Fapbi3 Cif File

primarily exists in two major polymorphs at room temperature: the photoactive (black) and the non-perovskite -phase (yellow).

You convert the CIF into a POSCAR or .in file. The cubic cell allows for fast k-point sampling. However, note that DFT often requires relaxing the structure (especially the H atoms of FA, which are missing in basic CIFs).

The is the one of interest for photovoltaic applications. Its cubic structure (space group Pm-3m ) consists of PbI₆ octahedra sharing corners, with FA⁺ cations occupying the cuboctahedral voids.

You can download verified CIF data from these primary databases: Short Guide to CIFs - CCDC fapbi3 cif file

) due to its narrower bandgap (~1.48 eV), which is closer to the ideal Shockley-Queisser limit. However, FAPbI3FAPbI sub 3

: Contains experimental CIFs derived from published X-ray diffraction (XRD) studies.

-phase , prized for its narrow optical bandgap of approximately which is ideally aligned to the AM1.5G solar spectrum. FAPbI3.cif - WMD-group/hybrid-perovskites - GitHub primarily exists in two major polymorphs at room

) occupy the large empty spaces (cuboctahedral voids) within this cage.

A CIF file is a standard text file format used to store crystallographic information. The FAPbI3FAPbI sub 3

(Visualization for Electronic and Structural Analysis) Mercury (CCDC) XCrySDen 2. Simulating XRD Patterns However, note that DFT often requires relaxing the

Silence.

) cations occupying the 12-fold coordinated cuboctahedral cavities. -Phase (Hexagonal): At room temperature, the -phase is metastable and often transitions into the yellow

structure at room temperature. Note that in refined CIFs, the organic cap F cap A raised to the positive power cation (Formamidinium) is often modeled as disordered due to its rapid rotation within the lead-iodide cage. Site Occupancy Source: Adapted from GitHub - WMD-group/hybrid-perovskites 3. Stability Considerations is the goal for performance, cap F cap A cap P b cap I sub 3

Rendering the crystal structure in tools like VESTA or Mercury.

): This is the black, photoactive perovskite phase. It features a cubic structure (space group Pm3m ) at high temperatures. It can change to a tetragonal or orthorhombic structure as it cools down. Delta Phase ( FAPbI3FAPbI sub 3