Optical properties and electronic structure of V2O5, V2O3 and VO2

Schneider, Krystyna

doi:10.1007/s10854-020-03596-0

Cited by 72 publications

(37 citation statements)

References 67 publications

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“…The comparison of the phase fractions in the inset table in Figure S3 shows a significant increase in the band gap from 1.7 to 2.3 eV, particularly for the V 2 O 5 phase. On the other hand, the defined 2.3 eV band gap energy is close to the data reported previously. , This implies that the visible-light transmittance of the multivalent vanadium oxide thin films originates by the V 2 O 5 phase. Besides, the surface morphology study shows that the porous film after heat treatment was applied (Figure S4).…”

Section: Resultssupporting

confidence: 90%

“…On the other hand, the defined 2.3 eV band gap energy is close to the data reported previously. 48,49 This implies that the visible-light transmittance of the multivalent vanadium oxide thin films originates by the V 2 O 5 phase. Besides, the surface morphology study shows that the porous film after heat treatment was applied (Figure S4).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Control of Polymorphic Properties of Multivalent Vanadium Oxide Thin Films

Allabergenov

Yun

Cho

et al. 2021

ACS Appl. Electron. Mater.

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In this study, V x O y thin films were deposited on borosilicate glass substrates using direct current (DC) magnetron sputtering. The optoelectronic thermochromic properties of the resulting multiphase vanadium oxide thin films were investigated. As-deposited (at 280 °C) films were annealed at 350, 450, and 500 °C in an oxygen atmosphere for 30 min in a tube furnace to improve the crystallinity. Structural analysis indicated the formation of a mixed-phase vanadium oxide film consisting of VO2(B), V4O9, and V2O5 phases on the amorphous substrate after annealing above 350 °C. The results showed that the semiconductor-to-metallic phase transition temperature of the vanadium oxide film increased from 48 to 63 °C with increasing annealing temperatures. The sample annealed at 450 °C exhibited the highest variation in the infrared (IR) transmittance (ΔT IR = 28.42%) and the resistivity switch decreased by two orders of magnitude (1.4 × 10–1–2.3 × 10–3 Ω/cm). The thermal treatment temperature affected the width of the thermal hysteresis loop (H LW) and slope stiffness. A narrower H LW of 1.9 °C and a sharp slope stiffness of 8.74 were obtained for the sample annealed at 500 °C. The slope stiffness plays an important role in the fabrication of ultrafast tunable energy-saving smart windows and IR switches.

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Section: Resultssupporting

confidence: 90%

Section: ■ Results and Discussionmentioning

confidence: 99%

Control of Polymorphic Properties of Multivalent Vanadium Oxide Thin Films

Allabergenov

Yun

Cho

et al. 2021

ACS Appl. Electron. Mater.

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“…This edge shifts to much lower wavelength of 350 nm after heat treatment. This occurs due to inter-band transition [21]. Figure 4a) the transmittance decreases after heat treatment, as expected.…”

Section: Optical Propertiessupporting

confidence: 80%

Effect of Heat Treatment on Band Gap of V2O5

Nathawat¹,

Kumawat²,

Rathore³

et al. 2021

J. Nano- Electron. Phys.

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The most stable oxide of the vanadium oxide family is V2O5. A lot of research effort is focused on it because it has a multitude of functional applications. Here we report on how the heat treatment (600°C, 5 h, air) affects the microstructure and hence, the band gap of V2O5. The V2O5 powders, initially obtained by simple thermal dissociation (500 °C, 3 h, air) of ammonium metavanadate, followed by heat treatment of pellets; were studied. The structural and optical studies performed using X-ray diffraction (XRD), FESEM and UV-Vis techniques, provide uniquely interesting results which indicate the possibility of band gap tuning by controlling the microstructure.

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“…Приведенные выше экспериментальные данные показывают, что полутораоксид ванадия (V 2 O 3 ) -кристаллический материал, испытывающий ФП изоляторметалл при температуре T c = 140 K. Известно [14], что при T > T c он представляет собой металл с ромбоэдрической (тригональной) симметрией решетки. При T < T c , V 2 O 3 переходит в изолирующую фазу моноклинной симметрии, то есть совершается структурный ФП с изменением симметрии кристаллической решетки.…”

Section: Discussionunclassified

Механизм Влияния Водорода На Фазовый Переход В Пленках v-=sub=-2-=/Sub=-O-=sub=-3-=/Sub=-

Ильинский¹,

Никулин²,

Шадрин³

2021

Физика Твердого Тела

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Показано, что в гидрированных пленках полутораоксида ванадия возникает избыток свободных электронов по сравнению с негидрированными пленками. Это приводит к сдвигу петель температурного гистерезиса термического фазового перехода изолятор-металл в область низких температур, то есть к уменьшению критической температуры Tc фазового перехода. Интерпретация результатов основана на том факте, что V2O3 представляет собой сильно коррелированный материал, а фазовый переход в нем носит комплексный характер: электронный переход Мотта инициирует структурный переход Пайерлса. Показано, что атомы внедренного водорода локализуются на ионах кислорода, образуя с ними дополнительные sigma-связи, термическое разрушение части которых приводит к увеличению концентрации свободных электронов в зоне проводимости гидрированных пленок V2O3. Ключевые слова: окислы ванадия, фазовый переход изолятор-металл, сильнокоррелированные материалы, гидрирование, водород.

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Optical properties and electronic structure of V2O5, V2O3 and VO2

Abstract: The electronic structure of the three main vanadium oxides—V2O3, VO2 and V2O5—is reviewed. The optical properties of vanadium pentoxide thin films were determined. It was found that a direct allowed transition is the most probable one in the studied vanadium pentoxide thin films.

Cited by 72 publications

References 67 publications

Control of Polymorphic Properties of Multivalent Vanadium Oxide Thin Films

Control of Polymorphic Properties of Multivalent Vanadium Oxide Thin Films

Effect of Heat Treatment on Band Gap of V2O5

Механизм Влияния Водорода На Фазовый Переход В Пленках v-=sub=-2-=/Sub=-O-=sub=-3-=/Sub=-

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