Project Details
Projekt
Many-body interactions in two-dimensional halide perovskites: exciton-electron complexes & electron-phonon coupling
Subject Area
Experimental Condensed Matter Physics
Theoretical Condensed Matter Physics
Theoretical Condensed Matter Physics
Term
since 2019
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 424709454
The broad interest of the research community in inorganic-organic perovskites is fueled by a rich variety of nanostructures that can be formed within this class of materials. Their exceptional chemical tunability and structural diversity offer promising pathways to explore intriguing new phenomena and additional functionalities for applications. A prominent member of this family are two-dimensional (2D) Ruddlesden-Popper compounds. 2D perovskites promise to accelerate the search for improved stability and performance of optoelectronic devices, offer potential for high-efficiency photovoltaic and light-emitting applications, and serve as ideal platform to explore and ultimately tune many-body physics in condensed matter. It motivates conceptual scientific investigations in regard to their optoelectronic properties due to particularly strong interactions and a confluence of various effects that occur on multiple time-scales, playing a major role in these systems. Consequently, key material properties are essentially rooted in many-particle physics that we plan to explore and ultimately control in the proposed research. The main goal of our project is to gain fundamental insight into the nature of coupled electronic and vibrational excitations in 2D perovskites. We aim to develop a comprehensive understanding of interactions between excitonic and free-carrier systems in 2D perovskites, studying the impact of exciton-electron mixtures on the energy structure of optical excitations and their transport behavior. Reliable experimental and theoretical protocols will be established in order to determine the fundamental role of the electron-, exciton- and phonon-phonon coupling for structurally complex 2D perovskites and their impact on technologically relevant properties. Finally, we will move towards realizing advanced concepts to tune these coupling phenomena by combining external control of free carrier densities, electrical gating, and chemical synthesis strategies towards rational improvement of optoelectronic properties of 2D perovskites. To address these goals, we will merge state-of-the art material fabrication with advanced experimental techniques based on time-resolved microscopy and with high-level theoretical methodology for investigations of electronic, optical, and vibrational properties as well as their interplay. The proposed scientific agenda, outlined in detail in the work programme, is aimed towards topical questions on the forefront of a rapidly growing research field. The combined experimental and theoretical efforts will allow us to successfully pursue these objectives towards key scientific and technological advances in the broad area of hybrid perovskite semiconductors.
DFG Programme
Priority Programmes
International Connection
United Kingdom
