Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.039
Publication date: 11th December 2017
The opto-electronic properties of 2D organic-inorganic perovskites are largely affected by the nature of the organic cation and the number of inorganic octahedrals layers in between the organic cation. It has been shown that varying the length of alkyl chains, valency, functioning group and thickness of if inorganic layers affect the band gap and effective confinement. There is a lack of understanding on how this changes affect the charge and excited state dynamics. In this work we have studied the charge and excited state dynamics of 2D organic-inorganic perovskites with different organic groups and thickness of layers by temperature dependent absorption, photo-luminescence and microwave conductivity measurements. We have found that properties such as mobility, yield of charge dissociation, exciton binding energy, and electronic transitions are also affected by the organic cation nature, thickness of inorganic layers and temperature. For example, in 2D (BA)2(MA)n-1PbnI3n+1 Ruddlesden-Popper hybrid perovskites, our combined experimental results show a clear increase of the mobility, probability of exciton dissociation and lifetime of charges with the thickness of the [(MA)n-1PbnI3n+1]2- slabs. The increase in mobility is consistent with DFT calculations that show a decrease of the effective mass of holes. In addition, the temperature trend of the yield of exciton dissociation was analyzed in the framework of the Saha equation to show that the exciton binding energies range between ~80 meV and ~370 meV depending on the thickness of the [(MA)n-1PbnI3n+1]2- slabs. Understanding these interactions will help to design 2D organic-inorganic perovskites with specific functionalities.
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