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Controlled CVD Growth of High-Quality Bi2Se3 Hexagonal Microflakes: Revealing Thermal Stability and Laser Damage
Xinyu Yao1, Haoyun Dou1, Yongchang Li1
1Yunnan Key Laboratory of Optoelectronic Information Technology, College of Physics and Electronic Information, Yunnan Normal University, Kunming650500, China.
Abstract:
The scalable synthesis of high-quality Bi2Se3 topological insulator crystals with controlled morphology remains challenging for fundamental research and optical applications. Herein, we report a chemical vapor deposition (CVD) strategy for growth of single-crystalline Bi2Se3 microflakes. By fine-tuning the growth kinetics at 480 °C, uniform microflakes with smooth surfaces and precise stoichiometry were obtained. Comprehensive characterizations confirm the high-crystallinity and c-axis-preferred orientation of the as-grown samples. Temperature-dependent Raman spectroscopy reveals high lattice stability. Power-dependent Raman measurements further reveal a distinct laser-damage threshold (∼50% of maximum power), beyond which local structural disorder arises from photothermal effects. This work not only provides a synthetic route to high-quality Bi2Se3 crystals but also establishes optical stability criteria essential for their integration into advanced photonic systems.
