scholarly journals Effect of the Substrate Movement on the Optical Properties of ZnO Thin Films Deposited by Ultrasonic Spray Pyrolysis

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Ebru Gungor ◽  
Tayyar Gungor
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Spray Pyrolysis ◽  
Quartz Substrate ◽  
Compressive Strain ◽  
Ultrasonic Spray Pyrolysis ◽  
Film Deposition ◽  
Zno Thin Films ◽  
Zno Films ◽  
Ultrasonic Spray

Using a modified ultrasonic spray pyrolysis (USP) system, ZnO thin films were deposited on the substrate moved back and forth (ZO1) and rotated (ZO3) as well as fixed (ZO2) in the conventional USP technique. Prepared thin films are pure ZnO with a preferred crystalline orientation of (0 0 2) in the hexagonal wurtzite structure. Diffraction angle shift implies a decrease lattice parameter alongc-axis anda-axis 0.2% and 0.3%, respectively. Maximum strain has been found for ZO1 which is about (−) 0.17%. These strain values show that presence of compressive strain due to moving substrates as depositing ZnO films. The film deposition process on the rotated quartz substrate is provided to obtain the thinner film. The grain size and root-mean- square value of roughness increase with thickness. Strong UV emission was observed at ∼390 nm assigned to the band gap transition from photoluminescence measurements. Energy shifted about 39 meV for ZO3 sample with respect to that of ZO2 film deposited in conventional USP system. This behaviour is confirmed with (002) diffraction peak shifting. So, the compressed lattice will provide a wider band gap for these films.E2phonon frequency values have not given a considerable shifting.

Study on the growth and optical properties of ZnO thin films fabricated by ultrasonic spray pyrolysis

2018 ◽  
Vol 32 (29) ◽  
pp. 1850351 ◽  
Author(s):  
Weiguang Yang ◽  
Zhen Yang ◽  
Ding Li ◽  
Xiaoying Zhang ◽  
Ziliang Zhou ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spray Pyrolysis ◽  
Quartz Substrate ◽  
Ultrasonic Spray Pyrolysis ◽  
Zno Thin Films ◽  
Zno Films ◽  
Expansion Formula ◽  
Ultrasonic Spray ◽  
Structure Formula

In this paper, ZnO nanofilms are prepared on quartz substrate by ultrasonic spray pyrolysis (USP) technology. The effects of substrate temperature and deposition time on the micro-structural, morphological and optical properties of ZnO thin films are investigated in detail. Measurements indicate that the growth process of the film is as follows: Micro grains accumulation [Formula: see text] grains’ expansion [Formula: see text] grow into certain nanostructures under different temperature. Nanostructures of the film are as follows: Irregular broken hexagonal-like structure ([Formula: see text]C); coexisting of broken hexagonal- and sheet-like structure (450–500[Formula: see text]C); regular closed packed sheets-like structure ([Formula: see text]C). In addition, all results show that RMS roughness of the films is less than 20 nm. Moreover, the visible transmittance of these samples is higher than 90%. Which display that ZnO films with low roughness and excellent optical properties can be also fabricated by low-cost USP method.

Preparation of ferromagnetic N–Mn codoped ZnO thin films by ultrasonic spray pyrolysis

2016 ◽  
Vol 28 (1) ◽  
pp. 426-434
Author(s):  
Canyun Zhang ◽  
Jinfang Kong ◽  
Fengchao Wang ◽  
Jun Zou ◽  
Yaoqing Huang
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Zno Thin Films ◽  
Ultrasonic Spray

Study on aluminum concentration on optical and electrical properties of AZO thin films fabricated by ultrasonic spray pyrolysis

2019 ◽  
Vol 33 (22) ◽  
pp. 1950246
Author(s):  
Weiguang Yang ◽  
Miao He ◽  
Liu Yang ◽  
Ziliang Zhou ◽  
Xiaoying Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Spray Pyrolysis ◽  
Quartz Substrate ◽  
Visible Region ◽  
Ultrasonic Spray Pyrolysis ◽  
Aluminum Concentration ◽  
Near Band Edge ◽  
Band Edge Emission ◽  
Ultrasonic Spray

In this work, transparent and conductive Al-doped ZnO (AZO) nanofilms were prepared on quartz substrate by ultrasonic spray pyrolysis (USP) method. The effects of Al/Zn atomic ratios on the micro-structural, morphological, optical photoluminescence and electrical properties of AZO thin films were effectively investigated. All the prepared samples showed hexagonal wurtzite structure. The scanning electron microscopy (SEM) showed that the surface morphology of all samples changed with the substrate temperature. The average transmittance of all AZO samples was higher than 85% in the visible region. The photoluminescence (PL) spectrum of the samples showed that the near band edge emission in PL spectra shifted to shorter wavelengths with increasing Al-doped concentration. The lowest sheet resistance was obtained for the samples prepared with 4% at. Al-doped value. The electrical conductivity of AZO films was improved by Al doping, which allowed their use as optoelectronic materials.

scholarly journals Structural and Photoluminescence Properties of ZnO Thin Films Deposited by Ultrasonic Spray Pyrolysis

2018 ◽  
Vol 22 (1) ◽  
pp. 13 ◽  
Author(s):  
Iwan Sugihartono ◽  
Erfan Handoko ◽  
Vivi Fauzia ◽  
Artoto Arkudato ◽  
Lara Permata Sari
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Zno Thin Films ◽  
Photoluminescence Properties ◽  
Ultrasonic Spray

Effect of Solution Concentration on ZnO/ZnAl2O4 Nanocomposite Thin Films Formation Deposited by Ultrasonic Spray Pyrolysis on Glass and Si(111) Substrates

2020 ◽  
Vol 63 ◽  
pp. 10-30
Author(s):  
Sabrina Iaiche ◽  
Chahra Boukaous ◽  
David Alamarguy ◽  
Abdelkader Djelloul ◽  
Djamel Hamana
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Near Infrared ◽  
Ultrasonic Spray Pyrolysis ◽  
Solution Concentration ◽  
Molar Ratio ◽  
Zno Films ◽  
Glass Layer ◽  
Ultrasonic Spray ◽  
Vis Spectroscopy

A complex ZnO/ZnAl2O4 heterostructures thin films on glass and Si (111) substrates have been successively obtained by a soft ultrasonic spray pyrolysis (USP) method deposition using the Zn/Al molar ratios concentrations of 0.07/0.13 and 0.1/0.1, respectively. According to (XRD) an ordered zinc oxide (ZnO) and zinc aluminate (ZnAl2O4) structures deposited onto glass from the air annealing at 500 °C during 2 hours was observed and confirmed by the (EDX), (FTIR) and Raman spectroscopy techniques. The estimated crystallites size and stress values of ZnO and ZnAl2O4 in the ZnO/ZnAl2O4/glass film were 19 nm/0.469 GPa and 11 nm/-0.292 GPa, respectively. The lower Zn/Al molar ratio around 0.035/0.06 produced only ZnO as a single phase, suggesting the Al insufficient quantity. The Si (100) substrate with 0.07 Zn molarity conducted to the Zn2SiO4/ZnO/ZnAl2O4 composite. The Raman integrated intensity bands of ZnO and ZnAl2O4 increases with increasing Zn to Al molar ratio (0.1/0.1 comparatively to 0.07/0.13). The ZnO&ZnAl2O4 crystallinity enhances as Zn molarity increases. The ZnO films in the composites grow with (002) texture. The TC(hkl) value indicated that ZnAl2O4 in the ZnO/ZnAl2O4/glass layer is polycrystalline preferentially oriented along the (311) plane. Spinel ZnAl2O4 oxide onto Si (111) substrate grown according to the (220) orientation. Crystallites are larger in ZnO/ZnAl2O4/Si than in ZnO/ZnAl2O4/glass. The ZnO/ZnAl2O4 film onto glass substrate is transparent in the visible and near infrared regions and sensitive to UV absorption, as characterized by UV-Vis spectroscopy. The ZnO and ZnAl2O4Egvalues in the ZnO/ZnAl2O4/glass composite were 3.25 and 3.88 eV, respectively.

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