Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films
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 sc...
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MDPI AG
2016-08-01
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| Series: | Molecules |
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| Online Access: | http://www.mdpi.com/1420-3049/21/8/1081 |
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| author | Cheng Li Yu Zhong Carlos Andres Melo Luna Thomas Unger Konstantin Deichsel Anna Gräser Jürgen Köhler Anna Köhler Richard Hildner Sven Huettner |
| author_facet | Cheng Li Yu Zhong Carlos Andres Melo Luna Thomas Unger Konstantin Deichsel Anna Gräser Jürgen Köhler Anna Köhler Richard Hildner Sven Huettner |
| author_sort | Cheng Li |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-23T11:58:19Z |
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| language | English |
| last_indexed | 2024-12-23T11:58:19Z |
| publishDate | 2016-08-01 |
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| spelling | doaj.art-dd8591e2395841a3838246e6b573ee3b2022-12-21T17:48:02ZengMDPI AGMolecules1420-30492016-08-01218108110.3390/molecules21081081molecules21081081Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite FilmsCheng Li0Yu Zhong1Carlos Andres Melo Luna2Thomas Unger3Konstantin Deichsel4Anna Gräser5Jürgen Köhler6Anna Köhler7Richard Hildner8Sven Huettner9Organic and Hybrid Electronics, Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyOrganic and Hybrid Electronics, Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyExperimental Physics IV and Bayreuth Institute of Macromolecular Research, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyExperimental Physics II, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyExperimental Physics IV and Bayreuth Institute of Macromolecular Research, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyOrganic and Hybrid Electronics, Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyExperimental Physics IV and Bayreuth Institute of Macromolecular Research, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyExperimental Physics II, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyExperimental Physics IV and Bayreuth Institute of Macromolecular Research, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyOrganic and Hybrid Electronics, Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, Bayreuth 95447, GermanyInorganic-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.http://www.mdpi.com/1420-3049/21/8/1081perovskite solar cellsphotoluminescenceintermittencyAuger recombinationion migrationpassivationblinkingMethylammonium Lead Halidemethylammonium lead iodide |
| spellingShingle | Cheng Li Yu Zhong Carlos Andres Melo Luna Thomas Unger Konstantin Deichsel Anna Gräser Jürgen Köhler Anna Köhler Richard Hildner Sven Huettner Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films Molecules perovskite solar cells photoluminescence intermittency Auger recombination ion migration passivation blinking Methylammonium Lead Halide methylammonium lead iodide |
| title | Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films |
| title_full | Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films |
| title_fullStr | Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films |
| title_full_unstemmed | Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films |
| title_short | Emission Enhancement and Intermittency in Polycrystalline Organolead Halide Perovskite Films |
| title_sort | emission enhancement and intermittency in polycrystalline organolead halide perovskite films |
| topic | perovskite solar cells photoluminescence intermittency Auger recombination ion migration passivation blinking Methylammonium Lead Halide methylammonium lead iodide |
| url | http://www.mdpi.com/1420-3049/21/8/1081 |
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