, CZO, AZO and ZNO films

Dalouji,

Rahimi

2023

SSMT

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Purpose In this paper, it can be seen from AFM images of the as-deposited ZnO and CZO films, and the particle size and shape are not clear, while by increasing annealing temperature, they become distinguishable. By increasing temperature to 600°C, ZnO and CZO, CAZO and aluminum-doped zinc oxide (AZO) films particles became almost spherical. Due to high content of Cu in CZO target, and of Al in AZO target which was 5% weight ratio, doping plays a great role in the subject. Therefore, the annealing processing strongly affect the size and the shape of nanoparticles. Design/methodology/approach In this paper, the authors tried to study, in detail, nobel optical characterizations of ZnO films doped by transition metals in different annealing temperature. The authors found that the values of skin depth, optical density, electron–phonon interaction, steepness parameter, band tail width, direct and indirect carriers transitions and the dissipation factor, free carriers density and roughness of films affect the optical properties, especially the optical absorptions of ZnO films doped by transition metals. Also these properties were affected by annealing temperatures. The authors also found that topography characterizations strongly were affected by these parameters. Findings The CZO films have maximum value of coordination number ß, with considering NC = 4, Za = 2, Ne = 8. The CZO films annealed at 500 °C have maximum value of optical density. The as-deposited CAZO films have maximum value of steepness parameters in about of 0.13 eV. The as-deposited AZO films have maximum value of dispersion energy Ed in about of 5.75 eV. Optical gap and disordering energy plots of films can be fitted by linear relationships Eg = 0.49 + 0.2 EU and Eg = 0.52 + 0.5 EU, respectively. Originality/value With considering Nc = 4, Za = 2, Ne = 8 for ZnO films, coordination number ß has maximum value of 0.198. CZO nanocomposites films annealed at 500°C have maximum value of optical density. Different linear fitting of ln (α) for films were obtained as y = Ax + B where 5<A < 17 and 5<B < 12. As-deposited CAZO nanocomposites films have minimum value of electron phonon interaction in about of 4.91 eV. Optical gap and disordering energy plots can be fitted by linear relationships Eg = 0.49 + 0.2 EU and Eg = 0.52 + 0.5 EU for as-deposited films and films annealed at 500°C, respectively. Steepness parameters of as-deposited CAZO nanocomposites films have maximum value of 0.13 eV. Dispersion energy Ed for as-deposited AZO nanocomposites films has maximum value of 5.75 eV.

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Section: Resultssupporting

confidence: 82%