File - Fapbi3 Cif

FAPbI₃ (formamidinium lead iodide) is a hybrid organic-inorganic perovskite with the chemical formula HC(NH₂)₂PbI₃. It is a promising light-absorbing material in high-efficiency perovskite solar cells (PSCs) due to its optimal band gap (~1.48 eV) and excellent thermal stability compared to its methylammonium counterpart (MAPbI₃).

The most accurate structural parameters often come directly from the seminal papers. The definitive structure was elucidated by researchers like M. Grätzel and colleagues.

Goal: Obtain a DFT-ready cubic α-FAPbI₃ structure.

From the CIF coordinates, you can calculate:

The FAPbI₃ CIF file is more than a text file; it is a blueprint of the most promising photovoltaic material of the decade. When you open a .cif for FAPbI₃:

By mastering the CIF format, researchers can accurately model optoelectronic properties, predict stability, and engineer better perovskite solar cells.

Finding a reliable Crystallographic Information File (CIF) Formamidinium Lead Iodide (FAPbI₃)

is essential for modeling its various phases, particularly the photoactive black -phase and the yellow non-perovskite 1. Key Structural Data for FAPbI₃ fapbi3 cif file

Depending on the phase you are modeling, the parameters in the CIF will differ significantly: -Phase (Black Cubic): This is the high-performance phase used in solar cells. Space Group: (No. 221). Lattice Parameter ( Approximately Structure: Corner-sharing cap P b cap I sub 6 octahedra with disordered cap F cap A raised to the positive power cations at the center. -Phase (Yellow Hexagonal): The thermodynamically stable phase at room temperature. Space Group: cap P 6 sub 3 m c (No. 186). Structure: Face-sharing cap P b cap I sub 6 octahedra linked into chains. 2. Verified Sources for CIF Files

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

CIF (Crystallographic Information Framework) file is the digital DNA of one of the most exciting materials in modern science: Formamidinium Lead Iodide

file might look like a dry list of coordinates and symmetry groups to the uninitiated, it actually contains the blueprint for the "Black Diamond" of solar energy. Here is why this specific file is a big deal in the world of materials science. 1. The Recipe for the "Ideal" Perovskite

is the "goldilocks" material for next-generation solar cells. The CIF file describes a structure where a large organic molecule— Formamidinium )—sits inside a cage of lead and iodine. The Magic Ratio:

Its crystal structure allows it to absorb sunlight almost perfectly across the visible spectrum. The Bandgap: It has a near-ideal bandgap of is approximately equal to 1.48

eV, which is the "sweet spot" for converting sunlight into electricity with maximum efficiency. 2. The Structural Drama: If you open an FAPbI Goal: Obtain a DFT-ready cubic α-FAPbI₃ structure

CIF file, you are likely looking at one of two "moods" of the material: The Alpha Phase (

This is the high-performance, beautiful black cubic crystal. This is what scientists want for solar panels. The Delta Phase (

This is the "lazy" yellow hexagonal phase. It is thermodynamically stable at room temperature but useless for solar energy.

The CIF file is the definitive proof of which version you’ve created in the lab. Bridging the gap between these two phases is currently one of the biggest challenges in renewable energy research. 3. Molecular "Tumbling"

Unlike simple table salt, the Formamidinium ion in the center of the FAPbI

cage isn't static. The CIF file often reflects a high degree of

because the molecule is actually spinning and tumbling inside its iodine cage. This "dynamic disorder" is thought to be the secret reason why these materials can transport electricity so easily despite having many internal defects. 4. Why Researchers Hunt for This File When a scientist downloads a FAPbI CIF file from a database like the Crystallography Open Database (COD) , they aren't just looking at dots; they are: Simulating the Future: Edit symmetry: Data → Symmetry → Pm-3m

Plugging the coordinates into supercomputers to predict how the material will react to heat, moisture, or pressure. X-Ray Fingerprinting:

Comparing the file to their own experimental data to see if they successfully synthesized the "pure" black phase. In short, the FAPbI

CIF file is the bridge between a theoretical miracle and a tangible, high-efficiency solar panel on your roof. of the FAPbI CIF (like the cubic -phase or the hexagonal -phase) for a simulation?

Title: Structural Elucidation and Symmetry-Composition Relations in Formamidinium Lead Triiodide (FAPbI$_3$): A Deep Dive into the $Fm\bar3m$ to $Pm\bar3m$ Transition via Powder Diffraction Analysis

Abstract

Formamidinium lead triiodide (HC(NH$_2$)$_2$PbI$_3$ or FAPbI$_3$) represents the forefront of next-generation photovoltaic materials, offering a reduced bandgap closer to the Shockley-Queisser optimum compared to its methylammonium counterpart. However, the structural instability of the photoactive perovskite phase ($\alpha$-phase) remains a critical bottleneck. This paper provides a comprehensive crystallographic analysis of the FAPbI$_3$ Crystallographic Information File (CIF), focusing on the temperature-dependent phase transitions from the cubic $Fm\bar3m$ (or pseudo-cubic $Pm\bar3m$) structure to the non-perovskite hexagonal $P6_3mc$ phase. Through simulated Rietveld refinement and group-subgroup analysis, we deconvolute the orientational disorder of the formamidinium cation and its impact on the lattice parameters, offering a definitive guide for interpreting experimental diffraction data.