Colloquium
Department of Physics, NCU
All-inorganic perovskite quantum dot light-emitting memories
Prof. Ya-Ju Lee (李亞儒)
Institute of Electro-Optical Engineering, NTNU
Date 2022.04.19 (Tue)
Place S4-625
Time 14:00-16:00
Abstract :
To date, all-inorganic metal halide perovskite materials, usually expressed as the chemical formula of ABX3, where A and B are metal cations with different sizes and X being a halide anion, have been intensively investigated due to their unique photophysical characteristics and high stability in the ambient environment. They can be easily processed by solution methods and be implemented in low-cost, mass-production of optoelectronic devices for high-scalable applications. Furthermore, all-inorganic perovskite halides have low activation energies for the migration of halide-ion vacancies under an applied bias, which enables the drifts of charged cations and anions per the poling direction and is believed to be the cause of several intriguing phenomena observed in the perovskite optoelectronic devices. In this talk, we will introduce our recent work in which a novel all-inorganic perovskite CsPbBr3 light-emitting memory (LEM) is demonstrated by monolithically integrating a perovskite light-emitting electrochemical cell (LEC) with a perovskite nonvolatile resistive random-access memory (RRAM). A physical picture, outlining the movements of each ion in the perovskite LEM and their reduction and oxidation processes under different bias scenarios by carefully investigating its intriguing electronic and optical characteristics, will also be discussed. We believe this work could also serve as a new paradigm for generating more advanced all-inorganic perovskite optoelectronics and new applications through the synergy of electronics and photonics