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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Spatially Resolved Observation of Ferroelectric-to-Paraelectric Phase Transition in a Two-Dimensional Halide
Tae Hyun Jung1, Yunseung Kuk2, June Hee Shin1
1Department of Physics, Sogang University, Seoul, 04107, Republic of Korea.
Advanced Materials (Deerfield Beach, Fla.)
|June 1, 2025
Summary
This study reveals how ferroelectric domains in 2D halide perovskites change with temperature. The research shows phase transitions begin locally below the Curie temperature, impacting material properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- 2D halide perovskites are promising for applications but their temperature-dependent ferroelectric behavior is not well understood.
- Nanoscale ferroelectric domain evolution and phase transitions are critical for device performance.
Purpose of the Study:
- To investigate nanoscale ferroelectric domain evolution with temperature in (BA)2(MA)Pb2Br7 films.
- To understand the ferroelectric-to-paraelectric phase transition dynamics at the nanoscale.
Main Methods:
- Piezoresponse Force Microscopy (PFM) was employed to study ferroelectric domain structures.
- Angle-resolved lateral PFM (LPFM) and temperature-dependent spectroscopy were used for detailed analysis.
Main Results:
- A complex in-plane ferroelectric domain structure was observed.
- The Curie temperature (TC) was determined to be approximately 353 K.
- Local phase transitions were observed below TC, with domain fragmentation and weakening ferroelectricity as temperature increased.
Conclusions:
- The study identified a second-order phase transition consistent with Landau-Ginzburg-Devonshire theory.
- Spatially resolved observations provide critical insights into temperature-dependent ferroelectric properties of 2D halide perovskites.
- Findings establish a framework for future device applications of these materials.
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