Descripción del proyecto
Perovskitas de haluro metálico para mejorar las aplicaciones optoespintrónicas
Las propiedades optoelectrónicas de los semiconductores se controlan mediante la carga, pero los materiales magnéticos funcionan por espín. La combinación de estas funcionalidades puede dar lugar a nuevas y potentes aplicaciones y a unas grandes mejoras de rendimiento en optoespintrónica. El reto de desarrollar un nuevo sistema estriba en coordinar los espines y controlar las propiedades físicas de los estados excitados. El proyecto financiado con fondos europeos TWIST tiene como objetivo probar semiconductores altamente luminiscentes para controlar el espín y emitir quirales con propiedades combinadas de materiales ferromagnéticos y semiconductores excelentes para ledes de espín eficientes a temperatura ambiente. TWIST desarrollará nuevos métodos para controlar el espín y la quiralidad en perovskitas de haluros metálicos dopadas con elementos y moléculas magnéticos, así como en estructuras quirales. Los resultados de TWIST fomentarán aplicaciones optoespintrónicas con nuevas funcionalidades y un menor consumo de energía.
Objetivo
The translation of chirality from molecular to bulk inorganic systems opens many possibilities for new phenomena. The properties of chiral electronic states are interesting scientifically and attractive for applications. While optoelectronic properties of semiconductors are controlled by charge, magnetic materials function by spin. If a material can combine these functionalities, powerful novel applications and large gains in performance are possible in opto-spintronics. Yet, existing magnetic semiconductors often show lower optoelectronic quality or work at low temperature. Development of new systems is a scientific challenge due to the required coordination of spins and control of physical properties of excited states, while minimizing defects.
TWIST will demonstrate novel highly-luminescent semiconductors for spin-control and chiral emission that show combined properties of ferromagnets and excellent semiconductors for efficient spin-LEDs at room temperature. To achieve this, TWIST will develop new approaches to control spin and chirality in doped metal-halide perovskites (MHPs) with magnetic elements and molecules, also in chiral superstructures.
In 2014, I reported that MHPs are exceptionally bright emitters, which underpins their tolerance to defects and chemical variation, and which recently enabled remarkable doping with transition-metals. Optical spin-control and chiral emission are possible from spin-orbit coupling and Rashba effects, which will enhance spin-order for Curie temperatures towards room temperature. These exceptional properties of MHPs, which have already produced efficient solar cells and LEDs, provide now a unique opportunity for my project.
TWIST will use state-of-the art optical and electronic techniques to unravel the fundamental mechanisms how magnetic moments, light and chiral states order and interact in MHPs. The results of TWIST will instigate opto-spintronic applications with novel functionality and lower energy consumption.
Ámbito científico
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ERC-STG - Starting GrantInstitución de acogida
69117 Heidelberg
Alemania