Epitaxial growth of monolayer PdTe₂ and patterned PtTe₂ by direct tellurization of Pd and Pt surfaces

Abstract

palladium ditelluride (PdTe2) and platinum ditelluride (PtTe2) are two Dirac semimetals which demonstrate fascinating quantum properties such as superconductivity, magnetism and topological order, illustrating promising applications in future nanoelectronics and optoelectronics. However, the synthesis of their monolayers is dramatically hindered by strong interlayer coupling and orbital hybridization. In this study, an efficient synthesis method for monolayer PdTe2 and PtTe2 is demonstrated. Taking advantages of the surface reaction, epitaxial growth of large-area and high quality monolayers of PdTe2 and patterned PtTe2 is achieved by direct tellurization of Pd(111) and Pt(111). A well-ordered (2×2) PtTe2 pattern with Kagome lattice formed by Te vacancy arrays is successfully grown. Moreover, multilayer PtTe2 can be also obtained and potential excitation of Dirac plasmons is observed. The simple and reliable growth procedure of monolayer PdTe2 and patterned PtTe2 gives unprecedented opportunities for investigating new quantum phenomena and facilitating practical applications in optoelectronics.

Large spin Hall conductivity and excellent hydrogen evolution reaction activity in unconventional PtTe1.75 monolayer

“…It hosts the layered structure stacking along the z axis. The patterned monolayer with kagome lattice formed by one Te vacancy in the 2×2 supercell has been successfully grown on the Pt(111) surface 18 . As shown in Fig.…”

“…The pristine PtTe 2 system crystallizes in the CdI 2 -type trigonal (1T) structure (SG P 3m1) is a layered material stacking along the z axis. Recently, the monolayer structure with kagome lattice formed by one Te vacancy in the 2×2 supercell has been successfully grown 18 . The patterned PtTe 2 monolayer contains two Te layers, with 4 Te atoms in the bottom layer while 3 Te atoms in the top layer, as shown in Fig.…”

“…More recently, PtTe 2 -based broadband photodetectors and image sensors have been fabricated, demonstrating tremendous potential application value in various photoelectric devices [15][16][17] . Very recently, the patterned monolayer with kagome lattice formed by one Te vacancy in the 2 × 2 supercell has been grown successfully 18 , whose band topology and potential properties are unknown. The study of PtTe 2 derivatives can not only reveal novel condensed matter physics but also facilitate the versatile development in device physics.…”

Toward Perfect Surfaces of Transition Metal Dichalcogenides with Ion Bombardment and Annealing Treatment

“…39 The defects in group-10 TMD materials have also been recently reported, focusing on the identification of point defects. [20][21][22][23]48 However, a viable method for and a mechanistic understanding of decreasing defects in group-10 TMD materials have scarcely been achieved. We characterized the surface structures and morphologies of PtTe 2 and PdTe 2 with scanning tunneling microscopy (STM), reflection highenergy electron diffraction (RHEED), and synchrotron-based photoelectron spectroscopy (PES).…”

Investigation of the Electron–Phonon Coupling in Dirac Semimetal PdTe2 via Temperature‐Dependent Raman Spectroscopy

“…Each Pd atom is surrounded by six (neighboring) Te aatoms, with lattice constants a = b = 4.0365 and c = 5.1262 Å. [ 12 ] Recently, many methods have been developed to synthesize PdTe 2 like molecular beam epitaxy (MBE), [ 13,14 ] direct epitaxial growth on the Pd (111) surface via tellurization, [ 15 ] slow cooling method, [ 8 ] and the ultrasonic liquid exfoliation. [ 16 ] Generally, exfoliated flakes ranging from monolayer to several layers have inherent electrical characteristics, purity, and high crystallinity that are useful for particular devices and basic investigations.…”