Dr. Jiandong Fan
Professor, Institute of New Energy Technology, College of Information Science and Technology, Jinan University, China

Speech Title: All-Inorganic CsPbI3-xBrx Perovskite Solar Cells with High Efficiency and Excellent Thermal-Stability

Abstract: All-inorganic perovskite solar cells (PSCs) provide a promising solution to tackle the thermal-instability issue of organic-inorganic hybrid PSCs. To prepare uniform and pinhole-free CsPbI3-xBrx thin film, we propose a two-step temperature-control process, which can well control the crystallization dynamics of Cs-based inorganic perovskite thin film. The as-fabricated CsPbIBr2 PSC is demonstrated to show excellent air stability. Moreover, the all-inorganic device can withstand high temperatures up to 160 °C. Further work aiming to enhance the efficiency of all-inorganic PSCs was performed, we obtained the champion power conversation efficiency (PCE) of 13.5 % with output PCE remarkably stable at 12% using CsPbI2Br perovskite material, which largely outperformed the organic-species-containing PSCs. In addition, we present a novel thermal radiation heating method (TRHM) that further improves the uniformity of the perovskite thin films. Our approach allows to obtain all-inorganic InCl3:CsPbI2Br PSCs with a champion power conversion efficiency 12.02% for a large area device (1.06 cm2). By which, the structural reconstruction of CsPbI2Br perovskite in highly stable and square-centimeter all-inorganic perovskite solar cells is carefully explored.

The present study opens a new direction in the development of inverted all-inorganic perovskite solar cells with highly thermal stability and efficiency, which will prove to be an important step for ongoing developments in perovskite solar cells.

Keywords: All-inorganic perovskite solar cells; Thermal stability; Structure.