Characterization and studying of ZnO thin films deposited by spray pyrolysis: Effect of annealing temperature

Belkhalfa, Hakim; Ayed, H.; Hafdallah, Abdelkader; Aida, M.S.; Ighil, R. Tala

doi:10.1016/j.ijleo.2015.11.126

Cited by 49 publications

(19 citation statements)

References 13 publications

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“…The quality of the ZnO films is typically determined regarding surface uniformity, transparency, conductivity, and crystalline orientation [27]. This quality is strongly affected by many factors such as the sol aging time [28,29], the concentration of the precursor [30][31][32][33], and the preheating and the postannealing temperatures [31,34,35]. In our previous paper [19], we studied the influence of the precursor concentration and annealing treatment on the structural and optical properties of sol-gel ZnO thin films.…”

Section: Introductionmentioning

confidence: 99%

Effect of Solvents and Stabilizer Molar Ratio on the Growth Orientation of Sol-Gel-Derived ZnO Thin Films

Bekkari

Jaber²,

Labrim

et al. 2019

International Journal of Photoenergy

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This work targets to control the growth orientation of sol-gel-derived ZnO thin films in order to allow different modes of excitation (longitudinal and transverse) when targeted to be used in piezoelectric applications. For that, the effect of solvents and stabilizer molar ratio on the structural and optical characteristics of the obtained films is investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis spectrophotometry. The XRD results show clearly that the synthesized films exhibit hexagonal wurtzite structure without any secondary phases and that the crystallite average size, estimated by the Scherrer formula, is ranged between 13 and 30 nm. The main finding of this work is to show that the control of the crystalline growth orientation is possible simply by varying the solvent nature and/or the stabilizer molar ratio. These later parameters are therefore considered as key factors when seeking to develop the ZnO-based transducers. Actually, the ZnO thin films synthesized with propanol as solvent are oriented only along the c-axis; meanwhile, when using the isopropanol or ethanol, other preferential orientations appear. Additionally, the effect of MEA molar ratio (r) has been studied on the propanol-derived films (the unfavorable case). It has been found that this parameter has a direct effect on the crystalline growth orientation of these films and that a new preferential orientation (100) appears at low r. On the other hand, SEM images show the formation of homogeneous nanocrystalline thin films with an average grain size ranged between 19 and 35 nm. Moreover, the ZnO thin films exhibit a high transparency in the visible region, and the measured transmittance is ranged from 85 to 97%. However, the change of ZnO film orientation has no significant effect on the direct bandgap energy which is closed to 3.30 eV.

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Section: Introductionmentioning

confidence: 99%

Effect of Solvents and Stabilizer Molar Ratio on the Growth Orientation of Sol-Gel-Derived ZnO Thin Films

Bekkari

Jaber²,

Labrim

et al. 2019

International Journal of Photoenergy

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“…Various techniques have been used to prepare the ZnO thin films. These techniques include the chemical vapor deposition [10], electrochemical deposition [11], spray pyrolysis [12][13][14], sol-gel method [15][16][17]. Among the techniques mentioned above, the sol-gel process has attracted a great attention due to its excellent homogeneity, low cost, easy control of doping, and chemical composition, good reproducibility, lower crystallization temperature and large-area coating capability with high adhesion on different types of substrates [18].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

et al. 2019

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Undoped and Ag-doped ZnO thin films with different silver concentrations (0, 1, 3, and 7 wt%) were synthesized by sol-gel method and deposited onto glass substrate by dip-coating technique. Zinc acetate dehydrate and silver nitrate were used as starting materials. 2-Methoxyethanol and ethanolamine were used as solvent and stabilizer. Characterization by X-ray diffraction has revealed that the undoped and Ag-doped ZnO are polycrystalline, and have the wurtzite hexagonal structure with a preferred orientation along c-axis. The nanometric size (27-34 nm) of ZnO crystallites varies with the concentration of Ag. The surface morphology analysis, by atomic force microscopy and scanning electron microscopy, depicts a homogeneous dispersion of ZnO crystallites in the form of randomly spread wrinkles-like formation. The Raman spectroscopy confirms the Ag incorporation in the ZnO lattice. All films exhibit a transmittance greater than 75% in the visible region, and a sharp absorption band at 325 nm corresponding to the fundamental absorption edge. The room-temperature photoluminescence spectra of the prepared thin films display a strong ultraviolet band at 380 nm originated from excitons recombination, and four bands in the visible region at 430 nm (violet), 460 nm, 480 nm (blue) and 530 nm (green) from created defect levels in the band gap. These synthesized materials may be potential candidates in the manufacture of devices using short wavelengths.

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“…Film tipis ZnO maupun ZnO doping telah dideposisikan dengan berbagai macam teknik, seperti sputtering [5][6][7] , MBE (molecular beam epitaxy) [8] , CVD (chemical vapor deposition) [9] , MOCVD (metal organic chemical vapor deposition) [4] , electrochemical deposition [10] , pulsed laser deposition [11] , sol-gel [12][13] dan spray [12,[14][15][16][17][18] . Dibandingkan dengan teknik lain, spray merupakan teknik yang sederhana, tidakvakum dan murah [17] .…”

Section: Pendahuluanunclassified

“…Peningkatan suhu perlakuan panas (500 dan 600 °C) memperlihatkan puncak-puncak difraksi yang sesuai dengan bidang kristal ZnO (100), (002), (101), (102), (110), (103) and (112) (ICDD 01-078-3315). Hal tersebut mengindikasikan bahwa film tipis AZO yang dihasilkan adalah polikristal dengan struktur heksagonal wurtzite [18] . Puncak difraksi dari hasil XRD menunjukkan tidak ada fase lain yang terbentuk.…”

Section: Hasil Dan Diskusiunclassified

Perlakuan Panas Ganda pada Fabrikasi Film Tipis AZO Nanokristal dengan Teknik Spray : Studi XRD [Double Heat Treatments On The Fabrication Of Nanocrystalline Azo Thin Films By Spray Technique: XRD Studies]

Aryanto¹,

Husniya²,

Sudiro³

et al. 2017

metal.

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IntisariKarakterisasi XRD telah digunakan untuk mempelajari efek perlakuan panas tunggal dan ganda pada fabrikasi film tipis ZnO doping Al (AZO) nanokristal yang dideposisikan dengan teknik spray. Pada perlakuan panas tunggal, film tipis AZO nanokristal dengan struktur polikristal heksagonal wurtzite terbentuk pada suhu 500 °C dan 600 °C. Peningkatan suhu menyebabkan peningkatan ukuran kristal dan pengurangan kerapatan dislokasi. Perlakuan panas ganda pada film tipis AZO nanokristal mengakibatkan perubahan kecil pola difraksi. Hal ini mengindikasikan bahwa parameter kristal film tipis AZO nanokristal berubah setelah mendapat perlakuan panas kedua. Film tipis AZO nanokristal yang diberikan perlakuan panas pada suhu 500 °C dalam lingkungan udara dan dilanjutkan hingga suhu 600 °C dalam kondisi vakum memperlihatkan bahwa rata-rata ukuran kristal berkurang dan muncul cacat kristal (regangan dan kerapatan dislokasi meningkat). Hasil yang berbeda ditunjukkan pada film tipis AZO nanokristal yang diberikan perlakuan panas pada suhu 600 °C dalam lingkungan udara kemudian dilanjutkan dengan suasana vakum. Kualitas kristal film tipis AZO nanokristal meningkat, yang diindikasikan dengan peningkatan ratarata ukuran kristal, berkurangnya nilai regangan dan kerapatan dislokasi. Berdasarkan pada hasil yang didapat, perlakuan panas ganda berpengaruh pada parameter dan kualitas kristal film tipis AZO nanokristal yang dideposisikan dengan teknik spray.

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Characterization and studying of ZnO thin films deposited by spray pyrolysis: Effect of annealing temperature

Cited by 49 publications

References 13 publications

Effect of Solvents and Stabilizer Molar Ratio on the Growth Orientation of Sol-Gel-Derived ZnO Thin Films

Effect of Solvents and Stabilizer Molar Ratio on the Growth Orientation of Sol-Gel-Derived ZnO Thin Films

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

Perlakuan Panas Ganda pada Fabrikasi Film Tipis AZO Nanokristal dengan Teknik Spray : Studi XRD [Double Heat Treatments On The Fabrication Of Nanocrystalline Azo Thin Films By Spray Technique: XRD Studies]

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