A photodetector based on the non-centrosymmetric 2D pseudo-binary chalcogenide MnIn₂Se₄

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Two-dimensional (2D) binary chalcogenides are known for their band gap properties and van der Waals structure, leading to applications in catalysis, spintronics, and optoelectronics.
• Ternary 2D chalcogenides offer enhanced chemical tunability for tailored material properties.
• While ordered A^IIB^III₂X^VI₄ systems like ZnIn₂S₄ are well-studied, disordered phases remain less explored.

Purpose of the Study:

• To present a novel photoelectrochemical (PEC) detector based on the pseudo-binary MnIn₂Se₄ system.
• To investigate the optoelectronic properties and performance of this disordered ternary chalcogenide.
• To explore the potential of MnIn₂Se₄ in advanced detector applications.

Main Methods:

• Fabrication of a photoelectrochemical (PEC) detector using MnIn₂Se₄.
• Optical measurements to characterize material properties.
• Density Functional Theory (DFT) calculations to determine bandgap nature.
• Performance evaluation of the PEC detector, including responsivity measurements.

Main Results:

• The bandgap of MnIn₂Se₄ was confirmed to be indirect through optical measurements and DFT calculations.
• The MnIn₂Se₄-based PEC detector demonstrated superior performance compared to parent compounds.
• A high responsivity value of 8.41 mA W^-1 was achieved.

Conclusions:

• Disordered MnIn₂Se₄ shows significant promise for photoelectrochemical applications.
• The material's performance surpasses that of related compounds, indicating potential for improved device efficiency.
• The non-centrosymmetric crystal structure may contribute to enhanced charge separation, warranting further investigation.