Dynamic control of halide perovskite structures for tailored ferroelectric and second-order nonlinear optical...

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Metal halide perovskites (MHPs) exhibit unique optoelectronic properties, ferroelectricity, and nonlinear optical responses.
• MHPs possess diverse structural architectures (3D, 2D, 1D) enabling tailored property design, distinct from classic oxide perovskites.

Purpose of the Study:

• To review the structural diversity of halide perovskites.
• To highlight structure-property relationships governing ferroelectric and nonlinear optical behaviors.
• To discuss design strategies and device applications of MHPs.

Main Methods:

• Reviewing fundamental mechanisms of ferroelectricity in MHPs (displacive distortions, lone-pair stereoactivity, cation ordering).
• Analyzing structure-property relationships through A-site and B-site engineering, dimensionality tuning, and external stimuli.
• Examining design strategies like asymmetric coordination, excitonic channels, and resonance effects for enhanced nonlinear optical responses.

Main Results:

• MHPs show significant structural diversity crucial for ferroelectric and nonlinear optical properties.
• Precise engineering of MHPs enables control over ferroelectricity and second-harmonic generation (SHG) responses.
• Key design strategies effectively enhance SHG and polarization switching.

Conclusions:

• MHPs are promising for ferroelectric photovoltaics, photodetectors, and multipurpose optoelectronics.
• Addressing stability and scalability is crucial for commercializing MHP ferroelectrics.
• Future research should focus on overcoming these challenges to unlock MHP potential.