Two-dimensional (2D) transition metal dichalcogenides (TMDs) materials have attracted great attention from the laser photonic research community for their attractive properties for photonic devices applications, e.g. broad and tunable bandgap, high carrier mobility, and strong nonlinear absorption etc. Group 10 2D materials e.g. PtSe2, PdSe2 and PtS2 are newly developed 2D materials and they have been first demonstrated to be used for various laser photonic applications e.g. mode locking laser [1] and photodetectors [2-4]. Stable ultrafast laser pulses generated by using PtSe2 [1] and PtS2 saturable absorber used within a mode locking laser cavity. The results demonstrated the potential of group 10 2D materials used for non-linear optical applications. We have use the large-area semiconducting PtSe2 film to develop a high-performance photodetectors by combining with GaAs substrate. The device exhibits a broadband sensitivity from deep ultraviolet to near-infrared light. Such broadband photoresponse attributed to the semiconducting feature of PtSe2 [2]. The wafer-size PdSe2 film is also fabricated with controllable thickness by sputtering method. A PdSe2 material exhibits an evolution from semiconductor (monolayer) to semimetal (bulk forms). The ultra-broadband photodetectors formed by integrating PdSe2 film with n-Si. The fabricated heterojunction diode exhibits a high responsivity and specific detectivity with a broad spectral range from DUV to MIR (200 - 3044 nm) and fast response speed and he device performance can be further enhanced through the decoration of black phosphorus quantum dots on the detector surface [3]. Additionally, a self‐powered photodetector is fabricated with broadband response ranging from DUV to NIR (200 to 1550 nm) by combining FA 1−x Cs x PbI 3 perovskite with PdSe2 layer. The device is sensitive to polarized light with a large on/off ratio, a high responsivity and response speed. These demonstrated figures of merit are comparable with or much better than most of the previously reported perovskite detectors [4].

Dr. Yuen Hong TSANG received his BSc and PhD in Physics from School of Physics and Astronomy, the University of Manchester, UK in 2000 and 2004 respectively. Currently an associate professor in the Department of Applied Physics, The Hong Kong Polytechnic University, which focus on applied research and consultancy in applied physics including laser, optoelectronics and materials science. Dr. Tsang academic research interests cover the topics including, novel 2D materials or nano-structure used for optics and photonic devices, laser materials, high power lasers, novel materials for energy applications. He has published over 130 SCI journal articles with H-index of 29 and total citations of ~2900 in Scopus.