Microwave-Assisted\nSynthesis of MnSeTe Nanocomposite\nFlowers for Optoelectronic and Photoresponse Applications

The tuning of optical, morphological, and structural\nproperties\nthrough precise control of the size/thickness of transition-metal\nchalcogenide is one of the key aspects for practical applications.\nThe present study reports that the microwave-synthesized MnSe<sub>1+<i>x</i></sub>Te<sub>1–<i>x</i></sub> (MST) nanocomposite by altering Se and Te concentrations is studied\nfor optoelectronic applications. The gradual increase in its crystallinity\nthrough MnSe and MnTe<sub>2</sub> crystalline phases with an increase\nin Se/Te ratio is confirmed by the structural study. The existence\nof different vibrational modes in the sample with alteration in the\nmicrostructural region is confirmed by a Raman study. The morphology\nstudy shows the nanosheet (nSh) structure as formed for the as-prepared\nMST samples, confirming the formation of 2D nanomaterial. The nSh\nthickness gradually decreased with a decrease in the Se concentration\nand increased Te. The reduction of the optical band gap of nSh is\nreflected by shifting the absorption edge to a higher wavelength regime.\nThe refractive index values lie between 2.14 and 2.78 for different\nMST nSh as per theoretical calculation. The presence of various exothermal\nand endothermal peaks is confirmed by thermal analysis for the present\nsample. These materials undergo photodetection measurement, where\nthey illustrate commendable responsivity across a range of values:\n1.73, 8.88, and 28.88 nA W<sup>–1</sup>. Additionally, these\nmaterials showcase detectivity at levels of 1.14 × 10<sup>10</sup>, 2.52 × 10<sup>10</sup>, and 3.96 × 10<sup>11</sup> Jones,\nrespectively. The changes in different optical and structural parameters\nenable the material’s applicability in optoelectronic devices.