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Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films

Titelangaben

Li, Cheng ; Zhong, Yu ; Luna, Carlos Andres Melo ; Unger, Thomas ; Deichsel, Konstantin ; Gräser, Anna ; Köhler, Jürgen ; Köhler, Anna ; Hildner, Richard ; Hüttner, Sven:
Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films.
In: Molecules. Bd. 21 (2016) Heft 8 . - No. 1081.
ISSN 1420-3049
DOI: https://doi.org/10.3390/molecules21081081

Abstract

Inorganic-organic halide organometal perovskites have demonstrated very promising performance for opto-electronic applications, such as solar cells, light-emitting diodes, lasers, single-photon sources, etc. However, the little knowledge on the underlying photophysics, especially on a microscopic scale, hampers the further improvement of devices based on this material. In this communication, correlated conventional photoluminescence (PL) characterization and wide-field PL imaging as a function of time are employed to investigate the spatially- and temporally-resolved PL in CH3NH3PbI3−xClx perovskite films. Along with a continuous increase of the PL intensity during light soaking, we also observe PL blinking or PL intermittency behavior in individual grains of these films. Combined with significant suppression of PL blinking in perovskite films coated with a phenyl-C61-butyric acid methyl ester (PCBM) layer, it suggests that this PL intermittency is attributed to Auger recombination induced by photoionized defects/traps or mobile ions within grains. These defects/traps are detrimental for light conversion and can be effectively passivated by the PCBM layer. This finding paves the way to provide a guideline on the further improvement of perovskite opto-electronic devices.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: perovskite solar cells; photoluminescence; intermittency; Auger recombination;
ion migration; passivation; blinking; Methylammonium Lead Halide; methylammonium lead iodide
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 15 Sep 2016 08:43
Letzte Änderung: 15 Sep 2016 08:43
URI: https://eref.uni-bayreuth.de/id/eprint/34734