2D Hybrid Nanostructured Dirac Materials for Broadband Transparent Electrodes

Abstract

Broadband transparent electrodes based on 2D hybrid nanostructured Dirac materials between Bi2 Se3 and graphene are synthesized using a chemical vapor deposition (CVD) method. Bi2 Se3 nanoplates are preferentially grown along graphene grain boundaries as "smart" conductive patches to bridge the graphene boundary. These hybrid films increase by one- to threefold in conductivity while remaining highly transparent over broadband wavelength. They also display outstanding chemical stability and mechanical flexibility.

Synthesis of WS2xSe2–2x Alloy Nanosheets with Composition-Tunable Electronic Properties

“…Two-dimensional (2D) layered materials are emerging as an exciting class of material system that has the potential to enable breakthroughs in fundamental materials science and create totally new technologies. − In general, a large family of layered materials (e.g., MoS 2 , WS 2 , NbSe 2 , and Bi 2 Te 3 ) in which the atomic layers are weakly bonded together by van der Waals interactions can be isolated into single- or few-layer nanosheets, allowing access to a wide range of physical properties at the atomic scale, such as metallic, semimetallic, semiconducting, insulating, topological insulating, superconducting, and thermoelectric properties. − ,− In particular, the layered transition metal dichalcogenides (TMDs) (e.g., MoS 2 , WSe 2 ) represent a large family of layered materials, many of which exhibit a tunable band gap that transits from an indirect band gap in bulk crystals to a direct band gap in monolayer nanosheets. − ,, These 2D nanosheets typically have well-defined crystalline structure with few surface dangling bonds that traditionally plague conventional semiconductor nanostructures. These 2D-TMDs have thus emerged as an exciting class of atomically thin semiconductors for a new generation of electronic, optoelectronic, and valleytronic devices, as well as ultrasensitive sensors. ,,− …”

Microcavity-Free Broadband Light Outcoupling Enhancement in Flexible Organic Light-Emitting Diodes with Nanostructured Transparent Metal–Dielectric Composite Electrodes

“…, nanotube, − graphene, , and conductive polymers), metallic nanostructures ( e.g. , conducting metal oxides, metal nanowires, − metal mesh, , topological insulators, metal/dielectric multilayer ,− ), and hybrid composite electrodes. , Among these alternatives, a metal–dielectric composite electrode (MDCE) has been regarded as an effective TCE for flexible devices in terms of mechanical flexibility, electrical conductivity, optical transparency, and large-area film uniformity. ,, …”

Chemical Intercalation of Topological Insulator Grid Nanostructures for High‐Performance Transparent Electrodes

“…Compared with indium tin oxide (ITO), the prototype material in the field of transparent electrode, topological electrodes exhibits good conductivity, broad and high transmittance, as well as excellent mechanical flexibility and chemical durability . Regarding the transparency and conductivity of TI electrodes, further improvements have been achieved by gridding Bi 2 Se 3 films and hybridizing Dirac materials between Bi 2 Se 3 and graphene . Despite these achievements, more efforts need to be devoted for better electrode performances.…”