Carrier recombination kinetics in organometal trihalide perovskites thin films

Abstract

This work focuses on the description of recombination dynamics in hybrid lead iodide perovskites of composition methylammonium lead tri-iodide (MAPbI3). Time-resolved spectroscopy was used as main tool to investigate the carrier dynamics in these systems. Further a model was constructed, which is able to accurately reproduce the observed features of the observed dynamical features. Herein, we will present a series of spectroscopic experiments and we will discuss in detail their results. We will show how the insights on crucial properties of the perovskites, like their exciton binding energy, are necessary for a correct formulation of the model proposed. Later, we will explore various aspects of the model itself and guide the reader into the detailed analysis of each recombination pathway for each of the charges species involved. We aim with this work at providing a deeper understanding on the nature of the electronic and excitonic transitions in hybrid perovskites We believe that this can aid the perovskite photovoltaics community in developing a clear understanding of some of the important optoelectronic properties. We believe that this in turn will help the development of a more efficient generation of photovoltaic materials, in a historical moment where clean and renewable energy sources is of vital importance for the future of humankind.

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Identifiers

ORCID for Pavlos Lagoudakis: orcid.org/0000-0002-3557-5299

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