Study of structural, electrical and optical properties of vanadium oxide condensed films deposited by spray pyrolysis technique

doi:10.1007/s40436-013-0045-y

Advances in Manufacturing ›› 2013, Vol. 1 ›› Issue (4): 320-328.doi: 10.1007/s40436-013-0045-y

Study of structural, electrical and optical properties of vanadium oxide condensed films deposited by spray pyrolysis technique

M. Mousavi ¹• A. Kompany^1,2 • N. Shahtahmasebi^1,2 •M. M. Bagheri-Mohagheghi³

1. Department of Physics, Ferdowsi University of Mashhad,Mashhad, Iran
2. Nanoscience Center, Ferdowsi University of Mashhad, Mashhad,Iran
3. School of Physics, Damghan University, Damghan, Iran

收稿日期:2013-05-04 修回日期:2013-10-30 出版日期:2013-12-26 发布日期:2013-12-07
通讯作者: e-mail: m_mousavi1980@yahoo.com
作者简介:e-mail: m_mousavi1980@yahoo.com

Study of structural, electrical and optical properties of vanadium oxide condensed films deposited by spray pyrolysis technique

M. Mousavi ¹• A. Kompany^1,2 • N. Shahtahmasebi^1,2 •M. M. Bagheri-Mohagheghi³

1. Department of Physics, Ferdowsi University of Mashhad,Mashhad, Iran
2. Nanoscience Center, Ferdowsi University of Mashhad, Mashhad,Iran
3. School of Physics, Damghan University, Damghan, Iran

Received:2013-05-04 Revised:2013-10-30 Online:2013-12-26 Published:2013-12-07
Contact: e-mail: m_mousavi1980@yahoo.com
About author:e-mail: m_mousavi1980@yahoo.com

摘要/Abstract

摘要： Vanadium oxides condensed films are prepared on glass substrates, using spray pyrolysis (SP) technique.The effects of substrate temperature, vanadium concentration in initial solution and the solution spray rate on the nano-structural, electrical, and optical properties of deposited films were investigated. Characterizations of the samples were performed using X-ray diffraction (XRD),scanning electron microscopy (SEM), and UV-Vis spectroscopy methods. The type and concentration of the charge carriers were determined and measured by Hall effect experiment. XRD patterns showed that the prepared films had polycrystalline structure, mostly tetragonal β-V₂O₅and V₄O₉ phases with the preferred orientation along (200) direction. The Hall effect experiment revealed that all samples were n-type, except the ones deposited at substrate temperatures Tsub = 300 ℃ and Tsub = 450 ℃, vanadium concentration 0.1 mol/L and solution spray rate 10 mL/min.The charge carrier concentrations obtained were in the range 10¹⁶–10¹⁸ cm^-3. The lowest sheet resistance (R_s) was obtained for the samples prepared at T_sub = 450 ℃, vanadium concentration 0.05 mol/L and solution spray rate 10 mL/min. It was also found that the optical transparency of the samples changed from 20% to 75% and the optical band gap of the samples was from 2.22 eV to 2.58 eV, depending on the deposition conditions.

关键词: Vanadium oxide , Thin films , Optical properties , Spray pyrolysis

Abstract: Vanadium oxides condensed films are prepared on glass substrates, using spray pyrolysis (SP) technique.The effects of substrate temperature, vanadium concentration in initial solution and the solution spray rate on the nano-structural, electrical, and optical properties of deposited films were investigated. Characterizations of the samples were performed using X-ray diffraction (XRD),scanning electron microscopy (SEM), and UV-Vis spectroscopy methods. The type and concentration of the charge carriers were determined and measured by Hall effect experiment. XRD patterns showed that the prepared films had polycrystalline structure, mostly tetragonal β-V₂O₅and V₄O₉ phases with the preferred orientation along (200) direction. The Hall effect experiment revealed that all samples were n-type, except the ones deposited at substrate temperatures Tsub = 300 ℃ and Tsub = 450 ℃, vanadium concentration 0.1 mol/L and solution spray rate 10 mL/min.The charge carrier concentrations obtained were in the range 10¹⁶–10¹⁸ cm^-3. The lowest sheet resistance (R_s) was obtained for the samples prepared at T_sub = 450 ℃, vanadium concentration 0.05 mol/L and solution spray rate 10 mL/min. It was also found that the optical transparency of the samples changed from 20% to 75% and the optical band gap of the samples was from 2.22 eV to 2.58 eV, depending on the deposition conditions.

Key words: Vanadium oxide , Thin films , Optical properties , Spray pyrolysis

M. Mousavi A. Kompany N. Shahtahmasebi M. M. Bagheri-Mohagheghi. Study of structural, electrical and optical properties of vanadium oxide condensed films deposited by spray pyrolysis technique[J]. Advances in Manufacturing, 2013, 1(4): 320-328.

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Study of structural, electrical and optical properties of vanadium oxide condensed films deposited by spray pyrolysis technique

Study of structural, electrical and optical properties of vanadium oxide condensed films deposited by spray pyrolysis technique

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