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Molecules 2016, 21(8), 1081; doi:10.3390/molecules21081081

Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films

1
Organic and Hybrid Electronics, Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, Germany
2
Experimental Physics IV and Bayreuth Institute of Macromolecular Research, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, Germany
3
Centre for Bioinformatics and Photonics—CIBioFi, Calle 13 No. 100-00, Edificio 320 No. 1069 and Departamento de Fisica, Universidad del Valle, Cali 760032, Colombia
4
Experimental Physics II, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Pablo Docampo
Received: 15 June 2016 / Revised: 1 August 2016 / Accepted: 9 August 2016 / Published: 18 August 2016
(This article belongs to the Special Issue Perovskite Solar Cells)
View Full-Text   |   Download PDF [3074 KB, uploaded 18 August 2016]   |  

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. View Full-Text
Keywords: perovskite solar cells; photoluminescence; intermittency; Auger recombination; ion migration; passivation; blinking; Methylammonium Lead Halide; methylammonium lead iodide perovskite solar cells; photoluminescence; intermittency; Auger recombination; ion migration; passivation; blinking; Methylammonium Lead Halide; methylammonium lead iodide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, C.; Zhong, Y.; Luna, C.A.M.; Unger, T.; Deichsel, K.; Gräser, A.; Köhler, J.; Köhler, A.; Hildner, R.; Huettner, S. Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films. Molecules 2016, 21, 1081.

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