Year: 2015
Type: article
Abstract: In this work, we study the interlayer phonon vibration modes, the layer-numberdependent optical bandgap, and the anisotropic photoluminescence (PL) spectra of atomically thin rhenium diselenide (ReSe 2 ) for the first time. The ultralow frequency interlayer Raman spectra and the polarization-resolved high frequency Raman spectra in ReSe 2 allow the identification of its layer number and crystal orientation. Furthermore, PL measurements show the anisotropic optical emission intensity of the material with its bandgap increasing from 1.26 eV in the bulk to 1.32 eV in the monolayer. The study of the layer-number dependence of the Raman modes and the PL spectra reveals relatively weak van der Waal’s interaction and two-dimensional (2D) quantum confinement in the atomically thin ReSe 2 . The experimental observation of the intriguing anisotropic interlayer interaction and tunable optical transition in monolayer and multilayer ReSe 2 establishes the foundation for further exploration of this material in the development of anisotropic optoelectronic devices functioning in the near-infrared spectrum, which is important for many applications in optical communication and infrared sensing.
Source: Nano Research
Authors: Huan Zhao, Jiangbin Wu, Hongxia Zhong, Qiushi Guo, Xiaomu Wang, Fengnian Xia, Li Yang, Pingheng Tan, Han Wang
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1812824610