Optical characterizations and refractive index dispersion parameters of annealed TiO2 thin films synthesized by RF-sputtering technique at different flow rates of the reactive oxygen gas

被引：123
作者：
Hassanien, A. S. [1 ,2 ,5 ]
Akl, Alaa A. [3 ,4 ]
机构：
[1] Benha Univ, Fac Engn Shoubra, Engn Math & Phys Dept, Cairo 11629, Egypt
[2] Shaqra Univ, Fac Educ Afif Govt, Phys Dept, Afif 11921, Saudi Arabia
[3] Menia Univ, Fac Sci, Phys Dept, El Minia 61519, Egypt
[4] Shaqra Univ, Fac Sci & Humanities Ad Dawadmi, Phys Dept, Shaqraa 11911, Saudi Arabia
[5] Benha Univ, Fac Engn Shoubra Cairo, Engn Math & Phys Dept, 108 Shoubra St, Cairo 11629, Egypt
来源：
PHYSICA B-CONDENSED MATTER | 2020年 / 576卷
关键词：
RF-Sputtering technique; Thin films; Optical parameters; Band-gap and urbach energies; WWD single oscillator model; Energy-dispersion parameters; CDSE QUANTUM DOTS; ELECTRICAL-PROPERTIES; PHOTOCATALYTIC ACTIVITY; CRYSTAL IMPERFECTIONS; HYDROTHERMAL METHOD; MICROSTRUCTURE; TEMPERATURE; ELECTRODES; BEHAVIOR; OXIDE;
D O I：
10.1016/j.physb.2019.411718
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Optical Characterizations of annealed TiO2 thin films have been discussed. Samples have prepared by sputtering technique at different reactive oxygen gas rates, R (1.00% <= R <= 30.00%). The pressure within the sputtering room was fixed at 7.5. 10(-7) Pa by controlling the rate of introducing pure Ar and O-2 gases. All film-samples were annealed in vacuum at 500 degrees C for 2 h. X-ray diffractograms revealed that annealed samples have polycrystalline nature of tetragonal anatase phase. Optical transmission and reflection were employed to study optical properties. Optical energy-gap values decrease from 3.38 eV to 2.91 eV for direct transition and from 3.12 eV to 2.10 eV for indirect transition, respectively. While, Urbach's energy values increase from 686 meV to 884 meV as R-value increased. Wemplee Di-Domenico model and Sellemeier postulate were utilized to study the refractive index dispersion and oscillator parameters. All estimated optical parameters are strongly dependent upon the flow rate of oxygen.
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页数：13
相关论文
共 92 条
[21]   TRENDS IN ENERGY GAPS OF BINARY COMPOUNDS - AN APPROACH BASED UPON ELECTRON-TRANSFER PARAMETERS FROM OPTICAL SPECTROSCOPY [J].
DUFFY, JA .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1980, 13 (16) :2979-2989
[22]   Absorption edge shift, optical conductivity, and energy loss function of nano thermal-evaporated N-type anatase TiO2 films [J].
El-Nahass, M. M. ;
Soliman, H. S. ;
El-Denglawey, A. .
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2016, 122 (08)
[23]   Structural, optical and dispersion characteristics of nanocrystalline GaN films prepared by MOVPE [J].
El-Nahass, M. M. ;
Farag, A. A. M. .
OPTICS AND LASER TECHNOLOGY, 2012, 44 (02) :497-503
[24]   Influence of Cd-content on structural and optical dispersion characteristics of nanocrystalline Zn1-xCdxS (0 ≤ x ≤ 0.9) films [J].
Farag, A. A. M. ;
Rafea, M. Abdel ;
Roushdy, N. ;
El-Shazly, O. ;
El-Wahidy, E. F. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2015, 621 :434-440
[25]   Optical and electrical properties of Ge10+xSe40Te50-x thin film [J].
Fayek, SA ;
El-Ocker, M ;
Hassanien, AS .
MATERIALS CHEMISTRY AND PHYSICS, 2001, 70 (02) :231-235
[26]  
Gupta M.C., 1997, Handbook of Photonics
[27]   Tailoring optical properties of TiO2-Cr co-sputtered films using swift heavy ions [J].
Gupta, Ratnesh ;
Sen, Sagar ;
Phase, D. M. ;
Avasthi, D. K. ;
Gupta, Ajay .
APPLIED SURFACE SCIENCE, 2018, 440 :403-408
[28]   Influence of substrate and annealing temperatures on optical properties of RF-sputtered TiO2 thin films [J].
Hasan, M. M. ;
Haseeb, A. S. M. A. ;
Saidur, R. ;
Masjuki, H. H. ;
Hamdi, M. .
OPTICAL MATERIALS, 2010, 32 (06) :690-695
[29]   Synthesis, crystallography, microstructure, crystal defects, and morphology of BixZn1-xO nanoparticles prepared by sol-gel technique [J].
Hassanien, A. S. ;
Akl, Alaa A. ;
Saaedi, A. H. .
CRYSTENGCOMM, 2018, 20 (12) :1716-1730
[30]   Study of optical properties of thermally evaporated ZnSe thin films annealed at different pulsed laser powers [J].
Hassanien, A. S. ;
Aly, K. A. ;
Akl, Alaa A. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2016, 685 :733-742
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