Perovskite hetero-anionic-sublattice interfaces for optoelectronics and nonconventional electronics

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• Perovskite structures are versatile for functional materials and interfaces.
• Perovskite halides (PH) are key for optoelectronics, while perovskite oxides (POs) are used in energy and electronics.
• Interfacing different perovskite types, particularly with anionic freedom, opens new avenues for emergent phenomena.

Purpose of the Study:

• To investigate interfaces between perovskite halides (CsPbBr3, Cs2TiBr6) and perovskite oxides.
• To explore the potential of these hetero-anionic-sublattice interfaces for optoelectronic and nonconventional electronic applications.
• To assess the suitability of POs as carrier transport materials (CTMs) for PHs.

Main Methods:

• Band alignment analysis to determine carrier transport suitability.
• Investigation of crystal lattice compatibility to assess interface quality.
• Theoretical prediction of electronic properties at asymmetric interfaces.

Main Results:

• Perovskite oxides are identified as suitable CTMs for CsPbBr3 and Cs2TiBr6 based on band alignment.
• Perovskite hetero-anionic-sublattice interfaces are found to be defect- and dangling bond-free.
• Two-dimensional electron-hole systems are predicted at asymmetric interfaces (e.g., Cs2TiBr6:LaAlO3, CsPbBr3:LaAlO3).

Conclusions:

• Perovskite hetero-anionic-sublattice interfaces offer a promising new platform for advanced materials.
• These interfaces can potentially outperform conventional CTMs in optoelectronic devices.
• The predicted electron-hole systems at interfaces suggest novel applications in light-electron interactions.