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Descripción
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| We investigate the possibility that formation of ferroelectric domains in CH3NH3PbI3 can separate the diffusion pathways of electrons and holes. This hypothesis has been proposed [1] to explain the large recombination time and the remarkable performance of the solar cells of hybrid perovskites. We find that a two-dimensional hole confinement in CH3NH3PbI3 is possible under room temperature conditions. Our models of the tetragonal phase show that the alignment of dipole layers of organic cations induces the confinement of holes but not of electrons. We find that holes can localize on PbI2 planes closest to CH3 groups. This behavior does not change even by varying the strength of the ordered dipoles. The confinement of holes is enhanced by the deformation of the inorganic PbI3 sublattice. For the conduction band electrons, the inorganic sublattice distortions counteract the effect of the oriented organic dipoles preventing the localization of the electrons. The positive charges of CH3NH3+ cations, at the locations driven by its aspherical shape, are responsible of the electron-hole asymmetry. | |
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Internacional
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Si |
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Nombre congreso
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International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO) -Perovskite Thin Film Photovoltaics (ABXPV18) |
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Tipo de participación
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960 |
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Lugar del congreso
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Rennes (Francia) |
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Revisores
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Si |
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ISBN o ISSN
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CDPO8UPM |
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DOI
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10.29363/nanoge.abxpvperopto.2018.032 |
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Fecha inicio congreso
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27/02/2018 |
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Fecha fin congreso
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01/03/2018 |
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Desde la página
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Hasta la página
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Título de las actas
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Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO) Perovskite Thin Film Photovoltaics (ABXPV18) |