Crystallization behavior of amorphous GST films under an ultrafast laser irradiation

IF 4.6 2区 物理与天体物理 Q1 OPTICS
Xuechen Zhang , Jing Lv , Jinlong Xu , Liang Xie , Guodong Zhang , Zhongyin Zhang , Shujuan Li , Guanghua Cheng
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Abstract

The crystallization behaviors of amorphous Ge2Sb2Te5 films induced by an ultrafast laser with a time-shaping Gaussian intensity distribution have been studied. The crystalline regions were characterized using optical microscopy, scanning electron microscopy, atomic force microscopy, and Raman spectroscopy. It is found that the region ablated by a single pulse undergoes recrystallization, with a reflectivity higher than that of the non-ablated crystalline region. While preserving the integrity of the film, the diameter of the region with high and uniform reflectivity induced by burst mode is twice that of a single pulse, and the reflectivity is 3 % higher than the 31 % achieved with a single pulse. Additionally, the energy window for laser-induced crystallization expands with an increasing number of burst pulses; specifically, it increases by approximately 2.4 times when the number of sub-pulses is 4 or 5. The Raman results at low pulse energy show a high peak intensity at the 105 cm−1 in related to the vibrations of Te-rich tetrahedra, indicating that the degree of crystallinity in the burst mode region is superior to that achieved with single pulse irradiation. Furthermore, the blue shift of this Raman peak with increased pulse energy further supports that burst mode provides sufficient time for nucleation growth. This work offers insights into achieving more controllable crystallization, which can enhance its applications in phase change memory and other reconfigurable devices.
超快激光照射下非晶态 GST 薄膜的结晶行为
研究了具有时间整形高斯强度分布的超快激光诱导的非晶态 Ge2Sb2Te5 薄膜的结晶行为。使用光学显微镜、扫描电子显微镜、原子力显微镜和拉曼光谱对结晶区域进行了表征。研究发现,被单脉冲烧蚀的区域会发生再结晶,其反射率高于未被烧蚀的结晶区域。在保持薄膜完整性的同时,猝发模式诱导的高均匀反射率区域的直径是单脉冲的两倍,反射率比单脉冲的 31% 高出 3%。此外,激光诱导结晶的能量窗口随着猝发脉冲数的增加而扩大;具体而言,当子脉冲数为 4 或 5 时,能量窗口大约增加 2.4 倍。低脉冲能量下的拉曼结果显示,在 105 cm-1 处出现了与富碲四面体振动有关的高强度峰值,这表明猝发模式区域的结晶程度优于单脉冲辐照。此外,该拉曼峰随着脉冲能量的增加而发生蓝移,进一步证明猝发模式为成核生长提供了充足的时间。这项工作为实现更可控的结晶提供了启示,可提高其在相变存储器和其他可重构设备中的应用。
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来源期刊
CiteScore
8.50
自引率
10.00%
发文量
1060
审稿时长
3.4 months
期刊介绍: Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems
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