Novel two-dimensional monoelemental and ternary materials: growth, physics and application

Abstract

<jats:title>Abstract</jats:title> <jats:p>Two-dimensional (2D) materials have undergone a rapid development toward real applications since the discovery of graphene. At first, graphene is a star material because of the ultrahigh mobility and novel physics, but it always suffered from zero bandgap and limited device application. Then, 2D binary compounds such as transition-metal chalcogenides emerged as complementary materials for graphene due to their sizable bandgap and moderate electrical properties. Recently, research interests have turned to monoelemental and ternary 2D materials. Among them, monoelemental 2D materials such as arsenic (As), antimony (Sb), bismuth (Bi), tellurium (Te), etc., have been the focus. For example, bismuthene can act as a 2D topological insulator with nontrivial topological edge states and high bulk gap, providing the novel platforms to realize the quantum spin-Hall systems. Meanwhile, ternary 2D materials such as Bi<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>Se, BiOX and CrOX (X=Cl, Br, I) have also emerged as promising candidates in optoelectronics and spintronics due to their extraordinary mobility, favorable band structures and intrinsic ferromagnetism with high Curie temperature. In this review, we will discuss the recent works and future prospects on the emerging monoelemental and ternary materials in terms of their structure, growth, physics and device applications.</jats:p>

Bonding, structure, and mechanical stability of 2D materials: the predictive power of the periodic table

“…276 Besides different stoichiometries, chemistry allows the grouping of more than two elements to realize a plethora of chemical bonding types and structural arrangements, e.g., in ternary or quaternary 2D materials. 277 Besides compounds of main group elements 278 transition metal-dichalcogenides (TMDs), with partially empty d orbitals, such as the semiconductors MoS 2 and WS 2 , have already attracted enormous attention. 279 Furthermore, layered transition metal oxides (LTMO), layered halide perovskites, and layered double hydroxides (LDHs) belong to emerging 2D materials.…”

A high performance self-powered photodetector based on a 1D Te–2D WS2 mixed-dimensional heterostructure

“…Among them, tellurium, a quasi-2D semiconductor, with a theoretical band gap of ~0.35 eV in bulk and ~1 eV in monolayer have a trigonal crystal structure. Distinctively, it possesses a number of 1D helical chains of Te atoms stacking together via weak van der Waals (vdWs) force along c-axis, leading to the mixed formation type of wires and nanosheets [12]. Experimentally, Te exhibits excellent properties such as a recorded high hole mobility (~700 cm 2 /Vs), remarkable air stability (over two months), pristine anisotropic structure ( anisotropic ratio of mobility~1.43) and broadband absorption spectrum (520 nm-3.39 μm), which makes it a potential candidate for future electronics and optoelectronics [13][14][15][16][17].…”

Anisotropic optical responses of layered thallium arsenic sulfosalt gillulyite

“…Since the successful demonstration of creating stable monolayer and few-layers van der Waals materials in 2004 4 , substantial efforts have been dedicated in exploring their prospects in advancing technological innovations ranging from energy storage to electronic and optoelectronic devices 5 – 8 . Nevertheless, the collection of the explored 2D materials is primarily confined to mono- and binary-element materials 9 – 11 such as black phosphorous, bismuth, tellurium, antimony, GeS, GeAs, ReS 2 , and transition metal dichalcogenides. However, to meet the requirement of future electronic and optoelectronic technologies, it is imperative to expand the landscape of the existing library of mono- and binary-element materials to multi-element 2D materials 9 , 12 .…”