Two-Dimensional Palladium Diselenide with Strong In-Plane Optical Anisotropy and High Mobility Grown by Chemical Vapor Deposition
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- Two-Dimensional Palladium Diselenide with Strong In-Plane Optical Anisotropy and High Mobility Grown by Chemical Vapor Deposition
- Gu, Yiyi; Cai, Hui; Dong, Jichen; Yu, Yiling; Hoffman, Anna N.; Liu, Chenze; Oyedele, Akinola D.; Lin, Yu-Chuan; Ge, Zhuozhi; Puretzky, Alexander A.; Duscher, Gerd; Chisholm, Matthew F.; Rack, Philip D.; Rouleau, Christopher M.; Gai, Zheng; Meng, Xiangmin; Ding, Feng; Geohegan, David B.; Xiao, Kai
- Issue Date
- WILEY-V C H VERLAG GMBH
- ADVANCED MATERIALS, v.32, no.19, pp.1906238
- Two-dimensional (2D) palladium diselenide (PdSe2) has strong interlayer coupling and a puckered pentagonal structure, leading to remarkable layer-dependent electronic structures and highly anisotropic in-plane optical and electronic properties. However, the lack of high-quality, 2D PdSe2 crystals grown by bottom-up approaches limits the study of their exotic properties and practical applications. In this work, chemical vapor deposition growth of highly crystalline few-layer (>= 2 layers) PdSe2 crystals on various substrates is reported. The high quality of the PdSe2 crystals is confirmed by low-frequency Raman spectroscopy, scanning transmission electron microscopy, and electrical characterization. In addition, strong in-plane optical anisotropy is demonstrated via polarized Raman spectroscopy and second-harmonic generation maps of the PdSe2 flakes. A theoretical model based on kinetic Wulff construction theory and density functional theory calculations is developed and described the observed evolution of "square-like" shaped PdSe2 crystals into rhombus due to the higher nucleation barriers for stable attachment on the (1,1) and (1,-1) edges, which results in their slower growth rates. Few-layer PdSe2 field-effect transistors reveal tunable ambipolar charge carrier conduction with an electron mobility up to approximate to 294 cm(2) V-1 s(-1), which is comparable to that of exfoliated PdSe2, indicating the promise of this anisotropic 2D material for electronics.
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