Photovoltaics with Ferroelectrics: Current Status and Beyond.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Optoelectronics

Background:

• Ferroelectric materials possess switchable spontaneous electric polarization, often coupled to strain (piezoelectricity) or magnetism (multiferroics).
• Recent research (since 2009) highlights the coupling of ferroelectric polarization with optical properties, particularly in low-bandgap materials for solar energy applications.
• This has led to the emergence of photoferroelectrics as a promising class of photovoltaic materials.

Purpose of the Study:

• To provide an up-to-date review of the rapidly advancing field of photoferroelectrics.
• To highlight key parameters influencing photovoltaic performance, including domain walls, bandgap tuning, polarization switchability, defects, and electrode effects.
• To explore other polarization-related phenomena like photostriction and light-assisted chemical reactions.

Main Methods:

• Review of recent literature on ferroelectric materials and their optical properties.
• Analysis of factors affecting power conversion efficiency in photoferroelectric devices.
• Discussion of emerging applications beyond photovoltaics.

Main Results:

• Photoferroelectrics demonstrate significant potential for solar energy conversion, with achieved efficiencies of 8.1% and predicted efficiencies of 19.5%.
• The review identifies critical factors like domain walls, bandgap engineering, polarization dynamics, defects, and electrode interfaces that govern performance.
• Other light-induced phenomena such as photostriction are also discussed.

Conclusions:

• Photoferroelectrics represent a promising avenue for next-generation photovoltaic technologies.
• Further research into optimizing material properties and device architectures is crucial for realizing their full potential.
• The findings may inspire research in related fields, such as hybrid halide perovskites.