Formation Mechanism of the Nanostructures and Crystallographic Features on Silicon Created by Ultrafast Laser Scanning
Xiong Zhang , Siyi Ji , Benny C.F. Cheung , Yixuan Sun , Chunming Wang , Zibin Chen , Xiaohong Zhan , Chunjin Wang
Engineering ›› : 202512036
The manufacture of nanostructures on silicon (Si) has profound implications across diverse disciplines. Previous research has focused mainly on qualitative explanations based solely on evidence from electromagnetic and matter reorganization theories. This study designed experiments and explored the characteristics of nanostructures created by scanning with an ultrafast laser, in which experimental evidence supporting both electromagnetic and matter reorganization theories was simultaneously observed. Four distinct surface morphologies were identified, each with specific formation thresholds: 0.06, 0.09, 0.22, and 0.27 J ⋅ cm−2. The polycrystalline Si that emerged at the apex of the monocrystalline Si matrix was directly characterized, and the occurrence of SiO2 and α-Si was detailed. The simultaneous and distinct contributions of electromagnetic and reorganization theories were revealed. By examining the relationship between phase transitions and laser features, the conditions under which each mechanism operates were established. This study provides novel insights into the precise control of Si nanostructures, which could revolutionize applications in electronics, photonics, and materials science.
Silicon / Ultrafast laser / Micro/nanostructures / Crystallographic features / Mechanism
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