Realizing the Intrinsic Anisotropic Growth of 1T′ ReS₂ on Selected Au(101) Substrate toward Large‐Scale Single Crystal Fabrication

Abstract

Low‐symmetry 2D materials with strong in‐plane anisotropy are ideal platforms for building multifunctional optoelectronic devices. However, the random orientations and easy formation of multidomain structures lead to the single‐crystal synthesis of these materials remains a big challenge. Herein, for the first time, the orientation‐controlled synthesis of ReS2, a typical low‐symmetry 2D material, is explored via interface engineering based on the strong interaction between the material and Au substrates with different symmetries. It is revealed that the lattice orientation and growth behavior of ReS2 are closely relevant to the lattice symmetry of Au facets. Single crystal ReS2 domains with two and even one orientations are acquired on the four‐fold symmetry Au(001) facet and the two‐fold symmetry Au(101) facet, respectively. Combined with density functional theory calculations, it is demonstrated that the synergy of ultra‐strong ReS2‐Au interfacial coupling and reduction of symmetry of Au facet is critical to realizing its intrinsic anisotropic growth. Furthermore, great enhancement of electrical and photoelectrical performances are acquired on the well‐aligned single crystal ReS2 device. The progress achieved in this work provides significant guidance for the controllable synthesis of wafer‐scale single crystals of low‐symmetry 2D materials for their practical device applications.

Review of Anisotropic 2D Materials: Controlled Growth, Optical Anisotropy Modulation, and Photonic Applications

“…The anisotropic growth of ReS 2 can also be modulated via coupling with the substrate. [ 105 ] Through engaging Au (001) and Au (101) substrate, the Re 4 ‐chain reconstruction is suppressed, promoting the preferable growth along b (010) plane and the formation of well‐aligned single‐crystalline ReS 2 .…”

Directional Migration and Rapid Coalescence of Au Nanoparticles on Anisotropic ReS2

“…This new Raman peak may be assigned to the vibrational mode of a Au−S bond, which reflects the strong coupling of the electronic orbitals between ReS 2 and Au: i.e., the accumulation of charges at the interface. 32 Moreover, the new Raman peak can be detected regardless of the layer numbers of ReS 2 (Figure S1). To confirm the electron interaction or transfer at the interface, XPS was carried out on pristine ReS 2 and the Au-ReS 2 heterostructure.…”

Epitaxial growth of inch-scale single-crystal transition metal dichalcogenides through the patching of unidirectionally orientated ribbons

“…Recently, several strategies have been developed for the direct synthesis of monolayer TMDs ribbons 10 , such as Na-Mo-O droplets driven growth on NaCl single crystals 11 , substrate-directed synthesis on phosphine pre-treated Si(001) substrates 12 , as well as ledge-directed epitaxy on β-Ga 2 O 3 (100) 13 . These strategies have individually achieved the control of their thickness, orientation and dimensionality, nevertheless, the synthesis of TMDs ribbons possessing all the above advantages has not been realized.…”