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Synthesis of 2D Layered BiI 3 Nanoplates, BiI 3 /WSe 2 van der Waals Heterostructures and Their Electronic, Optoelectronic Properties
Author(s) -
Li Jia,
Guan Xun,
Wang Chen,
Cheng HungChieh,
Ai Ruoqi,
Yao Kangkang,
Chen Peng,
Zhang Zhengwei,
Duan Xidong,
Duan Xiangfeng
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201701034
Subject(s) - heterojunction , van der waals force , materials science , photoluminescence , semiconductor , optoelectronics , raman spectroscopy , nanotechnology , rectification , band gap , condensed matter physics , optics , chemistry , physics , power (physics) , organic chemistry , quantum mechanics , molecule
Two–dimensional layered materials (2DLMs) have attracted considerable recent interest as a new material platform for fundamental materials science and potential new technologies. Here we report the growth of layered metal halide materials and their optoelectronic properties. BiI 3 nanoplates can be readily grown on SiO 2 /Si substrates with a hexagonal geometry, with a thickness in the range of 10–120 nm and a lateral dimension of 3–10 µm. Transmission electron microscopy and electron diffraction studies demonstrate that the individual nanoplates are high quality single crystals. Micro‐Raman studies show characteristic A g band at ≈115 cm −1 with slight red‐shift with decreasing thickness, and micro‐photoluminescence studies show uniform emission around 690 nm with blue‐shift with decreasing thickness. Electrical transport studies of individual nanoplates show n‐type semiconductor characteristics with clear photoresponse. Further, the BiI 3 can be readily grown on other 2DLMs (e.g., WSe 2 ) to form van der Waals heterostructures. Electrical transport measurements of BiI 3 /WSe 2 vertical heterojunctions demonstrate p–n diode characteristics with gate‐tunable rectification behavior and distinct photovoltaic effect. The synthesis of the BiI 3 nanoplates can expand the library of 2DLMs and enable a wider range of van der Waals heterostructures.