Applications of 2D-Layered Palladium Diselenide and Its van der Waals Heterostructures in Electronics and Optoelectronics

Abstract

The rapid development of two-dimensional (2D) transition-metal dichalcogenides has been possible owing to their special structures and remarkable properties. In particular, palladium diselenide (PdSe2) with a novel pentagonal structure and unique physical characteristics have recently attracted extensive research interest. Consequently, tremendous research progress has been achieved regarding the physics, chemistry, and electronics of PdSe2. Accordingly, in this review, we recapitulate and summarize the most recent research on PdSe2, including its structure, properties, synthesis, and applications. First, a mechanical exfoliation method to obtain PdSe2 nanosheets is introduced, and large-area synthesis strategies are explained with respect to chemical vapor deposition and metal selenization. Next, the electronic and optoelectronic properties of PdSe2 and related heterostructures, such as field-effect transistors, photodetectors, sensors, and thermoelectric devices, are discussed. Subsequently, the integration of systems into infrared image sensors on the basis of PdSe2 van der Waals heterostructures is explored. Finally, future opportunities are highlighted to serve as a general guide for physicists, chemists, materials scientists, and engineers. Therefore, this comprehensive review may shed light on the research conducted by the 2D material community.

Enhanced Raman scattering on two-dimensional palladium diselenide

“…Recently, PdSe 2 has attracted extensive research interest due to its intriguing physical properties such as layer-dependent bandgap, in-plane optical anisotropy, magnetic transport and good stability. 18,19 Importantly, the high carrier mobility 20 and the large density of states (DOS) near the Fermi levels 21 imply that 2D PdSe 2 can form via a strong charge transfer interaction with the analyte and therefore has the potential to become an excellent substrate for Raman enhancement. Furthermore, the strong anisotropic properties and excellent air-stability make PdSe 2 an ideal system to study the fundamental processes of charge interactions and chemical enhancement.…”

Graphene-Based Field-Effect Transistor for Ultrasensitive Immunosensing of SARS-CoV-2 Spike S1 Antigen

“… 28 , 29 Graphene is a hexagonal two-dimensional (2D) material that has outperformed other nanomaterials in the construction of sensitive biosensors. 29 − 34 Due to their immense potential, graphene-based FETs are successfully employed for the development of various diagnostic platforms. 35 − 37 …”

Revealing and Controlling Energy Barriers and Valleys at Grain Boundaries in Ultrathin Organic Films

“…We have focused our work on a prototypical perylene‐diimide semiconductor, an organic dye which is often used in optoelectronic devices, but the general concept of valleys and barriers and their presence in thin films may also hold for other materials used as transport layers in OLEDs, OPV, and OFETs. In addition, the insights from this work may prove useful for researchers investigating charge transport in other optoelectronic materials systems such as perovskites, [ 57 ] metal oxides, [ 58 ] and transition metal dichalcogenides, [ 59,60 ] where grain boundaries might occur and lead to loss in transport or energy transformation processes.…”