Temperature-dependent morphology of chemical vapor grown molybdenum disulfide

• Main Authors: Wang, Yantao, Zhou, Jiadong, Liu, Zheng, Yang, Xiaoyin
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2017
• Subjects: Morphology; Molybdenum disulfide
• Online Access: https://hdl.handle.net/10356/86340; http://hdl.handle.net/10220/44011
• Institution: Nanyang Technological University

Monolayered molybdenum disulfide (MoS2) is a 2D direct band gap semiconductor with promising potential applications. In this work, we observed the temperature dependency of the morphologies of MoS2 monolayers from chemical vapor deposition. At a low growing temperature below 850 °C, MoS2 flakes tend to be trianglular in shape. At 850–950 °C, hexagonal MoS2 flakes can be observed. While at a temperature over 950 °C, MoS2 flakes can form rectangular shapes. Complementary characterizations have been made to these samples. We also proposed a mechanism for such temperature-dependent shape evolution based on thermodynamic simulation.