Fapbi3 Cif - File

Conclusion: The search is almost certainly for Formamidinium Lead Iodide ($\alpha$-FAPbI$_3$), a star material in the field of photovoltaics.

In the rapidly evolving field of photovoltaics, Formamidinium Lead Iodide (FAPbI₃) has emerged as the frontrunner material for next-generation perovskite solar cells (PSCs). With a bandgap of approximately 1.48 eV and superior thermal stability compared to its methylammonium (MA) counterpart, FAPbI₃ is now the gold standard for achieving power conversion efficiencies (PCEs) exceeding 25%.

However, any serious computational study—whether it involves Density Functional Theory (DFT), molecular dynamics (MD), or geometric optimization—starts with a single, critical file: the CIF (Crystallographic Information Framework) file. fapbi3 cif file

But finding a reliable, phase-accurate fapbi3.cif file is surprisingly non-trivial. Why? Because FAPbI₃ exists in multiple polymorphs (primarily cubic α-phase and hexagonal δ-phase), and its structure is highly sensitive to temperature and lattice strain.

This article provides a comprehensive overview of what the FAPbI₃ CIF file contains, where to find it, how to validate it, and how to use it in common software like VESTA, Quantum ESPRESSO, and VASP. Conclusion: The search is almost certainly for Formamidinium

This is a powerful tool for computational chemists.

Below is a typical CIF entry for cubic α-FAPbI₃ at room temperature (simplified for clarity). We will break down each section. This is a powerful tool for computational chemists

data_FAPbI3_alpha
_audit_creation_method             'Generated by VESTA'
_cell_length_a                      6.3620
_cell_length_b                      6.3620
_cell_length_c                      6.3620
_cell_angle_alpha                   90.00
_cell_angle_beta                    90.00
_cell_angle_gamma                   90.00
_cell_volume                        257.52
_symmetry_space_group_name_H-M      'Pm-3m'
_symmetry_Int_Tables_number         221
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, -y, -z'
... (additional symmetry operators for cubic)
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_B_iso_or_equiv
Pb1   Pb    0.00000   0.00000   0.00000   1.00   2.50
I1    I     0.00000   0.00000   0.50000   1.00   3.00
I2    I     0.00000   0.50000   0.00000   1.00   3.00
I3    I     0.50000   0.00000   0.00000   1.00   3.00
FA1   C     0.50000   0.50000   0.50000   0.50   5.00
FA2   N     0.50000   0.50000   0.50000   1.00   4.50