SnO2 films: formation, electrical and optical properties

Gorley, P. M.; Khomyak, V. V.; Bilichuk, S. V.; Orletsky, I. G.; Horley, Paul; Grechko, V.O.

doi:10.1016/j.mseb.2004.12.026

Cited by 45 publications

(27 citation statements)

References 21 publications

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“…These values are similar to those reported elsewhere [10,12]. It was observed from the carrier concentration (Nd) data that the FTO thin films exhibit n-type conductivity which is also achieved by other deposition techniques including spray pyrolysis and PLD [2,9].…”

Section: Electrical Propertiessupporting

confidence: 89%

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Electrical and Optical Properties of Fluorine Doped Tin Oxide Thin Films Prepared by Magnetron Sputtering

et al. 2014

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Fluorine doped tin oxide (FTO) coatings have been prepared using the mid-frequency pulsed DC closed field unbalanced magnetron sputtering technique in an Ar/O2 atmosphere using blends of tin oxide and tin fluoride powder formed into targets. FTO coatings were deposited with a thickness of 400 nm on glass substrates. No post-deposition annealing treatments were carried out. The effects of the chemical composition on the structural (phase, grain size), optical (transmission, optical band-gap) and electrical (resistivity, charge carrier, mobility) properties of the thin films were investigated. Depositing FTO by magnetron sputtering is an environmentally friendly technique and the use of loosely packed blended powder targets gives an efficient means of screening candidate compositions, which also provides a low cost operation. The best film characteristics were achieved using a mass ratio of 12% SnF2 to 88% SnO2 in the target. The thin film produced was polycrystalline with a tetragonal crystal structure. The optimized conditions resulted in a thin film with average visible transmittance of 83% and optical band-gap of 3.80 eV, resistivity of 6.71 × 10

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Section: Electrical Propertiessupporting

confidence: 89%

“…Some techniques require a high substrate temperature to deposit the film, which can often cause the formation of intermediate semiconductor oxide layers at the film boundary [12]. Any post-treatment of the films, such as annealing, also poses additional operational costs and reduced throughput.…”

Section: Introductionmentioning

confidence: 99%

Electrical and Optical Properties of Fluorine Doped Tin Oxide Thin Films Prepared by Magnetron Sputtering

et al. 2014

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“…In general transition metals serve as "accelerators" of various processes [19] and noble metals serve as "catalysts" and also decreases the sensor operation temperature [20]. Platinum (Pt) and Palladium (Pd) are the most used dopants due to their chemical inertness and high work function (~5.8 and ~5.4 eV, respectively) than the band gap (3.6 eV) of SnO2 [21][22][23][24][25]. In other hand, Copper (Cu) is the most used transition metal for doping due its comparable ionic radius as tin.…”

Section: Introductionmentioning

confidence: 99%

An Elaborated Study of CO Sensitivities of Cu, Pt and Pd Activated SnO<sub>2</sub> Sensors: Effect of Precipitation Agents, Dopants and Doping Methods

Karthik¹,

Gómez-Pozos²,

Rodríguez-Lugo³

et al. 2017

Preprint

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Abstract:In this work, we report synthesis of Cu, Pt and Pd doped SnO2 powders and their comparative CO gas sensing studies. Dopants were incorporated into SnO2 nanostructures using chemical and impregnation methods by using urea and ammonia as precipitation agents. The synthesized samples were characterized using X-ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM) and High resolution transmission electron microscopy (HR-TEM). The presence of dopants within the SnO2 nanostructures was evidenced from HR-TEM. Doped powders utilizing chemical methods with urea as precipitation agent presented higher sensitivities compared to the remaining, which is due to the formation of uniform and homogeneous particles resulted from the temperature assisted synthesis. The particle sizes of doped SnO2 nanostructures were in the range of 40-100 nm. An enhanced sensitivity around 1783 was achieved with Cu doped SnO2 when compared with two other dopants i.e., Pt (1200) and Pd: SnO2(502). The high sensitivity of Cu: SnO2 is due to formation of CuO and its excellent association and dissociation in the presence of CO with adsorbed atmospheric oxygen at sensor operation temperatures resulted in high conductance. Cu: SnO2 may be an alternative and cost effective sensor for industrial applications.

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“…It confers a naturally n-type conduction to this wide bandgap (about 3.6 eV 5,6 ) semiconductor. Several techniques have been used for the deposition of tin dioxide thin films: sputtering 7 , pyrolysis 8 , sol-gel-dip-coating (SGDC) 9 . Each of these techniques provides films with distinct properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of pH of colloidal suspension on the electrical conductivity of SnO2 thin films deposited via Sol-Gel-Dip-Coating

Ravaro

Scalvi

2011

Mat. Res.

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Tin dioxide (SnO 2 ) thin films are deposited by the dip-coating technique from colloidal suspensions prepared with distinct pH through the sol-gel method. The decrease of the pH contributes to the destruction of an electrical layer adjacent to particles in solution, leading to a high degree of aggregation among these particles due to the generation of cross-linked bonds (Sn-O-Sn) between them. The aggregation affects the electrical properties of films, because the pH variation produces particle with distinct sizes in the film. Undoped samples prepared from pH 6 leads to the highest conductivity among the investigated undoped samples, in agreement with X-ray diffractograms, which indicate higher crystallinity for lower pH. Arrhenius plot evaluated from temperature dependent conductivity data leads to activation energies of the deepest level between 67 to 140 meV, for the films prepared from suspensions with pH 6 to 11. The most probable explanation for this variation in the conductivity and activation energy is related to distinct potential barriers between grains, due to distinct packing caused by cross-linked bonds formed during suspension phase. Characterization of samples lightly doped with Er 3+ confirms that acid pH leads to higher conductivity, but the highest conduction takes place at even lower pH when compared to undoped thin films.

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SnO2 films: formation, electrical and optical properties

Cited by 45 publications

References 21 publications

Electrical and Optical Properties of Fluorine Doped Tin Oxide Thin Films Prepared by Magnetron Sputtering

Electrical and Optical Properties of Fluorine Doped Tin Oxide Thin Films Prepared by Magnetron Sputtering

An Elaborated Study of CO Sensitivities of Cu, Pt and Pd Activated SnO<sub>2</sub> Sensors: Effect of Precipitation Agents, Dopants and Doping Methods

Influence of pH of colloidal suspension on the electrical conductivity of SnO2 thin films deposited via Sol-Gel-Dip-Coating

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