Abstract
Of late, tremendous research efforts have been made to obtain Pb-free low-toxicity halide perovskites. In this regard, the Sn-based perovskite is the focus of attention because of its properties being similar to those of Pb. This paper explores the fundamentals of temperature-induced dynamics of localized excitons in mixed Pb–Sn based CH3NH3Pb1−xSnxI3 perovskite materials. A quantitative model using the Monte Carlo simulation of exciton hopping and relaxation is developed to compute the photoluminescence (PL) peak energy, in addition to the PL line-width over a temperature regime of 10 K–300 K. The temperature-induced changes in the bandgap expansion allow the quantitative fit of our calculation to the experimental results. We show that the PL peak energies in CH3NH3PbI3 and CH3NH3Pb1−xSnxI3 are blue shifted due to the fact that the excitons are localized with higher energy localized states with increasing temperatures. It has also been found that the amount of redshift in PL peak energy decreases with an increase in Sn contents while the full width at half maximum increases in increased Sn content perovskite materials. These results give a deep insight into the exciton dynamics in CH3NH3Pb1−xSnxI3, further aimed at efficient applications in optoelectronic devices.
Highlights
In recent times, perovskite materials, in particular, the organic– inorganic lead (Pb) halide family, have drawn significant attention as promising light-harvesting materials for photovoltaic cells owing to their recorded efficiency of up to 24.2% and 28%.1 These materials offer immense potentiality in emitting devices including light emitting diodes (LEDs) and LASER diodes.2–4 Colossal magnetoresistance, ferro-electricity, superconductivity, charge ordering, spin-dependent transportation, high thermo-power, and the interplay of structural, magnetic, and transport properties5 are the commonly reported features in this family
It has been found that the amount of redshift in PL peak energy decreases with an increase in Sn contents while the full width at half maximum increases in increased Sn content perovskite materials
The temperature-induced dynamics of localized excitons in CH3NH3PbI3, CH3NH3SnI3, and mixed Pb–Sn based CH3NH3Pb1−xSnxI3 perovskites have been explored, considering exciton hopping and recombination phenomena simulated by the Monte Carlo technique
Summary
Perovskite materials, in particular, the organic– inorganic lead (Pb) halide family, have drawn significant attention as promising light-harvesting materials for photovoltaic cells owing to their recorded efficiency of up to 24.2% (single junction) and 28% (multiple junctions). These materials offer immense potentiality in emitting devices including light emitting diodes (LEDs) and LASER diodes. Colossal magnetoresistance, ferro-electricity, superconductivity, charge ordering, spin-dependent transportation, high thermo-power, and the interplay of structural, magnetic, and transport properties are the commonly reported features in this family. Perovskite materials, in particular, the organic– inorganic lead (Pb) halide family, have drawn significant attention as promising light-harvesting materials for photovoltaic cells owing to their recorded efficiency of up to 24.2% (single junction) and 28% (multiple junctions).. Perovskite materials, in particular, the organic– inorganic lead (Pb) halide family, have drawn significant attention as promising light-harvesting materials for photovoltaic cells owing to their recorded efficiency of up to 24.2% (single junction) and 28% (multiple junctions).1 These materials offer immense potentiality in emitting devices including light emitting diodes (LEDs) and LASER diodes.. The effects of temperature induced exciton dynamics and the exciton–phonon interaction on the PL behavior are investigated The results of this extensive research work provide in-depth insights into the emission properties of this important class of Pb-free halide perovskites
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