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Real-Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites

Title data

Li, Cheng ; Guerrero, Antonio ; Zhong, Yu ; Gräser, Anna ; Melo Luna, Carlos Andres ; Köhler, Jürgen ; Bisquert, Juan ; Hildner, Richard ; Hüttner, Sven:
Real-Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites.
In: Small. (25 September 2017) Issue 13 . - Eintrag 1701711 (10 Seiten).
ISSN 1613-6829
DOI: https://doi.org/10.1002/smll.201701711

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Organic–inorganic metal halide perovskites (e.g., CH₃NH₃PbI₃−xClx) emerge as a promising optoelectronic material. However, the Shockley–Queisser limit for the power conversion efficiency (PCE) of perovskite-based photovoltaic devices is still not reached. Nonradiative recombination pathways may play a significant role and appear as photoluminescence (PL) inactive (or dark) areas on perovskite films. Although these observations are 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 correlated wide-field PL microscopy and impedance spectroscopy are utilized on perovskite films to in situ investigate both the spatial and the temporal evolution of these PL inactive areas under external electric fields. The formation of PL inactive domains is attributed to the migration and accumulation of iodide ions under external fields. Hence, we are able to characterize the kinetic processes and determine the drift velocities of these ions. In addition, it is shown 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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Early view article: online version of record published before inclusion in an issue
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie - Univ.-Prof. Dr. Jürgen Köhler
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Graduate Schools > Bayreuth Graduate School of Mathematical and Natural Sciences (BayNAT) > Photophysics of Synthetic and Biological Multichromophoric Systems
Graduate Schools > Elite Network Bavaria > Macromolecular Science
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Graduate Schools
Graduate Schools > Bayreuth Graduate School of Mathematical and Natural Sciences (BayNAT)
Graduate Schools > Elite Network Bavaria
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 20 Oct 2017 10:15
Last Modified: 23 Oct 2017 06:08
URI: https://eref.uni-bayreuth.de/id/eprint/40091