Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface Modification
Abstract Interfacial space charges significantly influence transport and recombination of charge carriers in optoelectronic devices. Due to the mixed ionic‐electronic conducting properties of halide perovskites, not only electronic effects, but also ionic interactions at their interfaces need to be...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2024-04-01
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| Series: | Advanced Materials Interfaces |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/admi.202300874 |
| _version_ | 1797208399336701952 |
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| author | Mina Jung Masaud Almalki Michael Graetzel Davide Moia Joachim Maier |
| author_facet | Mina Jung Masaud Almalki Michael Graetzel Davide Moia Joachim Maier |
| author_sort | Mina Jung |
| collection | DOAJ |
| description | Abstract Interfacial space charges significantly influence transport and recombination of charge carriers in optoelectronic devices. Due to the mixed ionic‐electronic conducting properties of halide perovskites, not only electronic effects, but also ionic interactions at their interfaces need to be considered in the analysis of space charges. Understanding of these interactions and their control is currently missing. This study elucidates the ionic effects on space charge formation at the interface between methylammonium lead iodide (MAPI) and alumina, and its modulation through surface modification using organic molecules. Embedding insulating alumina nanoparticles within MAPI films leads to enhancement of the electronic conductivity. This effect is consistent with the formation of an interfacial inversion layer in MAPI and can only be explained on the basis of ionic interactions. Such an effect is attenuated by surface modification of the oxide via the chemisorption of organic molecules. Finally, the same trend is observed in solar cells, where reducing the potential of the distributed space charges within the composite active layer improves device performance. These findings emphasize the necessity of taking into account ionic interactions to control the space charge formation at interfaces involving mixed ionic‐electronic conductors, an essential aspect in the performance optimization of halide perovskite‐based devices. |
| first_indexed | 2024-04-24T09:38:11Z |
| format | Article |
| id | doaj.art-f706ec4c7ea34d229f3fb4de57afdc13 |
| institution | Directory Open Access Journal |
| issn | 2196-7350 |
| language | English |
| last_indexed | 2024-04-24T09:38:11Z |
| publishDate | 2024-04-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Materials Interfaces |
| spelling | doaj.art-f706ec4c7ea34d229f3fb4de57afdc132024-04-15T08:10:07ZengWiley-VCHAdvanced Materials Interfaces2196-73502024-04-011111n/an/a10.1002/admi.202300874Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface ModificationMina Jung0Masaud Almalki1Michael Graetzel2Davide Moia3Joachim Maier4Max Planck Institute for Solid State ResearchHeisenbergstrasse 1 70569 Stuttgart GermanyLaboratory of Photonics and Interfaces Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 SwitzerlandLaboratory of Photonics and Interfaces Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 SwitzerlandMax Planck Institute for Solid State ResearchHeisenbergstrasse 1 70569 Stuttgart GermanyMax Planck Institute for Solid State ResearchHeisenbergstrasse 1 70569 Stuttgart GermanyAbstract Interfacial space charges significantly influence transport and recombination of charge carriers in optoelectronic devices. Due to the mixed ionic‐electronic conducting properties of halide perovskites, not only electronic effects, but also ionic interactions at their interfaces need to be considered in the analysis of space charges. Understanding of these interactions and their control is currently missing. This study elucidates the ionic effects on space charge formation at the interface between methylammonium lead iodide (MAPI) and alumina, and its modulation through surface modification using organic molecules. Embedding insulating alumina nanoparticles within MAPI films leads to enhancement of the electronic conductivity. This effect is consistent with the formation of an interfacial inversion layer in MAPI and can only be explained on the basis of ionic interactions. Such an effect is attenuated by surface modification of the oxide via the chemisorption of organic molecules. Finally, the same trend is observed in solar cells, where reducing the potential of the distributed space charges within the composite active layer improves device performance. These findings emphasize the necessity of taking into account ionic interactions to control the space charge formation at interfaces involving mixed ionic‐electronic conductors, an essential aspect in the performance optimization of halide perovskite‐based devices.https://doi.org/10.1002/admi.202300874halide perovskitesinterfacesmixed ionic‐electronic conductorsmobile ionssolid state ionicsspace charge effects |
| spellingShingle | Mina Jung Masaud Almalki Michael Graetzel Davide Moia Joachim Maier Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface Modification Advanced Materials Interfaces halide perovskites interfaces mixed ionic‐electronic conductors mobile ions solid state ionics space charge effects |
| title | Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface Modification |
| title_full | Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface Modification |
| title_fullStr | Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface Modification |
| title_full_unstemmed | Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface Modification |
| title_short | Modulation of Ionically Generated Space Charge Effects at Hybrid Perovskite and Oxide Interfaces via Surface Modification |
| title_sort | modulation of ionically generated space charge effects at hybrid perovskite and oxide interfaces via surface modification |
| topic | halide perovskites interfaces mixed ionic‐electronic conductors mobile ions solid state ionics space charge effects |
| url | https://doi.org/10.1002/admi.202300874 |
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