研究目的
Investigating the kinetics of laser-induced, liquid-mediated crystallization of amorphous Ge thin films using multi-frame dynamic transmission electron microscopy.
研究成果
Multi-frame DTEM experiments show that Zone II growth rates do not fluctuate as widely as claimed in recent reports, providing a more accurate measure of the Zone II crystallization kinetics. The growth rate may be influenced by the local temperature gradient upon initiation, but more work is needed to understand the connection between the spatio-temporal temperature profiles and the kinetics of crystal growth in these experiments.
研究不足
The study acknowledges that there may be growth rate changes that were not able to be resolved, and more work is required to clarify how the temperature, temperature gradient, and heat loss conditions impact the growth rate.
1：Experimental Design and Method Selection:
The study utilized multi-frame dynamic transmission electron microscopy (DTEM) to observe the crystallization process in amorphous Ge thin films induced by a 12-ns laser pulse with a Gaussian spatial profile.
2：Sample Selection and Data Sources:
50-nm amorphous Ge films deposited at room temperature by magnetron sputtering onto TEM specimen supports with a 20-nm thick amorphous silicon nitride window were used.
3：List of Experimental Equipment and Materials:
A frequency doubled Nd:YAG laser (532-nm wavelength), TEM specimen supports with amorphous silicon nitride windows, and a DTEM equipped with a laser system capable of generating multiple photo-emitted electron pulses.
4：Experimental Procedures and Operational Workflow:
Crystallization was induced with laser pulses, and bright-field TEM images of each crystallization event were generated from nine 20-ns electron pulses with an interframe spacing of 95 ns.
5：Data Analysis Methods:
The extent of Zone II crystal growth at each time step was determined by fitting an ellipse to the crystalline Ge and taking half of the minor axis of the ellipse as the position of the front relative to the center of the laser spot.
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