Novel Cu1+xMn1-xSeTe nanostructure fabrication by simple microwave synthesis for potential photodetection and dielectric applications

Chalcogenide compounds featuring transition metals have garnered significant interest due to their remarkable properties in various optoelectronic and dielectric applications. This study utilized a straightforward microwave synthesis technique to fabricate Cu_1+xMn_1-xSeTe (CMST) nanomaterials by varying the concentrations of Cu and Mn. Structural analysis confirmed the presence of two distinct ternary crystalline phases: Cu₂MnSe₂ and Cu (SeTe)₂. Further examination through Raman spectroscopy revealed unique vibrational modes within the CMST nanostructure, characterized by a shift of active modes towards lower wave numbers. Surface morphology investigations indicated a nanoparticle-like structure, while optical measurements displayed a notable blue shift in the absorption edge, leading to an enhancement of the optical bandgap. Additionally, theoretical calculations suggested that the refractive index decreased as the bandgap increased. Thermal analysis identified multiple endothermic and exothermic events, indicating structural modifications and changes in thermal properties associated with mass disintegration. Dielectric studies showed promising results, with improved performance observed at elevated temperatures and higher frequency ranges. A photo-response evaluation demonstrated that the Cu-rich CMST-1 material exhibited a higher current response under illumination. In contrast, reducing the Cu content while increasing the Mn concentration resulted in a slight decrease in the current value for the CMST material. ​These findings point to the potential applicability of CMST nanomaterials in optoelectronic devices, photodetectors, and dielectric applications.