Dear Colleagues,

Perovskites are one of the best-known compounds. Research on them has been going on for almost two hundred years. Lew Perovski (1792 - 1852) is a Russian mineralogist whose study of the crystal structure of calcium titanium oxide (CaTiO₃) gave the name to the class of compounds with the same crystal structure (ABX₃), known as the perovskite structure. We are currently seeing a great resurgence in the study of perovskites, both for cognitive and application reasons. LiNbO₃ is frequently investigated owing to its good electrooptic and acousto-optic properties. Similarly, the same as LiNbO₃, LiTaO₃ can also be widely used as a surface acoustic wave substrate, electro-optic modulator and second harmonic generation material. The power of perovskites lies in their structure. Conventional oxide perovskites are cubic. Hexagonal oxide perovskites, e.g., SrIrO₃, are especially relevant due to their significance as quantum materials.

A new and great example of the significant applications of perovskites is their ability to convert solar energy into electricity. Perovskite solar sells could be the future of this kind energy. They are cheap cost, highly efficient, thin, lightweight and flexible since they can be printed by inks, and an interesting alternative to traditional silicon solar panels. They can be used as a thin film laid on glass or plastic. Perovskite solar cells convert sunlight into electricity around 50 % more efficiently than silicon cells. Ink jet printing and roll-to-roll methods can be used to produce the solar cells. Perovskites have reached about 30 % efficiency in lab tests. A perovskite–silicon combination might even achieve a 45 % efficiency, more than double that of today’s silicon panels.

The subject of this Special Issue is perovskites, presenting results from the latest research on their structural, physical, optical, magnetic, and other properties, as well as computer simulation and theoretical studies. It also covers perovskites as crystals, powders, and thin films, pure and doped. The properties of perovskites are the key to their future applications.

Prof. Dr. Tomasz Bodziony
Prof. Dr. SŁawomir Kaczmarek
Guest Editors

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• perovskites
• nanomaterials
• optical materials
• quantum materials
• lasers
• waveguides
• electro-optic modulators
• solar cells
• energy converters.