Correlation between <i>in situ</i> structural and optical characterization of the semiconductor-to-metal phase transition of VO<sub>2</sub> thin films on sapphire

Cesca, Tiziana; Scian, Carlo; Petronijevic, Emilija; Leahu, Grigore; Voti, R. Li; Cesarini, Gianmario; Macaluso, Roberto; Mosca, Mauro; Sibilia, C.; Mattei, Giovanni

doi:10.1039/c9nr09024j

Cited by 40 publications

(27 citation statements)

References 78 publications

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“…We performed numerical evaluation of the derivatives of the emissivity curves. Critical temperatures, corresponding to the points of minimum for the derivatives, were found to be T c (heating) = 73 °C and a T c (cooling) = 66 °C, in agreement with literature results 19 .…”

Section: Resultssupporting

confidence: 90%

“…More specifically, in Ref. 19 is shown that an enlargement of the hysteresis loop is observed due to the size dispersion of the crystallites and a progressive increase of the thermal hysteresis width is observed with the decrease of the thickness of the VO 2 , that can be related to the formation of VO 2 crystallites with smaller domains 19 .…”

Section: Discussionmentioning

confidence: 96%

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Adaptive tuning of infrared emission using VO2 thin films

Larciprete

Centini

Paoloni

et al. 2020

Sci Rep

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Phase-transition materials provide exciting opportunities for controlling optical properties of photonic devices dynamically. Here, we systematically investigate the infrared emission from a thin film of vanadium dioxide (VO 2). We experimentally demonstrate that such thin films are promising candidates to tune and control the thermal radiation of an underlying hot body with different emissivity features. In particular, we studied two different heat sources with completely different emissivity features, i.e. a black body-like and a mirror-like heated body. The infrared emission characteristics were investigated in the 3.5-5.1 μm spectral range using the infrared thermography technique which included heating the sample, and then cooling back. Experimental results were theoretically analyzed by modelling the VO 2 film as a metamaterial for a temperature range close to its critical temperature. Our systematic study reveals that VO 2 thin films with just one layer 80 nm thick has the potential to develop completely different dynamic tuning of infrared radiation, enabling both black-body emission suppression and as well as mirror emissivity boosting, in the same single layer device. Understanding the dynamics and effects of thermal tuning on infrared emission will benefit wide range of infrared technologies including thermal emitters, sensors, active IR filters and detectors. The possibility to tune the spectral features of a device, triggered by a thermal, electrical or optical stimulation, paves the way for many applications such as perfect infrared absorbers 1-4 , smart intelligent window coatings 5,6 , thermal rectification devices 7 or diodes/rectifiers 8. Thermochromic materials, such as niobium dioxide (NbO 2), vanadium sesquioxide (V 2 O 3), and vanadium dioxide (VO 2) undergo an abrupt phase transition from semiconductor to metallic state at a specific phase transition temperature 9-11. This phase change transition, from insulating monoclinic phase into a metallic tetragonal (rutile) phase, is accompanied by drastic changes in electrical, optical and magnetic properties as a function of the temperature. Among them, VO 2 is widely employed since it pertains the lowest phase transition temperature, T c = 341 K (68 °C) 12. The strong and reproducible changes in optical properties due to phase transition, have generated a burgeoning amount of theoretical and experimental studies focusing on the thermal emissivity variation activated by temperature in VO 2 13,14 in the IR 15 and THz radiation ranges 16. The thermal hysteresis intrinsic to the phase transition has been widely investigated and was found to be affected by several factors such as the film deposition temperature 17 , the use of different substrates 18-20 , the wavelength range 21 , the introduction of metallic dopants 22 and the dimensions of metallic grains 23. In particular, if metallic grain size is smaller than the wavelength of excitation, diffraction effects result in enhanced transmitted signal. When temperature increases, the grain sizes of exp...

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Section: Resultssupporting

confidence: 90%

Section: Discussionmentioning

confidence: 96%

Adaptive tuning of infrared emission using VO2 thin films

Larciprete

Centini

Paoloni

et al. 2020

Sci Rep

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“…Heterostructures, through the incorporation of distinct semiconductor and/or metal nanostructures, have emerged as the extensive investigations arisen from their innovative and superior optoelectronic [1,2], mechanic [3], and optical [4][5][6][7] properties, which further lead to the substantial improvement of various applications, ranging from photodetectors [8][9][10][11], solar cells [12][13][14], optical communications [15], to biological detection [16]. In the practical regard, nevertheless, the synthetic method of heterostructures turn out to be critical for attaining the requirement of manufacturing standards such as large production, simple procedure and sound reliability.…”

Section: Introductionmentioning

confidence: 99%

Optical Management of CQD/AgNP@SiNW Arrays with Highly Efficient Capability of Dye Degradation

et al. 2021

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The facile synthetic method for the preparation of incorporated carbon quantum dots (CQDs)/Ag nanoparticles (AgNPs) with well-aligned silicon nanowire (SiNW) arrays is demonstrated, offering the superior photodegradation capabilities covering UV to visible wavelength regions. By examining the morphology, microstructure, crystallinity, chemical feature, surface groups, light-emitting, and reflection characteristics, these hybrid heterostructures are systematically identified. Moreover, the involving degradation kinetics, band diagram, cycling capability, and underlying mechanism of photodegradation are investigated, validating their remarkable and reliable photocatalytic performances contributed from the strongly reduced light reflectivity, superior capability of charge separation, and sound wettability with dye solutions.

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“…In this paper, we aim to collect information and improve knowledge about the behavior of TMOs in solar cells by applying MoO3 and WO3 as selective hole contacts in c-Si HJT. First, we investigated the optical properties of MoO3 and WO3 layers deposited on quartz substrates by means of Pulsed Laser Deposition (PLD), a technique that allows obtaining a controllable and reproducible deposition of a broad number of metal oxides [10]- [18]. Then we used the same process to fabricate the TMO-based hole selective contact in solar cell prototypes based on n-type nanocrystalline silicon oxide [19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Transition Metal Oxides based Heterojunction Solar Cells with S-shaped J-V curves

Scirè

Bonadonna

Zhao

et al. 2020

2020 AEIT International Annual Conference (AEIT)

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The use of transition metal oxides for the selective carrier contact in the crystalline silicon solar cells technology is rising to interest for the excellent optoelectrical properties of these materials whose implementation, however, can result in lousy performing cells due to an S-shaped electrical characteristic. In this paper, we fabricated solar cells showing S-shaped J-V curve and carried out an analysis of the reasons of such behavior using a model involving the series of a standard cell equivalent circuit with a Schottky junction in order to explain these atypical performances. A good matching between the experimental measurements and the adopted theoretical model was obtained. The extracted parameters are listed and analyzed to shade light on the reasons behind the lowperformance cells.

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Correlation between in situ structural and optical characterization of the semiconductor-to-metal phase transition of VO₂ thin films on sapphire

Abstract: In situ XRD and IR optical measurements demonstrate the coexistence of M1 and R phases during the SMT transition of VO2 thin films.

Cited by 40 publications

References 78 publications

Adaptive tuning of infrared emission using VO2 thin films

Adaptive tuning of infrared emission using VO2 thin films

Optical Management of CQD/AgNP@SiNW Arrays with Highly Efficient Capability of Dye Degradation

Analysis of Transition Metal Oxides based Heterojunction Solar Cells with S-shaped J-V curves

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Correlation between in situ structural and optical characterization of the semiconductor-to-metal phase transition of VO2 thin films on sapphire

Abstract: In situ XRD and IR optical measurements demonstrate the coexistence of M1 and R phases during the SMT transition of VO2 thin films.

Cited by 40 publications

References 78 publications

Adaptive tuning of infrared emission using VO2 thin films

Adaptive tuning of infrared emission using VO2 thin films

Optical Management of CQD/AgNP@SiNW Arrays with Highly Efficient Capability of Dye Degradation

Analysis of Transition Metal Oxides based Heterojunction Solar Cells with S-shaped J-V curves

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Correlation between in situ structural and optical characterization of the semiconductor-to-metal phase transition of VO₂ thin films on sapphire