Abstract:

While scaling the dimensions of semiconductors down to nano scale, novel properties, such as ultrahigh specific surfaces, quantum confinement effect and strong light-matter interaction, will show out. Among the low dimensional structures, two-dimensional (2D) semiconductors may lead the next resolution in electronics and optoelectronics due to their compatibility with traditional micro-fabrication techniques as well as flexible substrates. Up to now, both layered and non-layered materials have been demonstrated to present in 2D geometry. For the former, even though big breakthroughs have been made, especially on transition metal dichalcogenides (TMDCs), more systematical and deeper studies are needed. Noticeably, inspired by the success of 2D layered materials and the fact that many materials with significant functions have non-layered crystal structures, 2D non-layered materials have attracted increasing attentions.
In addition, with potential applications in high-speed topological logic devices, the recently discovered topological crystalline insulators (TCIs) have attracted considerable interests. However, owing to the intrinsic istropic crystalline structure, it is not an easy job to synthesize these TCIs into low-dimensional structures, in which the topological surface transport may be strongly enhanced. As a result, reseach on TCIs is limited. Based on above challenges and motivations, our research focuses on the design, synthesis and applications of low dimensional metal chalcogenides semiconductors. In this talk, I will present our recent progress on the following two aspects:
(1) 2D layered and non-layered metal chalcogenide semiconductors: controllable synthesis, properties, electronic and optoelectronic applications.
(2) Topological crystalline insulators: synthesis dynamics and surface transport.
 
 
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