15:00-16:30

Speaker:
 

T-4 Electronics and Optoelectronics Based on 2D Tellurium

Dr. Chaoliang Tan
The University of Hong Kong, Hong Kong, China

Abstract：
Layered two-dimensional (2D) semiconductors have shown great potentials in the fabrication of next-generation high-performance electronics and optoelectronics in last decade owning to their unique physical, optical and electronic properties. Tellurium (Te) is a newly emerging 2D p-type semiconductor with truly one-dimensional crystal structure, where single helical molecular chains are stacking together via van der Waals (vdW) interaction. The naturally terminated surfaces except for the two ends of helical chains endow Te with great advantages over conventional three-dimensional materials and even layered materials, thus making it very promising for fabrication of high-performance electronic and optoelectronic devices. In this Tutorial, I will present our recent works on electronics and optoelectronics based on 2D tellurium. First, I will present the fabrication of high-performance transistors, logic gates and circuits based on Te nanobelts grown atomically flat h-BN flakes and evaporated Te thin films. Then, I will present the fabrication of high-performance short-wave infrared photodetectors based on Te nanoflakes and evaporated alloyed Se_xTe1_-x thin films with tunable bandgaps. Finally, I will present the fabrication of electronic/optoelectronic memory devices based on Te-based vdW heterostructures for in-sensor reservoir computing.

Bio：

Dr. Chaoliang Tan

Dr. Chaoliang Tan is an Assistant Professor in the Department of Electrical and Electronic Engineering at The University of Hong Kong (HKU EEE), HKSAR, China. He received his PhD degree under the supervision of Prof. Hua Zhang in Materials Science from Nanyang Technological University (Singapore) in 2016. After working as a Research Fellow in the same place for about one year, then he worked as a Postdoc Research Fellow with Prof. Ali Javey in Department of Electrical Engineering and Computer Sciences at University of California, Berkeley for two years. He has been working as an Assistant Professor in the Department of Electrical Engineering/Chemistry at City University of Hong Kong, HKSAR, China for three years before he joins HKU EEE in 2023. His current research interests mainly focus on the following three directions at CityU: (1) 2D materials (e.g., nanoflakes, thin films and their van der Waals heterostructures) for electronics (transistors, logic gates and circuits) and optoelectronics (e.g., photodetectors and imaging sensor systems). (2) Fabrication of electronic/optoelectronic memory devices based on 2D materials (e.g., nanoflakes, thin films and their van der Waals heterostructures) for in-sensor reservoir computing. (3) Structural engineering (e.g., defect, phase, interlayer distance, etc.) of layered nanomaterials (e.g., TMDs, layered metal oxides and LDHs) for biomedical applications (e.g., cancer therapy and bone repairing/regeneration). He has authored or co-authored over 150 SCI papers (41 ESI Highly Cited Papers) on journals like Nat. Nanotechnol., Nat. Mater., Nat. Rev. Mater., Nat. Commun., Adv. Mater., etc. The total citation of his published papers is over 24,700 with a H-index of 70. Among them, more than 60 are first-authored or corresponding-authored papers, including Nat. Nanotechnol., Nat. Rev. Mater., Chem. Rev., Chem. Soc. Rev., Nat. Commun., J. Am. Chem. Soc., Angew. Chem. Int. Ed., Adv. Mater., Adv. Funct. Mater., ACS Nano, Nano-Micro Lett. and Small. He has been listed as the “Highly Cited Researcher” (Top 1%, Clarivate Analytics) in last five years (2018-2022) as well as “Top 2% Scientists in the world” by Stanford University in last three years (2020-2022). He also received the NSFC Excellent Young Scientist Fund (HK & Macau) in 2021.