Real-Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites
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Otros documentos de la autoría: Li, Cheng; Guerrero, Antonio; Yu, Zhong; Gräser, Anna; Melo Luna, Carlos Andres; Köhler, Jürgen; Bisquert, Juan; Hildner, Richard; Huettner, Sven
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Título
Real-Time Observation of Iodide Ion Migration in Methylammonium Lead Halide PerovskitesAutoría
Fecha de publicación
2017Editor
WileyISSN
1613-6810; 1613-6829Cita bibliográfica
LI, Cheng, et al. Real‐Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites. Small, 2017, vol. 13, no 42.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://onlinelibrary.wiley.com/doi/10.1002/smll.201701711/fullVersión
info:eu-repo/semantics/submittedVersionPalabras clave / Materias
Resumen
Organic-inorganic metal-halide perovskites (e.g. CH3NH3PbI3-xClx) emerged as a promising opto-electronic material. However, the Shockley–Queisser Limit for the power conversion efficiency (PCE) of perovskite-based ... [+]
Organic-inorganic metal-halide perovskites (e.g. CH3NH3PbI3-xClx) emerged as a promising opto-electronic material. However, the Shockley–Queisser Limit for the power conversion efficiency (PCE) of perovskite-based photovoltaic devices has still not been reached, which was attributed to non-radiative recombination pathways, as suggested by photoluminescence (PL) inactive (or dark) areas on perovskite films. Although these observations have been related to the presence of ions/defects, the underlying fundamental physics and detailed microscopic processes, concerning trap/defect status, ion migration, etc., still remain poorly understood. Here we utilize correlated wide-field PL microscopy and impedance spectroscopy (IS) on perovskite films to in-situ investigate both the spatial and temporal evolution of these PL inactive areas under external electrical fields. We attribute the formation of PL inactive domains to the migration and accumulation of iodine ions under external fields. Hence we are able to characterize the kinetic processes and determine the drift velocities of these ions. In addition, we show that I2 vapor directly affects the PL quenching of a perovskite film, which provides evidence that the migration/segregation of iodide ions plays an important role in the PL quenching and consequently limits the PCE of organometal halide based perovskite photovoltaic devices. [-]
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Small, 2017, vol. 13, núm. 42.Proyecto de investigación
Financial support by the Bavarian State Ministry of Science, Research, and the Arts for the Collaborative Research Network ‘‘Solar Technologies go Hybrid’’ and Federal Ministry of Education and Research BMBF (03SF0484C) are gratefully cknowledged. RH, JK, and CAML acknowledge additional funding from the German Research Foundation DFG (GRK1640 and HI1508/2). Part of this research has been carried out at the Australian Synchrotron at the SAXS/WAXS beamline. A.G. and J.B. acknowledge funding from MINECO of Spain (MAT2016-76892-C3-1-R and RYC-2014-16809) and Generalitat Valenciana Project PROMETEOII/2014/020.Derechos de acceso
"This is the pre-peer reviewed version of the following article: LI, Cheng, et al. Real‐Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites. Small, 2017, vol. 13, no 42., which has been published in final form at https://doi.org/10.1002/smll.201701711. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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