**Abstract**

2D Transition-Metal Dichalcogenides (TMDs) have been widely considered as a promising material for future optoelectronics due to the strong light-matter interaction, fantastic electronic properties and environmental stability. However, the relatively large bandgap and low mobility of conventional TMDs (such as MoS2 and WS2) limit their applications in infra optoelectronics and high-speed photodetection. In this chapter, we introduce a new type of group-10 noble TMDs (NTMDs), which exhibit outstanding properties such as unique structural phase, widely tunable energy gap and high mobility. Till now, various NTMDs-based photodetectors have been realized with ultrabroad detection waveband (200 nm to 10.6 μm), fast response time, high responsivity and detectivity, and polarization sensitivity. NTMDs have been excellent potential candidates for next-generation photodetection devices with high-performance, wafer-scalability and flexibility.

**Keywords:** noble-transition-metal dichalcogenides, 2D materials, photodetectors, optoelectronics, van der Waals
