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arXiv · 1601.04103

Thermal Sublimation: a Scalable and Controllable Thinning Method for the Fabrication of Few-Layer Black Phosphorus

Weijun Luo·Rui Yang·Jialun Liu·Yunlong Zhao·Wenjuan Zhu·Guangrui·Xia
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Abstract

In this work, we reported uniform layer-by-layer sublimation of black phosphorus under heating below 600 K. The uniformity and crystallinity of BP samples after thermal thinning were confirmed by Raman spectra and 2D Raman imaging. A uniform and crystalline bilayer black phosphorus flake with an area of 180 um^2 was prepared with this method. No micron scale defects were observed. The sublimation rate of BP was around 0.18 nm / min at 500 K and 1.5 nm / min at 550 K. Both room and high temperature Raman peak intensity ratio Si/A2g vs. BP thickness relations were established for in-situ thickness determination. The sublimation thinning method was shown to be a controllable and scalable approach to prepare few-layer black phosphorus.

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Weijun Luo, Rui Yang, Jialun Liu, Yunlong Zhao, Wenjuan Zhu, Guangrui, Xia. 2016-01-16. Thermal Sublimation: a Scalable and Controllable Thinning Method for the Fabrication of Few-Layer Black Phosphorus. https://doi.org/10.1088/1361-6528/aa76ae

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