Preparation and optical properties of thin films of CrO3 and Cr2O3 prepared by the method of chemical spray pyrolysis

Misho, R. H.; Murad, W.A.; Fattahallah, G.H.

doi:10.1016/0040-6090(89)90706-2

Cited by 45 publications

(17 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We also have to note that plain Cr 2 O 3 is long been known to be an exceptionally hard and durable material, which promises good stability of films in devices. 23,24 There are also reports of the possibility of n-type doped Cr 2 O 3 25 , which may open up prospects of fully transparent homojunctions, if the anionic co-doping approch with nitro- gen can equally be employed to enhance transparency. In addition it has already been shown that amorphous Cr 2 O 3 :N can improve organic solar cell performance.…”

mentioning

confidence: 99%

Magnesium, nitrogen codoped Cr2O3: A p-type transparent conducting oxide

Arca

Fleischer

Shvets

2011

Applied Physics Letters

View full text Add to dashboard Cite

A p-type Transparent Conductive Oxide (TCO) was synthesised by codoping of poorly-conducting chromium oxide (Cr 2 O 3 ) with magnesium and nitrogen. We demonstrated that the codoping produced a TCO with good figure of merit despite using spray pyrolysis for deposition. The nitrogen enhances the specular transparency of the films in the visible range (400-700 nm) and, Mg improves the conductivity while retaining the p-type character of the material. Co-doping with both elements produces a p-type oxide with a low resistivity of 3 Ωcm and transmission up to 65% for a 150 nm thick film. A comparison with other known p-type materials is given.p-type transparent conducting oxides (TCOs) have attracted much attention since the deposition of thin films of CuAlO 2 delafossite structure was reported in 1997.

show abstract

mentioning

confidence: 99%

Magnesium, nitrogen codoped Cr2O3: A p-type transparent conducting oxide

Arca

Fleischer

Shvets

2011

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…[1] showed an absorption band at 300 nm (4.1 eV) for hydrothermally synthesized Cr 2 O 3 films having a direct band gap according to Tauc formula (αhν) = A(hν − E g ) 1/2 at 3.2 eV. For sprayed Cr 2 O 3 films Misho et al [12] reported a direct energy gap of 3.40 eV and for solvothermal nanocrystalline Cr 2 O 3 [13] a direct bandgap at 3.6 -4.0 eV. Using UV-VIS spectroscopy, Ivanova et al [14] obtained Cr 2 O 3 indirect band gap according to a formula α (ν) = A(hν − E g )…”

Section: Cr O 3 Optical Propertiesmentioning

confidence: 97%

Dispersion of chromia films (eskolaite) in UV-VIS

Kasikov

Tarre

Marandi

2019

Journal of Electrical Engineering

View full text Add to dashboard Cite

Atomic layer deposited polycrystalline Cr2O3 films grown from chromyl chloride and methanol were analysed using spectrophotometry, spectral ellipsometry and atomic force microscopy. The films possessed polycrystalline eskolaite structure with rough sublayer in contact with air. Using the positions and peak widths of the two visible absorption bands as fixed from absorption measurements, we could determine the optical dispersion of the film material in 1.3 – 6 eV energy region. A direct band gap of chromia film grown in these conditions was 3.2 eV, the other also direct absorption band with a gap of 5.15 eV was found situated in UV.

show abstract

“…Chromium oxide shows different optical and resistivity behaviour due to stoichiometric changes arising from the preparation techniques and parameters used during the deposition process. The thin films can be prepared using various deposition techniques such as electronbeam evaporation, chemical vapour deposition, sputtering, pulse laser deposition, chemical spray pyrolysis and arc ion plating [5,[15][16][17][18][19][20]. Goodlet et al [21] in their investigation of electronic properties of chromium oxide reported band gaps in the range 2.7eV to 2.9eV for reactively sputtered chromium oxide films.…”

Section: Introductionmentioning

confidence: 99%

Influence of RF power on the stoichiometry, optical, and electrical properties of chromium oxide coatings prepared by reactive magnetron sputtering

Oje¹,

Ogwu²,

Oje³

et al. 2019

Mater. Res. Express

View full text Add to dashboard Cite

An investigation has been carried out on the stoichiometry, optical and electrical properties of chromium oxide thin films prepared under various deposition powers using RF magnetron sputtering technique. The elemental and chemical composition of the prepared films were characterised by energy dispersive X-ray (EDX) analysis, Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR). The wettability and surface energies of the thin films were investigated with a goniometer. The four-point electrical probe method was used to determine the electrical resistivity of the films while the optical properties of the films were measured with a spectrophotometer. The coatings were found to be mainly 2 3 phase based on the dominance of A1g and Eg symmetric modes in the Raman investigations and the Eu vibration mode in the FTIR measurements. The RF powers used during the deposition process were found to have played a vital role in the formation of Cr 2 O 3 rich films. It was observed that higher deposition power facilitated both the dislodging of more chromium atoms from the target and dissociation of oxygen used during the deposition process. The wettability results show that the thin films are hydrophilic and interact well with water and this behaviour is linked to the contribution of the polar component to the total surface energy. Optical transmittance values exceeding 70% were obtained for the films prepared at a lower RF power. The resistivity values varied from 0.061 Ω cm to 0.152 Ω cm for the deposited chromium oxide films. The variation in the electrical resistivity and the optical transmittance of the films with RF power indicate that these film properties can be altered or tuned to suit specific applications e.g. as transparent conducting oxide (TCO) for optoelectronic devices and other similar applications.

show abstract

Preparation and optical properties of thin films of CrO3 and Cr2O3 prepared by the method of chemical spray pyrolysis

Cited by 45 publications

References 6 publications

Magnesium, nitrogen codoped Cr2O3: A p-type transparent conducting oxide

Magnesium, nitrogen codoped Cr2O3: A p-type transparent conducting oxide

Dispersion of chromia films (eskolaite) in UV-VIS

Influence of RF power on the stoichiometry, optical, and electrical properties of chromium oxide coatings prepared by reactive magnetron sputtering

Contact Info

Product

Resources

About