A Potential Sn-Based Hybrid Perovskite Ferroelectric Semiconductor.

Area of Science:

• Materials Science
• Solid-State Physics
• Chemistry

Background:

• Ferroelectric semiconductors offer unique properties for advanced electronic devices.
• Organic-inorganic lead halide perovskites show promise but contain toxic lead.
• Developing lead-free alternatives is crucial for sustainable applications.

Purpose of the Study:

• To synthesize and characterize a novel lead-free hybrid perovskite semiconductor.
• To investigate its ferroelectric properties and potential for energy applications.
• To understand the mechanism behind its ferroelectricity.

Main Methods:

• Synthesis of the lead-free hybrid perovskite semiconductor (C4H9NH3)2(NH3CH3)2Sn3Br10.
• Measurement of spontaneous polarization and ferroelectric phase transition behaviors.
• Mechanistic studies involving organic cation ordering and inorganic octahedra distortion.

Main Results:

• The synthesized material exhibits a large spontaneous polarization (11.76 μC cm⁻²).
• It displays spontaneous polar ordering and ferroelectric phase transition behaviors.
• This is the first reported Sn-based hybrid perovskite semiconductor with ferroelectric properties.

Conclusions:

• The novel lead-free perovskite semiconductor offers a sustainable alternative to lead-based materials.
• Ferroelectricity arises from synergistic effects of organic cations and lone-pair electrons.
• This work opens avenues for green ferroelectric semiconductors with enhanced energy conversion efficiency.