Phase-Transition-Induced Carrier Mass Enhancement in 2D Ruddlesden–Popper Perovskites
Source abstract
Abstract
There are a variety of possible ways to tune the optical properties of 2D perovskites, though the mutual dependence among different tuning parameters hinders our fundamental understanding of their properties. In this work, we attempt to address this issue for (CnH2n+1NH3)2PbI4 (with n = 4, 6, 8, 10, 12) using optical spectroscopy in high magnetic fields up to 67 T. Our experimental results, supported by DFT calculations, clearly demonstrate that the exciton reduced mass increases by around 30% in the low-temperature phase. This is reflected by a 2–3-fold decrease of the diamagnetic coefficient. Our studies show that the effective mass, which is an essential parameter for optoelectronic device operation, can be tuned by the variation of organic spacers and/or moderate cooling achievable using Peltier coolers. Moreover, we show that the complex absorption features visible in absorption/transmission spectra track each other in a magnetic field, providing strong evidence for the phonon-related nature of the observed side bands.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UGA-UPS-INSA, Grenoble and Toulouse, France
Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
Univ Rennes, ENSCR, INSA Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-35000 Rennes, France
Univ Rennes, INSA Rennes, CNRS, Institut FOTON, UMR 6082, F-35000 Rennes, France
Abteilung Ressourcenökologie, Helmholtz-Zentrum Dresden-Rossendorf, Forschungsstelle Leipzig, Permoserstrasse 15, 04318 Leipzig, Germany
Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
Funding
Ministerstwo Nauki i Szkolnictwa Wyzszego · Narodowe Centrum Nauki · Minist?re de l'Enseignement Sup?rieur et de la Recherche · IDEX Toulouse
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