Jianhua Hao

Emerging thin film technology

Department of Applied Physics

The Hong Kong Polytechnic University

Hung Hom, Hong Kong, P. R. China

Email: jh.hao@polyu.edu.hk

Biography

Jianhua Hao is a Chair Professor of Materials Physics and Devices in the Hong Kong Polytechnic University (PolyU). Jianhua Hao has published more than 340 international journal papers, including the recently published high-impact journal papers as corresponding author in Nature Materials, Nature Commun., Adv. Mater., JACS, Angew. Chem. Int. Ed., Chem. Soc. Rev., Adv. Energy Mater., Nano Energy, ACS Nano, Adv. Funct. Mater., and Nano Lett.. Prof. Hao has received "Natural Science Award by the Ministry of Education", “TechConnect Global Innovation Award”, “Special Merit Award and Gold Medal of Geneva”, and President’s Award in PolyU. He serves as an Associate Editor of InfoMat (Wiley). He is conferred as Hong Kong RGC Senior Research Fellow, Chang Jiang Scholar Chair Professor. He is elected as Fellow of the Optical Society (OSA Fellow), Fellow of Royal Society of Chemistry (FRSC), and Fellow of Institute of Physics (FInstP). His research focuses on (1) Functional thin-films, 2D materials and heterostructures; (2) Luminescence and phosphors for photonic, biomedical and nano energy applications.

Abstract for Presentation

Growth of Black Phosphorus Ultrathin Films on Mica Substrate by Pulsed Laser Deposition

Two-dimensional (2D) materials provide opportunities for developing semiconductor applications at atomistic thickness to break the limits of existing integrated circuit technology. Black phosphorus (BP), as a layered 2D semiconductor with controllable bandgap and high carrier mobility, is one of the most promising candidates for transistor devices at atomistic thickness. However, the lack of large-scale growth greatly hinders its development in devices. In this talk, I will introduce our progress on the growth of ultrathin BP on the centimetre scale through pulsed laser deposition (PLD). In this work, taking advantage of the ultrahigh homogeneity of the mica surface and the uniform distribution of BP clusters in the laser-generated physical vapour, we present a controllable and rapid PLD process to directly synthesize few-layered BP on mica substrate with high crystallinity and homogeneity. Furthermore, we made advances by fabricating BP-film-based centimetre-scale field-effect transistor (FET) arrays that exhibit appealing electrical performances. In addition to the growth of BP, PLD is particularly attractive for making some specific 2D materials and vdW heterostructures. This work was supported by the grants from the Research Grants Council of Hong Kong

(GRF no. PolyU 15301121) and National Natural Science Foundation of China (no. 51972279).  

References

[1] Z. Wu, Y. Lyu, Y. Zhang, R. Ding, B. Zheng, Z. Yang, S. P. Lau , X. H. Chen , J. Hao, Nat. Mater., 20 (2021), 1203.

[2] Z. Wu, J. Hao, npj 2D Mater Appl, 4 (2020), 4.