Impedance Spectroscopy of Polycrystalline Tin Dioxide Films

Adamchuk, Dzmitry; Ксеневич, В. К.; Горбачук, Н. И.; Шиманский, В. И.

doi:10.21122/2220-9506-2016-7-3-312-321

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…Thus, as a result of the analysis of the XRD spectra of the SnO/SnO 2−δ /SnO 2 samples, we can conclude: i) tin oxide films of a variable stoichiometric composition with a predominant tin monoxide phase were fabricated by means of DC magnetron sputtering in the argon plasma followed by a 2-stage annealing process; ii) reactive magnetron sputtering with a small content of oxygen (about 1 vol.%) in the argon-oxygen plasma leads to the preferable formation of more thermodynamically stable tin dioxide nanocrystalline films with a tetragonal rutile-type crystalline structure; iii) increasing of oxygen content during the process of reactive magnetron sputtering up to the value of about 2 vol.% induces the formation of amorhous tin oxide films after following a heat treatment procedure regardless of the annealing temperature. It should be noted that the crystalline structure of tin oxide films with a different stoichiometric composition can be improved by means of additional high-temperature annealing in vacuum or inert atmosphere [22].…”

Section: Resultsmentioning

confidence: 99%

Nonstoichiometric tin oxide films: study by X-ray diffraction, Raman scattering and electron paramagnetic resonance

Adamchuk¹,

Ксеневич²,

Poklonski³

et al. 2020

physics

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Nonstoichiometric SnO/SnO2/SnO2−δ films were fabricated by DC magnetron sputtering and reactive DC magnetron sputtering of tin target with further 2-stage temperature annealing of synthesized materials. X-ray diffraction analysis, Raman spectroscopy and electron paramagnetic resonance (EPR) spectroscopy were employed to study the influence of oxygen content in the plasma during the sputtering process and the temperature of annealing on the stoichiometric and phase composition of synthesized films. It was found that the tin monoxide phase prevailed in the films fabricated by DC magnetron sputtering in the argon plasma followed by a 2-stage annealing process. Nanocrystalline films containing both tin monoxide and tin dioxide were synthesized when reactive magnetron sputtering with a small content of oxygen (of about 1 vol.%) was used. The increase of oxygen content in the plasma to the value of about 2 vol.% leads to the formation of amorphous films. The intensity of the Raman peaks inherent in SnO2 vibration modes was found to depend on the content of the tin monoxide phase in the films. This effect can be attributed to the dissipative transition of electronic excitation from tin monoxide to tin dioxide nanocrystallites.

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Section: Resultsmentioning

confidence: 99%

Nonstoichiometric tin oxide films: study by X-ray diffraction, Raman scattering and electron paramagnetic resonance

Adamchuk¹,

Ксеневич²,

Poklonski³

et al. 2020

physics

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“…Востребованность метода импедансной спектроскопии в последние десятилетия возросла в связи с возросшим уровнем технического и программного обеспечения метода, что позволило сократить временные затраты на получение и обработку экспериментальных данных. За счет проведения измерений на переменном токе импедансная спектроскопия позволяет исследовать механизмы переноса заряда как на фазовой границе раздела двух сред, так и в объеме пленки, выявить происходящие на поверхности полупроводника физико-химические процессы, а за счет варьирования в широком диапазоне частот переменного сигнала наблюдать процессы, протекающие с разными скоростями [13][14][15][16][17][18][19][20].…”

Section: Introductionunclassified

Исследование импедансных характеристик наноструктурного ZnO<La> сенсора паров перекиси водорода

Шахназарян¹,

Шахатуни²,

Алексанян³

et al. 2022

Physics

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Изготовлен наноструктурный сенсор для обнаружения паров перекиси водорода. Газочувствительная пленка сенсора на основе легированного 2 ат.% La металлоксида ZnO получена методом высокочастотного магнетронного распыле- ния. В области температур от комнатной до 200С исследованы импедансные и вольт-амперные характеристики ZnO<La> сенсора как до, так и после воздействия паров перекиси водорода. На основе анализа частотных характеристик ком- плексного импеданса предложена эквивалентная электрическая цепь для исследуемой сенсорной структуры, оценены параметры составляющих ее элементов и рассчитаны аппроксимирующие кривые. Показано, что основной вклад в чувствительность изготовленного сенсора дают процессы, протекающие на поверхности полупроводниковой пленки. Исследовано влияние изменения концентрации целевого газа на чувствительность ZnO<La> сенсора.

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“…Также на рентгеновских спектрах присутствуют пики, характерные для рассеяния на плоскостях (200), (211) и (112) SnO 2 тетрагональной структуры типа рутила [20]. Средний размер кристаллитов SnO 2 оценивался из соотношения Дебая -Шеррера [21]:…”

unclassified

Features of water vapor adsorption and desorption on the surface of non-stoichiometric tin dioxide films

Adamchuk

Ксеневич

Поклонский

et al. 2020

Vescì Akademìì navuk Belarusì. Seryâ fizika-matematyčnyh navuk

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Herein, the influence of water vapor adsorption and desorption processes on the surface of SnO2−δ nanocrystalline films with different concentrations of oxygen vacancies on their electrical conductivity at room temperature was studied. SnO2−δ films were synthesized by means of reactive magnetron sputtering of tin in an argon-oxygen plasma followed by 2-stage oxidative annealing. The concentration of oxygen vacancies in the films was varied by changing the 2nd stage annealing temperature within the range 350–400 °C. It was found that in the films with the highest concentration of oxygen vacancies (~1020 cm−3) in the region of low relative humidity (less than ~30 %), an increase in electrical conductivity was observed due to the dissociative adsorption of water molecules with the formation of hydroxyl groups. The adsorption of water vapor on the surface of SnO2−δ films at room temperature at relative humidity values higher than ~30 % was found to induce a decrease in the electrical conductivity of the samples. The generation of positive and negative EMF pulses between the open surface of SnO2−δ nanocrystalline films and the one covered by waterproof materials under the adsorption and desorption of water vapor, respectively, was detected. The change of resistance and the generated EMF value under the adsorption-desorption processes was found to increase with the concentration of free charge carriers in the films.

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Impedance Spectroscopy of Polycrystalline Tin Dioxide Films

Cited by 7 publications

References 1 publication

Nonstoichiometric tin oxide films: study by X-ray diffraction, Raman scattering and electron paramagnetic resonance

Nonstoichiometric tin oxide films: study by X-ray diffraction, Raman scattering and electron paramagnetic resonance

Исследование импедансных характеристик наноструктурного ZnO<La> сенсора паров перекиси водорода

Features of water vapor adsorption and desorption on the surface of non-stoichiometric tin dioxide films

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