Dynamics of Laser-Induced Phase Transitions in Cadmium Telluride

Kovalev, A. A.; Zhvavyi, S. P.; Зыков, Г. Л.

doi:10.1134/1.2128454

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…The effective value of the heat capacity c eff was used instead of c . This transformation of the heat capacity allowed the heat energy absorption during the phase change to be taken into account [ 17 , 18 , 19 ]. The equation implies continuous increasing of the temperature for temperatures far from the melting point.…”

Section: Resultsmentioning

confidence: 99%

“…where κ is the thermal conductivity (160 W/m•K for W, 55 W/m•K for Nb), c is the heat capacity (140 J/kg•K for W, 280 J/kg•K for Nb) and ρ is the density of the target (19,350 kg/m 3 for W, 8570 kg/m 3 for Nb). The effective value of the heat capacity c eff was used instead of c. This transformation of the heat capacity allowed the heat energy absorption during the phase change to be taken into account [17][18][19]. The equation implies continuous increasing of the temperature for temperatures far from the melting point.…”

Section: Temperature Transfer Analysismentioning

confidence: 99%

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Structure and Phase Composition of WNb Alloy Formed by the Impact of Compression Plasma Flows

et al. 2023

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The results of a tungsten–niobium alloy synthesis by the impact of pulsed compression plasma flows are presented. Tungsten plates with a 2 μm thin niobium coating were treated with dense compression plasma flows generated by a quasi-stationary plasma accelerator. The plasma flow with an absorbed energy density of 35–70 J/cm2 and pulse duration of 100 μs melted the niobium coating and a part of the tungsten substrate, which caused liquid-phase mixing and WNb alloy synthesis. Simulation of the temperature distribution in the top layer of the tungsten after the plasma treatment proved the formation of the melted state. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to determine the structure and phase composition. The thickness of the WNb alloy was 10–20 μm and a W(Nb) bcc solid solution was found.

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Section: Resultsmentioning

confidence: 99%

Section: Temperature Transfer Analysismentioning

confidence: 99%

Structure and Phase Composition of WNb Alloy Formed by the Impact of Compression Plasma Flows

et al. 2023

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“…In our simulations, the value of thermal conductivity was taken from Refs. [57,58] for solid and liquid state, respectively. The specific heat for both solid and liquid state was taken from Ref.…”

Section: Cadmium Telluridementioning

confidence: 99%

On the Melting Thresholds of Semiconductors under Nanosecond Pulse Laser Irradiation

2023

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In this work, a unified numerical model is used to determine the melting thresholds and to investigate the early stages of melting of several crystalline semiconductors (Si, Ge, GaAs, CdTe and InP) irradiated by nanosecond laser pulses. A molten fraction approach is used for continuous transition over the melting point. The results are compared with previously published theoretical and experimental data. A survey on the thermophysical and optical properties of the selected materials has been carried out to gather the most relevant data on temperature dependent properties for the solid and liquid states of these semiconductors where such data are available. A generalization of the obtained results is established that enables evaluation of the melting thresholds for different semiconductors based on their properties and irradiation conditions (laser wavelength, pulse duration).

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“…The mathematical modeling of phase transitions initiated in cadmium telluride by a pulsed laser radiation on the basis of the heat conductivity equation [4,11,16,17] is complicated due to the account for those parts of the optical radiation energy that are spent on the instant thermalization ( ≈ 10 −12 s) and the excitation of the electron-hole plasma followed by its diffusion and recombination. In work [18], this was done by making allowance for the energy components that are released at the thermalization of excited charge carriers immediately after their excitation and at the nonradiative bulk and surface recombinations.…”

Section: Calculation Formulas For the Melting Thresholdmentioning

confidence: 99%

“…an agreement takes place. In work [17], the theoretical value for th at p = 100 ns equals 0.6 MW/cm 2 (60 kJ/cm 2 ); the calculations take into account the cadmium evaporation, owing to which CdTe begins to melt at a certain depth from its surface. Furthermore, according to our calculations, the CdTe melting threshold equals 9.08 kW/cm 2 at the ruby laser pulse duration p = 1.2 ms.…”

Section: Belowmentioning

confidence: 99%

Dependence of the CdTe Melting Threshold on the Pulse Duration and Wavelength of Laser Radiation and the Parameters of Non-Equilibrium Charge Carriers

Veleschuk¹,

Vlasenko²,

Vlasenko³

et al. 2017

Ukr. J. Phys.

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The dependences of the melting threshold of CdTe under the pulsed laser irradiation on the radiation wavelength and the laser pulse duration p are calculated with regard for the nonequilibrium character of charge carriers. Three components of the energy released at the thermalization of excited carriers under the nanosecond laser irradiation of CdTe in the fundamental absorption region are considered: the component that dominates immediately after the excitation, and the components released at the nonradiative bulk and nonradiative surface recombinations. Together, they determine the depth of heat penetration into the crystal and, therefore, its melting threshold. It is shown that the CdTe melting threshold grows from 2.6 to 4.75 MW/cm 2 , when changes from 300 to 800 nm at p = 20 ns. The changes in the nonequilibrium charge carrier parameters (the surface recombination rate, lifetime, and diffusion depth) are found to vary the CdTe melting threshold by at least 30%. K e y w o r d s: cadmium telluride, pulsed laser irradiation.

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Dynamics of Laser-Induced Phase Transitions in Cadmium Telluride

Cited by 7 publications

References 8 publications

Structure and Phase Composition of WNb Alloy Formed by the Impact of Compression Plasma Flows

Structure and Phase Composition of WNb Alloy Formed by the Impact of Compression Plasma Flows

On the Melting Thresholds of Semiconductors under Nanosecond Pulse Laser Irradiation

Dependence of the CdTe Melting Threshold on the Pulse Duration and Wavelength of Laser Radiation and the Parameters of Non-Equilibrium Charge Carriers

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