Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized Excitons
Over the past decade, interest about metal halide perovskites has rapidly increased, as they can find wide application in optoelectronic devices. Nevertheless, although thermal evaporation is crucial for the development and engineering of such devices based on multilayer structures, the optical prop...
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| Format: | Article |
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MDPI AG
2022-01-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/2/211 |
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| author | Claudia Triolo Maria Luisa De Giorgi Antonella Lorusso Arianna Cretì Saveria Santangelo Mauro Lomascolo Marco Anni Marco Mazzeo Salvatore Patané |
| author_facet | Claudia Triolo Maria Luisa De Giorgi Antonella Lorusso Arianna Cretì Saveria Santangelo Mauro Lomascolo Marco Anni Marco Mazzeo Salvatore Patané |
| author_sort | Claudia Triolo |
| collection | DOAJ |
| description | Over the past decade, interest about metal halide perovskites has rapidly increased, as they can find wide application in optoelectronic devices. Nevertheless, although thermal evaporation is crucial for the development and engineering of such devices based on multilayer structures, the optical properties of thermally deposited perovskite layers (spontaneous and amplified spontaneous emission) have been poorly investigated. This paper is a study from a nano- to micro- and macro-scale about the role of light-emitting species (namely free carriers and excitons) and trap states in the spontaneous emission of thermally evaporated thin layers of CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> perovskite after wet air UV light trap passivation. The map of light emission from grains, carried out by SNOM at the nanoscale and by micro-PL techniques, clearly indicates that free and localized excitons (EXs) are the dominant light-emitting species, the localized excitons being the dominant ones in the presence of crystallites. These species also have a key role in the amplified spontaneous emission (ASE) process: for higher excitation densities, the relative contribution of localized EXs basically remains constant, while a clear competition between ASE and free EXs spontaneous emission is present, which suggests that ASE is due to stimulated emission from the free EXs. |
| first_indexed | 2024-03-10T00:48:53Z |
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| id | doaj.art-4dcdb20ae1cc4b4d9d31cae10dfa0252 |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T00:48:53Z |
| publishDate | 2022-01-01 |
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| series | Nanomaterials |
| spelling | doaj.art-4dcdb20ae1cc4b4d9d31cae10dfa02522023-11-23T14:54:43ZengMDPI AGNanomaterials2079-49912022-01-0112221110.3390/nano12020211Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized ExcitonsClaudia Triolo0Maria Luisa De Giorgi1Antonella Lorusso2Arianna Cretì3Saveria Santangelo4Mauro Lomascolo5Marco Anni6Marco Mazzeo7Salvatore Patané8Department of Civil, Energy, Environmental and Materials Engineering (DICEAM), Mediterranean University, 89122 Reggio Calabria, ItalyDipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, 73100 Lecce, ItalyDipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, 73100 Lecce, ItalyIMM-CNR Institute for Microelectronic and Microsystems, Via per Monteroni, 73100 Lecce, ItalyDepartment of Civil, Energy, Environmental and Materials Engineering (DICEAM), Mediterranean University, 89122 Reggio Calabria, ItalyIMM-CNR Institute for Microelectronic and Microsystems, Via per Monteroni, 73100 Lecce, ItalyDipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, 73100 Lecce, ItalyDipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, 73100 Lecce, ItalyDepartment of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, 98166 Messina, ItalyOver the past decade, interest about metal halide perovskites has rapidly increased, as they can find wide application in optoelectronic devices. Nevertheless, although thermal evaporation is crucial for the development and engineering of such devices based on multilayer structures, the optical properties of thermally deposited perovskite layers (spontaneous and amplified spontaneous emission) have been poorly investigated. This paper is a study from a nano- to micro- and macro-scale about the role of light-emitting species (namely free carriers and excitons) and trap states in the spontaneous emission of thermally evaporated thin layers of CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> perovskite after wet air UV light trap passivation. The map of light emission from grains, carried out by SNOM at the nanoscale and by micro-PL techniques, clearly indicates that free and localized excitons (EXs) are the dominant light-emitting species, the localized excitons being the dominant ones in the presence of crystallites. These species also have a key role in the amplified spontaneous emission (ASE) process: for higher excitation densities, the relative contribution of localized EXs basically remains constant, while a clear competition between ASE and free EXs spontaneous emission is present, which suggests that ASE is due to stimulated emission from the free EXs.https://www.mdpi.com/2079-4991/12/2/211perovskitethermal evaporationtrap statesfree excitonslocalized excitonsPL emission |
| spellingShingle | Claudia Triolo Maria Luisa De Giorgi Antonella Lorusso Arianna Cretì Saveria Santangelo Mauro Lomascolo Marco Anni Marco Mazzeo Salvatore Patané Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized Excitons Nanomaterials perovskite thermal evaporation trap states free excitons localized excitons PL emission |
| title | Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized Excitons |
| title_full | Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized Excitons |
| title_fullStr | Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized Excitons |
| title_full_unstemmed | Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized Excitons |
| title_short | Light Emission Properties of Thermally Evaporated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Perovskite from Nano- to Macro-Scale: Role of Free and Localized Excitons |
| title_sort | light emission properties of thermally evaporated ch sub 3 sub nh sub 3 sub pbbr sub 3 sub perovskite from nano to macro scale role of free and localized excitons |
| topic | perovskite thermal evaporation trap states free excitons localized excitons PL emission |
| url | https://www.mdpi.com/2079-4991/12/2/211 |
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