报告摘要

Metal halide perovskites are promising for use in many optoelectronic devices because perovskites show efficient emission and have bandgap tunability, high carrier mobility, and long carrier diffusion even in polycrystalline films fabricated with low-cost solution processing. First I discuss our recent results of hybrid perovskite-based devices, which include solar cells, light-emitting diodes, field-effect transistors, and laser devices. In transistors with large perovskite crystals, we obtained very high hole and electron mobilities of 50-100 cm2/V s, along with excellent air and bias stability. Next, we introduce organic light-emitting diodes, in which perovskites are used as host or carrier transport layers. With perovskite transport layers, we demonstrated that device thickness was increased by more than ten times without increasing driving voltage and decreasing external quantum efficiency or operational durability and that our two-micrometer-thick devices had very high external quantum efficiencies of ~40%. The energy transfer from a perovskite to an organic emitter overcame the singlet generation efficiency limit 25% for fluorescent organic light-emitting diodes, opening a way to the fabrication of higher-performing devices at a lower cost in the future.

报告人简介：2016−present: Associate Professor, Molecular Photoconversion Devices Division, International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan 2014−2016: Associate Professor, Center for Organic Photonics and Electronics Research, Kyushu University, Fukuoka, Japan 2014−present: Group Leader, Japan Science and Technology Agency, ERATO, Adachi Molecular Exciton Engineering Project, Kyushu University, Fukuoka, Japan 2008−2014:Assistant Professor, Japan Advanced Institute of Science and Technology, Ishikawa, Japan. 2005, PhD, Kyusyu University, Japan