Two-Dimensional [2D] Layered Materials, van der Waals Stacking of 2D Materials, Low-Dimensional Materials [LDMs], 2D Perovskites, Single Crystal Growth of Novel Materials, Nanoscale Devices [Transistors, Photodetectors, Solar Cells & LEDs], Flexible, Lightweight, and Foldable Optoelectronics, Bio-Sensors.