Thermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskites
Abstract The promise of hybrid organic–inorganic halide perovskite solar cells rests on their exceptional power conversion efficiency routinely exceeding 25% in laboratory scale devices. While the migration of halide ions in perovskite thin films has been extensively investigated, the understanding...
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| Format: | Article |
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Nature Portfolio
2022-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-14452-y |
| _version_ | 1811242226026545152 |
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| author | Daniele T. Cuzzupè Feray Ünlü Khan Lê Robin Bernhardt Michael Wilhelm Matthias Grosch Rene Weißing Thomas Fischer Paul H. M. van Loosdrecht Sanjay Mathur |
| author_facet | Daniele T. Cuzzupè Feray Ünlü Khan Lê Robin Bernhardt Michael Wilhelm Matthias Grosch Rene Weißing Thomas Fischer Paul H. M. van Loosdrecht Sanjay Mathur |
| author_sort | Daniele T. Cuzzupè |
| collection | DOAJ |
| description | Abstract The promise of hybrid organic–inorganic halide perovskite solar cells rests on their exceptional power conversion efficiency routinely exceeding 25% in laboratory scale devices. While the migration of halide ions in perovskite thin films has been extensively investigated, the understanding of cation diffusion remains elusive. In this study, a thermal migration of A‑site cations at the solid–solid interface, formed by two physically paired MAPbI3 and FAPbI3 perovskite thin films casted on FTO, is demonstrated through continuous annealing at comparably low temperature (100 °C). Diffusion of methylammonium (CH3NH3 +, MA+) cations into the low‑symmetry yellow δ‑FAPbI3 phase triggers a transition from the yellow (δ) to black (α) phase evident in the distinctive color change and verified by shifts in absorption bands and X‑ray diffraction patterns. Intermixing of the A‑site cations MA+ and FA+ (CH(NH2)2 +) occurred for both systems, α‑MAPbI3/δ‑FAPbI3 and α‑MAPbI3/α‑FAPbI3. The structural and compositional changes in both cases support a thermally activated ion drift unambiguously demonstrated through changes in the absorption and X-ray photoelectron spectra. Moreover, the physical contact annealing (PCA) leads to healing of defects and pinholes in α‑MAPbI3 thin films, which was correlated to longer recombination lifetimes in mixed MAxFA1−xPbI3 thin films obtained after PCA and probed by ultrafast transient absorption spectroscopy. |
| first_indexed | 2024-04-12T13:47:35Z |
| format | Article |
| id | doaj.art-8e6c0ac793b74404ad0ba06fbf60d211 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-12T13:47:35Z |
| publishDate | 2022-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-8e6c0ac793b74404ad0ba06fbf60d2112022-12-22T03:30:37ZengNature PortfolioScientific Reports2045-23222022-06-0112111110.1038/s41598-022-14452-yThermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskitesDaniele T. Cuzzupè0Feray Ünlü1Khan Lê2Robin Bernhardt3Michael Wilhelm4Matthias Grosch5Rene Weißing6Thomas Fischer7Paul H. M. van Loosdrecht8Sanjay Mathur9Chemistry Department, Institute of Inorganic Chemistry, University of CologneChemistry Department, Institute of Inorganic Chemistry, University of CologneChemistry Department, Institute of Inorganic Chemistry, University of CologneInstitute of Physics 2, University of CologneChemistry Department, Institute of Inorganic Chemistry, University of CologneChemistry Department, Institute of Inorganic Chemistry, University of CologneChemistry Department, Institute of Inorganic Chemistry, University of CologneChemistry Department, Institute of Inorganic Chemistry, University of CologneInstitute of Physics 2, University of CologneChemistry Department, Institute of Inorganic Chemistry, University of CologneAbstract The promise of hybrid organic–inorganic halide perovskite solar cells rests on their exceptional power conversion efficiency routinely exceeding 25% in laboratory scale devices. While the migration of halide ions in perovskite thin films has been extensively investigated, the understanding of cation diffusion remains elusive. In this study, a thermal migration of A‑site cations at the solid–solid interface, formed by two physically paired MAPbI3 and FAPbI3 perovskite thin films casted on FTO, is demonstrated through continuous annealing at comparably low temperature (100 °C). Diffusion of methylammonium (CH3NH3 +, MA+) cations into the low‑symmetry yellow δ‑FAPbI3 phase triggers a transition from the yellow (δ) to black (α) phase evident in the distinctive color change and verified by shifts in absorption bands and X‑ray diffraction patterns. Intermixing of the A‑site cations MA+ and FA+ (CH(NH2)2 +) occurred for both systems, α‑MAPbI3/δ‑FAPbI3 and α‑MAPbI3/α‑FAPbI3. The structural and compositional changes in both cases support a thermally activated ion drift unambiguously demonstrated through changes in the absorption and X-ray photoelectron spectra. Moreover, the physical contact annealing (PCA) leads to healing of defects and pinholes in α‑MAPbI3 thin films, which was correlated to longer recombination lifetimes in mixed MAxFA1−xPbI3 thin films obtained after PCA and probed by ultrafast transient absorption spectroscopy.https://doi.org/10.1038/s41598-022-14452-y |
| spellingShingle | Daniele T. Cuzzupè Feray Ünlü Khan Lê Robin Bernhardt Michael Wilhelm Matthias Grosch Rene Weißing Thomas Fischer Paul H. M. van Loosdrecht Sanjay Mathur Thermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskites Scientific Reports |
| title | Thermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskites |
| title_full | Thermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskites |
| title_fullStr | Thermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskites |
| title_full_unstemmed | Thermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskites |
| title_short | Thermally-induced drift of A-site cations at solid–solid interface in physically paired lead halide perovskites |
| title_sort | thermally induced drift of a site cations at solid solid interface in physically paired lead halide perovskites |
| url | https://doi.org/10.1038/s41598-022-14452-y |
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