Photoacoustic Characterization of TiO2 Thin-Films Deposited on Silicon Substrate Using Neural Networks

Djordjević, Katarina; Markushev, D. K.; Popović, Marica N.; Nesic, M. V.; Galović, S.; Markushev, D. D.

doi:10.3390/ma16072865

Cited by 3 publications

(1 citation statement)

References 68 publications

(117 reference statements)

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“…In this paper, in order to further reduce the resistivity of the Al 2 O 3 ceramic, on the basis of the previous research on Cr 2 O 3 and MnO 2 -doped Al 2 O 3 ceramics, we chose TiO 2 , with semiconductor properties, as an additive, and studied the effect of the TiO 2 addition on the performance of the Al 2 O 3 ceramics. TiO 2 has low resistivity, but few studies have been reported on the effects of TiO 2 on the resistivity and voltage holdoff capacity of Al 2 O 3 ceramics, since the valence of Ti changes in different compounds and its mechanism of action in materials is complicated [ 23 , 24 ]. On the basis of Cr/Mn-doped Al 2 O 3 ceramics, we fixed Cr 2 O 3 :MnO 2 = 1:1 (mass ratio) in this paper and studied the effects of the additional amount of TiO 2 on the microstructure, phase composition, secondary electron emission characteristics, resistivity, and surface flash properties of the Al 2 O 3 ceramic in a vacuum.…”

Section: Introductionmentioning

confidence: 99%

Study of TiO2 on the Voltage Holdoff Capacity of Cr/Mn-Doped Al2O3 Ceramic in Vacuum

et al. 2023

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With the development of vacuum electronic devices toward high power, high frequency, and miniaturization, the voltage holdoff capacity of the insulation materials in devices has also been raised to a higher demand. Cr/Mn/Ti-doped Al2O3 ceramics were prepared, and the bulk density, micromorphology, phase composition, resistivity, secondary electron emission coefficient, and surface flashover threshold in the vacuum of the Al2O3 were characterized. The results show that the addition of TiO2 to the Al2O3 ceramic can promote the sintering of the ceramic. The Cr/Mn/Ti-doped Al2O3 ceramic with a homogeneous microstructure can be obtained by an appropriate amount of TiO2 addition. In the process of the heat treatment, the TiO2 in the ceramics was reduced to a certain degree, which had an impact on the microstructure of the Al2O3 ceramic. Adding a small amount of TiO2 can improve the voltage holdoff performance in the vacuum. The value of the surface flashover threshold in the vacuum of the Cr/Mn/Ti-doped Al2O3 ceramic containing 1 wt.% TiO2 reached a value of 33 kV, which is 32% higher than that of the basic Al2O3 ceramic. The preparation of Al2O3 ceramics with a high voltage holdoff capacity in a vacuum provides fundamental technical support for the development of vacuum electronic devices.

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Section: Introductionmentioning

confidence: 99%

Study of TiO2 on the Voltage Holdoff Capacity of Cr/Mn-Doped Al2O3 Ceramic in Vacuum

et al. 2023

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Thermal lensing and photoacoustics as potential tools for nanomaterial characterization: a review

Swapna,

Sankararaman,

Korte

2024

J Mater Sci

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This comprehensive review highlights the versatile applications of photothermal techniques, particularly thermal lens spectrometry (TLS) and photoacoustic spectrometry (PAS), in the field of nanomaterials characterization. TLS is an effective technique in the trace detection of different compounds in liquid samples, photodegradation studies, and analysis of photocatalytic reaction rate, as well as the study of molecular dynamics, impacting both environmental and catalytical research. It enables the optimization of thermal diffusivity in soot nanofluids and offers insights into seed germination and plant yield enhancement in nanobiophotonics. The review also explores the thermal and elastic characterization of Fe2O3 polymorphs by photoacoustic spectroscopy (PAS). Investigating the metal mirror demonstrates PAS’s efficacy in determining its reflection coefficient and thermal diffusivity. ZnO nanoparticles’ strong absorption on diatomite surfaces is revealed through PAS, emphasizing their effectiveness in light absorption enhancement. Furthermore, PA techniques address working frequency limitations in studying silicon-based nanomaterials. Thus, thermal lens and photoacoustic spectroscopy assume pivotal roles in unveiling the nuanced attributes of various nanostructured materials, thereby propelling advancements in the realms of science and technology.

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Effect of amplitude measurements on the precision of thermal parameters’ determination in GaAs using frequency-resolved thermoreflectance

Chatterjee,

Dziczek,

Song

et al. 2024

Journal of Applied Physics

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Non-contact photothermal pump-probe methodologies such as Frequency-Domain Thermo-Reflectance (FDTR) systems facilitate the examination of thermal characteristics spanning semiconductor materials and their associated interfaces. We underscore the significance of meticulous measurements and precise error estimation attained through the analysis of both amplitude and phase data in Thermo-Reflectance (TR). The precision of the analytical estimation hinges greatly on the assumptions made before implementing the method and notably showcases a decrease in errors when both the amplitude and phase are incorporated as input parameters. We demonstrate that frequency-domain calculations can attain high precision in measurements, with error estimations in thermal conductivity (k), thermal boundary resistance (Rth), and thermal diffusivity (α) as low as approximately 2.4%, 2.5%, and 3.0%, respectively. At the outset, we evaluate the uncertainty arising from the existence of local minima when analyzing data acquired via FDTR, wherein both the phase and amplitude are concurrently utilized for the assessment of cross-plane thermal transport properties. Expanding upon data analysis techniques, particularly through advanced deep learning approaches, can significantly enhance the accuracy and precision of predictions when analyzing TR data across a spectrum of modulation frequencies. Deep learning models enhance the quality of fitting and improve the accuracy and precision of uncertainty estimation compared to traditional Monte Carlo simulations. This is achieved by providing suitable initial guesses for data fitting, thereby enhancing the overall performance of the analysis process.

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Photoacoustic Characterization of TiO2 Thin-Films Deposited on Silicon Substrate Using Neural Networks

Cited by 3 publications

References 68 publications

Study of TiO2 on the Voltage Holdoff Capacity of Cr/Mn-Doped Al2O3 Ceramic in Vacuum

Study of TiO2 on the Voltage Holdoff Capacity of Cr/Mn-Doped Al2O3 Ceramic in Vacuum

Thermal lensing and photoacoustics as potential tools for nanomaterial characterization: a review

Effect of amplitude measurements on the precision of thermal parameters’ determination in GaAs using frequency-resolved thermoreflectance

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