Formation of CdS/Sn Superlattice Nanowires and Room-Temperature Microcavity Stimulated Emission

Semiconductor superlattice nanowires are promising candidates for multifunctional optoelectronic devices due to their periodic structure and compositional modulation. However, the realization of superlattice nanowires for multiple microcavity nanolasers remains challenging. Here, we report a rational strategy for the synthesis of CdS/Sn superlattice nanowires by a chemical vapor deposition (CVD) approach. Structural characterization reveals periodic CdS and Sn segments along the nanowire axis. Spatially resolved microphotoluminescence measurements confirm multiple microcavities between the adjacent Sn nodes in a single nanowire. Additionally, a room-temperature single-mode laser is clearly observed from these superlattice nanowires, which shows a strong stimulated emission with a high-quality factor (∼1218). These findings suggest that the prepared CdS/Sn superlattice nanowires provide a versatile platform for light–matter interaction studies and can be used as an excellent optical gain medium for high-quality factor lasers.