Perovskites are a class of crystal structure composed of three primary parts:
- A site large cation
- B site small cation
- X/O Anion
The composition of these components affects the properties of the perovskite
These include:
- Tunable band-gaps
- Tunable stability
2D Perovskites:
Benefits: Tunable bandgap by using organic spacer layering Protection from elements
Drawbacks: hard to synthisize Lower absorbtion coefficients
Common Perovskite components and rationale:
FA: Reduces bandgap, improves thermal stability MA: Better crystalization and film formation Cs: Reduces defects, stabilizes phase Pb: Forms strong bonds with halides, good band structure fr charge carrier transport. Longer carrier diffusion lengths I: Narrower bandgap Br: Wider bandgap