Atomistic Simulation of Ultra-Short Pulsed Laser Ablation of Al: An Extension for Non-Thermalized Electrons and Ballistic Transport

2021 ◽  
Author(s):  
Eugen Eisfeld ◽  
Daniel Förster ◽  
Dominic Klein ◽  
Johannes Roth
Keyword(s):  
Atomistic Simulation ◽  
Predictive Power ◽  
Computational Study ◽  
Ballistic Transport ◽  
Hybrid Approach ◽  
Pulsed Laser ◽  
Model Material ◽  
Ablation Depth ◽  
Temperature Model ◽  
Two Temperature

Abstract For our model material aluminum, the influence of the laser pulse duration in the range between 0.5 ps and 16 ps on the ablation depth is investigated in a computational study with a hybrid approach, combining molecular dynamics with the well known two-temperature model. A simple, yet expedient extension is proposed to account for the delayed thermalization as well as ballistic transport of the excited electrons. Comparing the simulated ablation depths to a series of our own experiments, the extension is found to considerably increase the predictive power of the model.

Control of Ablation Depth and Surface Structure in P3 Scribing of Thin-Film Solar Cells by a Picosecond Laser

2014 ◽  
Vol 2 (3) ◽  
Author(s):  
Xin Zhao ◽  
Yunfeng Cao ◽  
Qiong Nian ◽  
Gary Cheng ◽  
Yung C. Shin
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Picosecond Laser ◽  
Ablation Depth ◽  
Thin Film Solar Cells ◽  
Temperature Model ◽  
Periodic Surface ◽  
Cell Efficiency ◽  
Overlap Ratio ◽  
Two Temperature

In this paper, precise P3 scribing of thin-film solar cells (AZO/CIGS/Mo/Glass) via a picosecond laser is investigated. A parametric study is carried out for P3 scribing to study the effects of laser fluence and overlap ratio on ablation depth and slot quality, supported by the numerical prediction using a two-temperature model. The optimum scribing conditions are determined, and the potential processing speed is increased. Laser induced periodic surface structures are also presented after the scribing process, which can potentially enhance the absorption of the cell surface and consequently increase the cell efficiency.

Molecular-dynamics study of multi-pulsed ultrafast laser interaction with copper

2021 ◽  
Vol 16 (4) ◽  
pp. 457-472
Author(s):  
C.P. Yin ◽  
S.T. Zhang ◽  
Y.W. Dong ◽  
Q.W. Ye ◽  
Q. Li
Keyword(s):  
Molecular Dynamics ◽  
Laser Processing ◽  
Pulsed Laser ◽  
Copper Film ◽  
Temperature Curve ◽  
Ablation Depth ◽  
Ultrafast Laser ◽  
Laser Machining ◽  
Incubation Effect ◽  
Two Temperature

Ultrafast laser has an undeniable advantage in laser processing due to its extremely small pulse width and high peak energy. While the interaction of ultrafast laser and solid materials is an extremely non-equilibrium process in which the material undergoes phase transformation and even ablation in an extremely short time range. This is the coupling of the thermos elastic effect caused by the pressure wave and the superheated melting of the material lattice. To further explore the mechanism of the action of ultrafast laser and metal materials, the two-temperature model coupling with molecular dynamics method was used to simulate the interaction of the copper and laser energy. Firstly, the interaction of single-pulsed laser and copper film was reproduced, and the calculated two-temperature curve and the visualized atomic snapshots were used to investigate the influence of laser parameters on the ablation result. Then, by changing the size of the atomic system, the curve of ablation depth as a function of laser fluence was obtained. In this paper, the interaction of multi-pulsed laser and copper was calculated. Two-temperature curve and temperature contour of copper film after the irradiation of double-pulsed and multi-pulsed laser were obtained. And the factors which can make a difference to the incubation effect were analyzed. By calculating the ablation depth under the action of multi-pulsed laser, the influence of the incubation effect on ablation results was further explored. Finally, a more accurate numerical model of laser machining metal is established and verified by an ultra-short laser processing experiment, which provides a new calculation method and theoretical basis for ultra-fast laser machining of air film holes in aviation turbine blades, and has certain practical guiding significance for laser machining.

Two-temperature model for pulsed-laser-induced subsurface modifications in Si

2013 ◽  
Vol 114 (4) ◽  
pp. 1135-1143 ◽  
Author(s):  
P. C. Verburg ◽  
G. R. B. E. Römer ◽  
A. J. Huis in ’t Veld
Keyword(s):  
Pulsed Laser ◽  
Temperature Model ◽  
Two Temperature

Control of Ablation Depth and Surface Structure in P3 Scribing of Thin-Film Solar Cells by a Picosecond Laser

2014 ◽  
Author(s):  
Xin Zhao ◽  
Yunfeng Cao ◽  
Qiong Nian ◽  
Gary Cheng ◽  
Yung C. Shin
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Picosecond Laser ◽  
Ablation Depth ◽  
Thin Film Solar Cells ◽  
Temperature Model ◽  
Periodic Surface ◽  
Cell Efficiency ◽  
Overlap Ratio ◽  
Two Temperature

In this paper, precise P3 scribing of thin-film solar cells (AZO/CIGS/Mo/Glass) via a picosecond laser is investigated. A parametric study is carried out for P3 scribing to study the effects of laser fluence and overlap ratio on ablation depth and slot quality, supported by the numerical prediction using a two-temperature model. The optimum scribing conditions are determined, and the potential processing speed is increased. Laser induced periodic surface structures are also presented after the scribing process, which can potentially enhance the absorption of the cell surface and consequently increase the cell efficiency.

GENERAILIZED TWO-TEMPERATURE MODEL FOR COUPLED PHONONS IN NANOSIZED GRAPHENE

2018 ◽  
Author(s):  
Meng An ◽  
Qichen Song ◽  
Xiaoxiang Yu ◽  
Han Meng ◽  
Dengke Ma ◽  
...  
Keyword(s):  
Temperature Model ◽  
Two Temperature

scholarly journals A Ternary Map of Ni–Mn–Ga Heusler Alloys from Ab Initio Calculations

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 973
Author(s):  
Yulia Sokolovskaya ◽  
Olga Miroshkina ◽  
Danil Baigutlin ◽  
Vladimir Sokolovskiy ◽  
Mikhail Zagrebin ◽  
...  
Keyword(s):  
First Principles ◽  
Predictive Power ◽  
Computational Study ◽  
Heusler Alloys ◽  
Functional Materials ◽  
Ternary Diagram ◽  
Compositional Stability ◽  
Theoretical Predictions ◽  
Simultaneous Stability ◽  
Tetragonal Martensite

In the search for new magnetic functional materials, non-stoichiometric compounds remain a relatively unexplored territory. While experimentalists create new compositions looking for improved functional properties, their work is not guided by systematic theoretical predictions. Being designed for perfect periodic crystals, the majority of first-principles approaches struggle with the concept of a non-stoichiometric system. In this work, we attempt a systematic computational study of magnetic and structural properties of Ni–Mn–Ga, mapped onto ternary composition diagrams. Compositional stability was examined using the convex hull analysis. We show that the cubic austenite has its stability region close to the stoichiometric Ni2MnGa, in agreement with experimental data, while the tetragonal martensite spreads its stability over a wider range of Mn and Ni contents. The unstable compositions in both austenite and martensite states are located in the Ga-rich corner of the ternary diagram. We note that simultaneous stability of the austenite and martensite should be considered for potentially stable compounds suitable for synthesis. The majority of compounds are predicted to be ferrimagnetically ordered in both austenitic and martensitic states. The methodology used in this work is computationally tractable, yet it delivers some predictive power. For experimentalists who plan to synthesize stable Ni–Mn–Ga compounds with ferromagnetic order, we narrow the target compositional range substantially.

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