447 / 2019-03-13 04:41:31

Metal halide perovskites under high pressure

high pressure,halide perovskites,emergent properties

全体主题 > High Pressure Physics and Materials Science

Metal halide perovskite has emerged as a promising candidate for advanced photovoltaics and optoelectronics. Perovskite-based devices have revolutionized the prospects of next-generation solar cells and light-emitting diodes, achieving an impressive power conversion efficiency of 23.7% and an external quantum efficiency over 20%, respectively. However, challenges still remain including their low stability, and the lack of deep understanding of the structure–property relationships. Thus, novel strategies are highly needed to further our understanding and to enhance the stability and performance of these perovskites. In this talk, we will present our efforts in using pressure, to tune the structures and physical properties of halide perovskites. Using the state-of-the-art high-pressure techniques coupled with in situ synchrotron-based and in-laboratory characterization methods, we characterized the changes in their structural, electrical, and optical properties. Pressure-enhanced properties such as higher electron transport and stronger light absorption, as well as pressure-induced novel phenomena, were observed. The findings reveal that high pressure can potentially be able to realize enhanced and/or emergent properties of halide perovskites, and would further our understanding of the structure-property relationships.