Halide Perovskites in Optoelectronics

Content

Fundamentals

• Crystal structure: Goldschmidt tolerance factor, chemical substitution, impact of tilting and rotation; crystallography
• Electronic structure: band gaps, band dispersion, orbital overlap; approaches for calculation, impact of spin-orbit coupling
• Neat lead and tin-based systems: benefits & drawback; auto-doping, oxidation, toxicity
• Mixed systems: Band-gap bowing, photodoping, phase segregation
• Morphology, texture, and surfaces; electron & x-ray microscopy/spectroscopy/diffraction
• Photophysics: Excitons and carrier dynamics, analysis techniques
• Electrical transport; polarons and ionic effects
• Perovskite Nanocrystals: colloidal synthesis, surface chemistry
• Electronically low-dimensional perovskites: interaction of spacers and octahedra; chiral systems
• Perovskite-inspired systems: Double-perovskites, Anti-perovskites

Devices and Applications

• Perovskite solar cells: PbI-based single junction cells, architectures, optimisation; all-perovskite tandem cells; tandems with silicon or CdTe
• Industrialisation & reliability testing
• LEDs: red, green, blue, and white systems, degradation, approaches; switching speeds
• Photodetectors, broadband vs narrowband
• High energy radiation detectors: X-ray, gamma-, and beta-radiation
• Optical communication systems

Aims

Students understand the fundamental properties of halogen perovskites and are familiar with their synthesis. The students understand how physical parameters are analysed and are aware of the benefits of halogen perovskites for a broad field or opto-electronic applications. In the Seminar, the students learn the critical interaction with the literature as well as the working mechanisms of relevant experimental techniques.

Requirements

Participants should be familiar with the fundamentals of semiconductor physics and should possess a general understanding of solar cells and light-emitting diodes