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Updated: Oct 13, 2025
04:14
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
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Ferroelectricity-free lead halide perovskites.
Andrés Gómez1, Qiong Wang2, Alejandro R Goñi1,3
1Instituto de Ciencia de Materiales de Barcelona (ICMAB-CSIC), Campus UAB 08193 Bellaterra Spain agomez@icmab.es andres.gomez.rodríguez@csic.es.
Energy & Environmental Science
|November 15, 2021
Summary
Direct piezoelectric force microscopy (DPFM) reveals that lead halide perovskites, including Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 and MAPbI3, are not ferroelectric. Observed signals likely stem from ion migration, resolving a debate on their physical properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid-State Chemistry
Background:
- Lead halide perovskites are crucial for optoelectronics and photovoltaics.
- Their ferroelectric properties remain debated, impacting device stability and performance.
- Existing techniques have not definitively resolved the ferroelectricity question.
Purpose of the Study:
- To definitively determine if lead halide perovskites exhibit ferroelectricity.
- To investigate the origin of observed current signals in these materials.
- To resolve longstanding disputes regarding the fundamental physical properties of perovskites.
Main Methods:
- Direct piezoelectric force microscopy (DPFM) was employed to directly measure piezoelectricity.
- DPFM was used to detect current signals generated by atomic force microscope (AFM) tip interactions.
- Comparative studies included well-known ferroelectrics (LiNbO3, PZT) and perovskite films (Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3, MAPbI3) under varying conditions.
Main Results:
- DPFM measurements demonstrated that the studied lead halide perovskite films are ferroelectricity-free.
- No ferroelectric domains were detected in Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 and MAPbI3 films.
- Observed current profiles are attributed to ion migration under electrical bias and mechanical stress.
Conclusions:
- Lead halide perovskites, specifically Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 and MAPbI3, do not exhibit ferroelectricity.
- The findings resolve a significant debate concerning the non-ferroelectric nature of these materials.
- This clarification is vital for advancing optoelectronic and photovoltaic applications.
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