Recent Advances in the Functional 2D Photonic and Optoelectronic Devices

Abstract

Abstract2D layered materials such as graphene, black phosphorus (BP), transition metal dichalcogenides (TMDCs), and their hybrid systems exhibit wide coverage of bandgaps, unique crystal structures, and the facile integration for potential applications in photonic and optoelectronic devices. In the recent two years, various 2D functional systems have been developed with novel optoelectronic properties, thereby expanding the functional applications. Beyond the speed, efficiency, or sensitivity, these 2D crystals can offer additional advantages and distinct applications in terms of spectrum range, polarization, intensity, and structural designs. The main contents here focus on optoelectronic and photonic devices with unique functional applications, especially mentioning areas as follows: long‐wavelength photodetector, 2D polarization‐sensitive photodetector, 2D optoelectronic memory, and 2D material‐based optical modulator. For each section, the device design, performance, and operational principles are investigated and systematically discussed. Finally, the current research status is summarized and perspectives on possible applications in future are offered.

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

“…Nonlinear photonics is one of the most brilliant fields in the application of layered materials . This is because, physically speaking, most layered materials have excellent nonlinear optical properties; in terms of practical demand, finding suitable optical materials has always been an eternal theme in the field of nonlinear photonics.…”

Two‐dimensional heterostructure promoted infrared photodetection devices

“…The pristine single 2D materials are usually limited for real optoelectronics by the natural limitation such as low optical adsorption, inherent band structure, and density of states. Due to the nature of atomically thickness and weak van der Waals (vdW) force bonded intralayer, 2D materials provide the chance to design the dangling‐free interlayer architecture, or the 2D heterostructure (2DH) to solve short comings of pristine materials . The fabricated 2DHs are showing fascinating behaviors in the following aspects: (a) atomically thin thickness and no‐dangling surface give rise to the controllable generation, confinement, and transportion of photocarriers, (b) easily tunable band alignment, (c) ability to modulate the density of states, and (d) strength to leverage the merit from different materials.…”

Symmetry‐Reduction Enhanced Polarization‐Sensitive Photodetection in Core–Shell SbI3/Sb2O3 van der Waals Heterostructure

“…Symmetry‐reduction as a method of disordering atoms to change the density of states in a certain direction by heterostructure enhances the dichroic ratio. Therefore, symmetry‐reduction as a valid method of enhancing structural anisotropy can numerously enrich the family of in‐plane anisotropy semiconductors and has extensively utilized in polarization‐sensitive photodetection …”