Grain Size Influences Activation Energy and Migration Pathways in MAPbBr3 Perovskite Solar Cells
| Autor: | Bruno Ehrler, Gianluca Grimaldi, Loreta A. Muscarella, Lucie McGovern, Isabel Koschany |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Band gap Ion migration food and beverages 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Grain size 0104 chemical sciences chemistry.chemical_compound chemistry Chemical physics Bromide General Materials Science Grain boundary Physical and Theoretical Chemistry 0210 nano-technology Perovskite (structure) |
| Zdroj: | The journal of physical chemistry letters, 12(9), 2423. American Chemical Society : Division of Carbohydrate Chemistry |
| ISSN: | 1948-7185 |
| Popis: | Ion migration in perovskite layers can significantly reduce the long-term stability of the devices. While perovskite composition engineering has proven an interesting tool to mitigate ion migration, many optoelectronic devices require a specific bandgap and thus require a specific perovskite composition. Here, we look at the effect of grain size to mitigate ion migration. We find that in MAPbBr3 solar cells prepared with grain sizes varying from 2 to 11 μm the activation energy for bromide ion migration increases from 0.17 to 0.28 eV. Moreover, we observe the appearance of a second bromide ion migration pathway for the devices with largest grain size, which we attribute to ion migration mediated by the bulk of the perovskite, as opposed to ion migration mediated by the grain boundaries. Together, these results suggest the beneficial nature of grain engineering for reduction of ion migration in perovskite solar cells. |
| Databáze: | OpenAIRE |
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