Optical and electrical properties of V2O5 thin films

Soud, A.M. Abo El; Mansour, B. A.; Soliman, L. I.

doi:10.1016/0040-6090(94)90487-1

Cited by 29 publications

(11 citation statements)

References 13 publications

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“…The conductivity of V 2 O 5 films attained values of 10 -5 to 10 -2 [1] and 0.9 Scm -1 [6]. The conduction mechanism of these amorphous V 2 O 5 films was reported to be small polaronic hopping in the non-adiabatic regime [1].…”

Section: Introductionmentioning

confidence: 97%

Electrical and Optical Properties of MoO3-TeO2 Amorphous Films Prepared by PVD Method

Pal¹,

Tsujigami²,

Yoshikado³

et al. 2000

phys. stat. sol. (a)

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Electrical and optical properties of MoO 3 -TeO 2 amorphous films prepared by vacuum deposition method were investigated. X-ray diffraction patterns show an amorphous structure. The dc conductivity of the films was measured in the temperature range 323-523 K and follows a non-adiabatic small polaron hopping conduction mechanism between Mo 4þ and Mo 5þ , confirmed by X-ray photoelectron spectroscopy measurements. Conductivity of the films increases with increase of MoO 3 content. The Seebeck coefficient indicates the films to be n-type semiconductor. Optical absorption edge analysis gave a band gap energy of 2.7-2.9 eV depending on composition. The Urbach tail analysis gave the width of localized states between 0.23 and 0.25 eV.

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Section: Introductionmentioning

confidence: 97%

Electrical and Optical Properties of MoO3-TeO2 Amorphous Films Prepared by PVD Method

Pal¹,

Tsujigami²,

Yoshikado³

et al. 2000

phys. stat. sol. (a)

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“…plasma-enhanced chemical vapor deposition [15] and by vapor deposition in high vacuum [16] on heated substrates. Finally, other workers found that spin-coated V 2 O 5 films were amorphous after annealing at a temperature of 300 C for 1 hour.…”

Section: Structure and Morphology Of The Filmsmentioning

confidence: 99%

Structural, Optical and Electrochromic Properties of Sol–Gel V₂O₅Thin Films

Benmoussa

Outzourhit

Jourdani

et al. 2003

Active and Passive Electronic Components

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Vanadium pentoxide thin films are prepared by the sol-gel route by dissolving V 2 O 5 powder (99.5% purity) in H 2 O 2 solution. The solution is spin-coated on glass substrates for optical (UV-VIS-NIR) and XRD analysis, and on ITOcoated glass substrates for electrochromic measurements. The samples are then annealed at 150 C for 1 hour. The resulting films have a yellow-orange color, typical of polycrystalline V 2 O 5 . XRD measurements have shown that after annealing in air at 400 C the structure of the films has a c-axis preferred orientation, the (0 0 1)-type planes lying parallel to the substrate. SEM analysis revealed a smooth surface. The films' optical and physical constants (n, a, Eg, the thickness d and the mean thickness inhomogeneity s) are calculated using a simple and accurate method based on the transmission spectrum alone. The films' electrochromism is studied using cyclic voltammetry (CV) and chronoamperometry in propylene carbonate solution containing 1 mol=l LiClO 4 . The films show reversible multichromism (yellow-green-blue) upon Li þ ion insertion=extraction. The absorbance of films colored at three different potentials is measured in the UV-VIS-PIR wavelength range, and this study shows that the changes in the optical absorption are consistent with the film color changes. Finally, the optical and electrochromic properties of the films prepared by this method are compared with those of our sputtered films already studied and with other works.

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“…Another possible reason for the low electrical conductivity is the presence of V 2 O 5 phase, since it has very low electrical conductivity ($50 S m À1 at 120 C). 81 According to the XRD pattern of 7 + 7 + 7 h sample (aer polishing its surface), there exist a trace amount of other oxides like VO 2Àx (VO 0.5 , etc. ), which might also be responsible for the lowered electrical conductivity.…”

Section: Resultsmentioning

confidence: 99%