4 August 2022
10 am to 12 pm
Dr. Mao Wenxin
Monash University, Melbourne, Australia
Title: Crystallisation Control for Halide Perovskites and Their Applications in Optoelectronics
Lead halide perovskite (LHP) is a leading semiconductor for a new generation of solar cells, light-emitting devices and photodetectors. More complex applications, such as lasers and electro-optic modulators require the use of monocrystalline perovskite materials to reach their ultimate performance levels. Many optoelectronic applications require the ability to tune the semiconductor bandgap. The bandgap of LHPs can be tuned across the visible and near-infrared regions by controlling the halide ratio. Still, stability remains an ongoing issue owing to the soft lattice and high ionic diffusivity. In this talk, Dr. Mao will provide insights into these questions based on our research in a range of lead halide perovskite materials, from hybrid to pure inorganic and from 3D to 2D perovskites. He will describe how his team used a solution-based method to guide the growth of single-crystalline perovskite crystals with controllable morphology, composition, and structure. He will further discuss how his team applied the mixed halide perovskite single crystals to study a critical question in applying them to tandem solar cells, the light-induced phase segregation effect. In the end, Dr. Mao will discuss the potential and future applications with these highly-crystalline perovskite materials, including waveguide devices, electro-optical modulators (EOM), X-ray detectors, and solar cells.
Dr Wenxin Mao is an ACAP and ACEx Research Fellow at Monash University. He received his Ph.D in Chemical and Biological Engineering from Monash University in 2019. His research focuses on designing semiconductor materials with different dimensions for various optoelectronic applications, including solar cells, LEDs, photodetectors and X-Ray detectors; crystallization control for bulk crystals and thin films, and studying their optical and electrical properties through various techniques, including single crystal diffraction analysis, confocal microscopy and widefield microscopy, Raman microscopy, and time dependent microspectroscopy. He has a track record of high-quality research with regular publications in top ranked journals, including Nature Materials, Advanced Energy Materials, Angewandte Chemie International Edition, Advanced Functional Materials, Advanced Science et.al. He has attracted more than AUD 500,000 from Australian Renewable Energy Agency and Australian Synchrotron.