Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiation
3D mixed perovskites have achieved substantial success in boosting solar cell efficiency, but the complicated perovskite crystal formation pathway remains mysterious. Here we present detailed crystallization kinetics of mixed perovskites FA0.83MA0.17Pb(I0.83Br0.17)3, where FA is formamidinium and MA...
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International Union of Crystallography
2025-01-01
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| Series: | Journal of Synchrotron Radiation |
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| Online Access: | https://journals.iucr.org/paper?S1600577524010695 |
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| author | Miller Shatsala Stellah Wanyonyi Celline Awino Maxwell Mageto Hussein Golicha |
| author_facet | Miller Shatsala Stellah Wanyonyi Celline Awino Maxwell Mageto Hussein Golicha |
| author_sort | Miller Shatsala |
| collection | DOAJ |
| description | 3D mixed perovskites have achieved substantial success in boosting solar cell efficiency, but the complicated perovskite crystal formation pathway remains mysterious. Here we present detailed crystallization kinetics of mixed perovskites FA0.83MA0.17Pb(I0.83Br0.17)3, where FA is formamidinium and MA is methylammonium, with the addition of Cs+ to form a triple cation perovskite (3-CAT), in a comparison with the perovskite building block MAPbI3 (MAPI) via static grazing-incidence wide-angle X-ray scattering (GIWAXS) and micro-diffraction measurements. Spin-coated films produced α-perovskite peaks with no PbI2 or δ-intermediate phases, which was a promising result for the 3-CAT perovskite from micro-diffraction measurements. However, the 3-CAT did not remain stable on probing with varied relative humidity (RH) conditions as segregation back to the δ-intermediate and PbI2 phase after 10 s of exposure to an RH value of 11% was found to occur from the GIWAXS results. When RH levels were elevated to over 100%, segregation peaks of PbI2 and δ-intermediate (2H, 4H and 6H) became conspicuous as the α-phase intensity diminished, unlike for MAPI that remains relatively stable. The possible cause of this is hydrophilic bonds that form between the 3-CAT crystals and the small annealing window of the best composition perovskite (5% Cs+) film. |
| format | Article |
| id | doaj-art-cfc048d00f3e41c1ac6ba41be0752243 |
| institution | Kabale University |
| issn | 1600-5775 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | International Union of Crystallography |
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| series | Journal of Synchrotron Radiation |
| spelling | doaj-art-cfc048d00f3e41c1ac6ba41be07522432025-01-07T14:26:38ZengInternational Union of CrystallographyJournal of Synchrotron Radiation1600-57752025-01-0132114515410.1107/S1600577524010695ju5071Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiationMiller Shatsala0Stellah Wanyonyi1Celline Awino2Maxwell Mageto3Hussein Golicha4Department of Physics, Masinde Muliro University of Science and Technology, Kakamega, KenyaDepartment of Pure and Applied Chemistry, Masinde Muliro University of Science and Technology, Kakamega, KenyaDepartment of Physics, Masinde Muliro University of Science and Technology, Kakamega, KenyaDepartment of Physics, Masinde Muliro University of Science and Technology, Kakamega, KenyaDepartment of Physics, Masinde Muliro University of Science and Technology, Kakamega, Kenya3D mixed perovskites have achieved substantial success in boosting solar cell efficiency, but the complicated perovskite crystal formation pathway remains mysterious. Here we present detailed crystallization kinetics of mixed perovskites FA0.83MA0.17Pb(I0.83Br0.17)3, where FA is formamidinium and MA is methylammonium, with the addition of Cs+ to form a triple cation perovskite (3-CAT), in a comparison with the perovskite building block MAPbI3 (MAPI) via static grazing-incidence wide-angle X-ray scattering (GIWAXS) and micro-diffraction measurements. Spin-coated films produced α-perovskite peaks with no PbI2 or δ-intermediate phases, which was a promising result for the 3-CAT perovskite from micro-diffraction measurements. However, the 3-CAT did not remain stable on probing with varied relative humidity (RH) conditions as segregation back to the δ-intermediate and PbI2 phase after 10 s of exposure to an RH value of 11% was found to occur from the GIWAXS results. When RH levels were elevated to over 100%, segregation peaks of PbI2 and δ-intermediate (2H, 4H and 6H) became conspicuous as the α-phase intensity diminished, unlike for MAPI that remains relatively stable. The possible cause of this is hydrophilic bonds that form between the 3-CAT crystals and the small annealing window of the best composition perovskite (5% Cs+) film.https://journals.iucr.org/paper?S16005775240106953d perovskitecrystallizationphase segregationgwaxsmicro-diffraction |
| spellingShingle | Miller Shatsala Stellah Wanyonyi Celline Awino Maxwell Mageto Hussein Golicha Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiation Journal of Synchrotron Radiation 3d perovskite crystallization phase segregation gwaxs micro-diffraction |
| title | Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiation |
| title_full | Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiation |
| title_fullStr | Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiation |
| title_full_unstemmed | Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiation |
| title_short | Comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron X-ray based radiation |
| title_sort | comparative study of crystallization kinetics and phase segregation of triple cation and methylammonium lead iodide perovskites on moisture probing using synchrotron x ray based radiation |
| topic | 3d perovskite crystallization phase segregation gwaxs micro-diffraction |
| url | https://journals.iucr.org/paper?S1600577524010695 |
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