Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.246
Publication date: 18th July 2019
Ruddlesden-Popper 2D hybrid perovskites (RPPs) present a great potential for optoelectronics devices such as solar cells and Light-Emitting Diodes (LED). [1,2] In particular, they show an improved stability in comparison to 3D halide perovskites. RPPs self-assembled in a natural quantum well structure, where the perovskite layers are sandwiched between large organic cations. We have investigated the exciton recombination dynamics at room temperature in pure phase RPPs crystals of (C6H5C2H4NH3+)2(CH3NH3)n-1PbnI3n+1 (n=1, 2, 3 and 4) (Figure 1) using time-resolved photoluminescence in a large range of power excitations. Upon photoexcitation, we observe the presence of an increasing fraction of out-of-equilibrium free carriers on a picosecond timescale, as the number of perovskite layers increases. The photoluminescence emission is then characterized by the recombination of excitons with long lifetime spanning on several tens of nanoseconds. In the low excitation regime, the PL decays are non-exponential due defect-assisted recombination. The density of defects decreases with the number of perovskite layers. In the high excitation regime, below the Mott transition, traps are saturated and many body effects become important. As observed in other 2D materials, Exciton-Exciton Annihilation is then the dominant recombination channel. The results lead to a better understanding of the sources of non-radiative losses in RPPs, which should be addressed to optimize the efficiency of future optoelectronic devices.
This project has received funding from the European Union’s Horizon 2020 programme, through a FET Open research and innovation action under the grant agreement No 687008.The work is supported by Agence Nationale pour la Recherche (EMIPERO project). J.S. Lauret is a junior member of the Institut Universitaire de France. J. Even is a senior member of the Institut Universitaire de France.
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