Phase Transition Induced Carrier Mass Enhancement in 2D Ruddlesden-Popper Perovskites

Abstract

There is a variety of possible ways to tune the optical properties of 2D perovskites, though the mutual dependence between different tuning parameters hinders our fundamental understanding of their properties. In this work we attempt to address this issue for (C${}_n$H${}_{2n+1}$NH${}_3$)${}_2$PbI${}_4$ (with n=4,6,8,10,12) using optical spectroscopy in high magnetic fields up to 67T. 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 magnetic field providing strong evidence for the phonon related nature of the observed side bands.

arXiv commentJus accpeted in ACS Energy Letters (https://doi.org/10.1021/acsenergylett.9b01435)

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Cited by in corpus (4)

• Fast and anomalous exciton diffusion in two-dimensional hybrid perovskites
• Tailoring Hot Exciton Dynamics in 2D Hybrid Perovskites through Cation Modification
• Local energy landscape drives long exciton diffusion in 2D halide perovskite semiconductors
• Exciton-Selective Phonon Coupling in a Lead Halide Perovskite