Dr. Xu Liu obtained his PhD in the School of Photovoltaic and Renewable Energy Engineering of UNSW in 2018, and the ACAP Research Fellow, currently DECRA Fellow and Postdoctoral Fellow at UNSW. Dr. Xu Liu has focused his research on low-cost, high-efficiency thin film solar cells and tandem solar cells for more than eight years, researching on various energy materials, initially using earth-abundant chalcogenides semiconductor materials, and then inorganic-organic perovskite materials for solar photovoltaic applications.