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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Seidel, Jan
in Cooperation with on an Cooperation-Score of 37%
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Publications (8/8 displayed)
- 2024Microscopic and nanoscale mechanical properties of tonkin cane bamboo measured by advanced AFM methodscitations
- 2022"oxygen Sponge" Dynamics in Topotactic SrCo1- xFexO3-δcitations
- 2022Correction to Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites
- 2021Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskitescitations
- 2020Interfacial Responsive Functional Oxides for Nanoelectronicscitations
- 2020Unveiling the relationship between the perovskite precursor solution and the resulting device performancecitations
- 2018Enhanced piezoelectricity of thin film hafnia-zirconia (HZO) by inorganic flexible substratescitations
- 2016Direct evidence for the spin cycloid in strained nanoscale bismuth ferrite thin filmscitations
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article
Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites
Abstract
<p>The optoelectronic performance of organic-inorganic halide perovskite (OIHP)-based devices has been improved in recent years. Particularly, solar cells fabricated using mixed-cations and mixed-halides have outperformed their single-cation and single-halide counterparts. Yet, a systematic evaluation of the microstructural behavior of mixed perovskites is missing despite their known composition-dependent photoinstability. Here, we explore microstructural inhomogeneity in (FAPbI3)x(MAPbBr3)1-x using advanced scanning probe microscopy techniques. Contact potential difference (CPD) maps measured by Kelvin probe force microscopy show an increased fraction of grains exhibiting a low CPD with flat topography as MAPbBr3 concentration is increased. The higher portion of low CPD contributes to asymmetric CPD distribution curves. Chemical analysis reveals these grains being rich in MA, Pb, and I. The composition-dependent phase segregation upon illumination, reflected on the emergence of a low-energy peak emission in the original photoluminescence spectra, arises from the formation of such grains with flat topology. Bias-dependent piezo-response force microscopy measurements, in these grains, further confirm vigorous ion migration and cause a hysteretic piezo-response. Our results, therefore, provide insights into the microstructural evaluation of phase segregation and ion migration in OIHPs pointing toward process optimization as a mean to further enhance their optoelectronic performance. </p>