2D anisotropic materials, such as black phosphorus, ReS2, and GaTe, have been shown to exhibit exciting direction- and polarization-sensitive material properties. Highly crystalline chemical-vapor-transport-grown ZrS3 crystals exhibit large optical-absorption-coefficient anisotropy, which doubles under resonance conditions. The observed optical anisotropy manifests itself in angle-resolved photocurrent density polar plots with dichroic ratio (Ipb/Ipa) of 1.73 excited by a laser source of λ = 450 nm and 1.14 by λ = 532 nm. The optical absorption and electronic dichroic response are fully explained through detailed band structure and polarization-sensitive optical-absorption-spectrum calculations. Not only is the family of 2D anisotropic semiconductors expanded into Zr-based trichalcogenides but fundamental insights on how crystalline anisotropy, optical absorption dichroism, and generated photocurrents are interrelated in van der Waals Zr-based trichalcogenides materials are also provided.
- 2D anisotropic semiconductors
- angle-resolved absorption
- dichroic response
- quasi-1D materials
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials