Energy band structure investigation of blue and green light emitting Mg doped SnO2 nanostructures synthesized by combustion method

Shajira, P.S.; Bushiri, M. Junaid; NAIR, BINI B; Prabhu, V. Ganeshchandra

doi:10.1016/j.jlumin.2013.07.073

Cited by 51 publications

(23 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, a proportional decrease of the average crystallite size (D) with the increase of the Mg-doping levels can also be observed in Table 1. Overall, these properties suggest the presence of local lattice disorders in the films and, in turn, an increment of surface defects in the Mg-doped samples with respect to the non-doped samples, as noticed earlier in the literature [29]. host atom (Sn 4+ : 0.71 Å ), and also by the lower electronic density of Mg atoms (1.738 g/cm 3 ) compared to Sn atoms (β−Sn = 7.265 g/cm 3 ).…”

Section: Films Analysis and Characterizationsupporting

confidence: 80%

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

Bendahmane

Tomić

Touidjen

et al. 2020

Sensors

View full text Add to dashboard Cite

This work presents the effect of magnesium (Mg) doping on the sensing properties of tin dioxide (SnO2) thin films. Mg-doped SnO2 films were prepared via a spray pyrolysis method using three doping concentrations (0.8 at.%, 1.2 at.%, and 1.6 at.%) and the sensing responses were obtained at a comparatively low operating temperature (160 °C) compared to other gas sensitive materials in the literature. The morphological, structural and chemical composition analysis of the doped films show local lattice disorders and a proportional decrease in the average crystallite size as the Mg-doping level increases. These results also indicate an excess of Mg (in the samples prepared with 1.6 at.% of magnesium) which causes the formation of a secondary magnesium oxide phase. The films are tested towards three volatile organic compounds (VOCs), including ethanol, acetone, and toluene. The gas sensing tests show an enhancement of the sensing properties to these vapors as the Mg-doping level rises. This improvement is particularly observed for ethanol and, thus, the gas sensing analysis is focused on this analyte. Results to 80 ppm of ethanol, for instance, show that the response of the 1.6 at.% Mg-doped SnO2 film is four times higher and 90 s faster than that of the 0.8 at.% Mg-doped SnO2 film. This enhancement is attributed to the Mg-incorporation into the SnO2 cell and to the formation of MgO within the film. These two factors maximize the electrical resistance change in the gas adsorption stage, and thus, raise ethanol sensitivity.

show abstract

Section: Films Analysis and Characterizationsupporting

confidence: 80%

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

Bendahmane

Tomić

Touidjen

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…We should emphasize a good correspondence between experimental results and theoretical fits by Formula (8). The values of the parameters B i calculated from the fitting curves were used for the estimation of electron dephasing length L ϕ by means of the following formula:…”

Section: Resultsmentioning

confidence: 99%

“…and attracts tremendous attention among scientists and manufacturers of optoelectronic devices due to the unique coexistence of high conductivity and optical transparency in the visible range of electromagnetic spectrum [1][2][3]. Combination of the excellent electrical and optical properties of tin dioxide are exploited for such applications as transparent electrodes in solar cells, flat-panel displays, touch-sensitive control panels, coatings for energy-conserving windows in ovens and antifogging windows in airplanes, light-emitting diodes, UV sensors, highly active photocatalysts [3][4][5][6][7][8][9][10]. The high sensitivity of tin dioxide electrical conductivity due to the interaction processes of its surface with the gas molecules is utilized for the fabrication of gas, chemical and humidity sensors [11,12].…”

Section: Introductionmentioning

confidence: 99%

Weak Localization in Polycrystalline Tin Dioxide Films

et al. 2020

View full text Add to dashboard Cite

The electrical and magnetotransport properties of nanocrystalline tin dioxide films were studied in the temperature range of 4–300 K and in magnetic fields up to 8 T. SnO2−δ films were fabricated by reactive direct current (DC) magnetron sputtering of a tin target with following 2 stage temperature annealing of synthesized samples. The nanocrystalline rutile structure of films was confirmed by X-ray diffraction analysis. The temperature dependences of the resistance R(T) and the negative magnetoresistance (MR) were explained within the frame of a model, taking into account quantum corrections to the classical Drude conductivity. Extracted from the R(T) and R(B) dependences electron dephasing length values indicate the 3D character of the weak localization (WL) in our samples.

show abstract

“…Table .1. The negative value of strain implies a compressive strain in lattice [28,29], which decreases (in magnitude) with increasing Mn co- Therefore, the co-dopant Mn would also modify the electronic structure of SnO 2 by giving a bandgap narrowing and thus introducing a redshift in the absorption edge [33]. In addition to that, the band gap decrease is due to increase in the carrier concentration by the inclusion of Cr and Mn ions and creation of defect levels in the bandgap [34].…”

Section: Morphological Studiesmentioning

confidence: 99%