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Low-dimensional semiconductor materials, encompassing two-dimensional (2D), one-dimensional (1D), and zero-dimensional (0D) systems, have garnered significant interest as key components for advanced electronic and optoelectronic technologies owing to their unique structural and physicochemical properties. A variety of 2D materials, such as transition metal dichalcogenides and black phosphorus, together with 1D nanowires, have demonstrated remarkable performance in devices including field-effect transistors, photodetectors, and flexible electronics. In hybrid architectures that integrate 0D materials with 1D or 2D structures, the incorporation of 0D components has been shown to substantially enhance device functionality. This chapter provides an overview of the most widely investigated classes of low-dimensional materials and their applications in electronic, optoelectronic, and flexible device platforms. It begins with a discussion of one of the most versatile 1D nanomaterials, carbon nanotubes (CNTs), and their integration into various electronic systems, such as field-effect transistors, logic circuits, and flexible thin-film transistors. Subsequently, the chapter addresses two-dimensional molybdenum disulfide (MoS 2 ) in a range of device architectures, including flexible configurations, along with recent advances achieved under different operating conditions. The insights presented here are intended to support the design and development of next-generation multifunctional devices with improved performance. In flexible electronics, where both high electrical efficiency and mechanical robustness are essential, low-dimensional materials offer distinct and compelling advantages.