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Phase transitions of formamidinium lead iodide perovskite under pressure
- Source :
- BASE-Bielefeld Academic Search Engine
-
Abstract
- The pressure-induced structural evolution of formamidinium-based perovskite FAPbI3 was investigated using in situ synchrotron X-ray diffraction and laser-excited photoluminescence methods. Cubic α-FAPbI3 ( Pm3̅ m) partially and irreversibly transformed to hexagonal δ-FAPbI3 ( P63 mc) at a pressure less than 0.1 GPa. Structural transitions of α-FAPbI3 followed the sequence of Pm3̅ m → P4/ mbm → Im3̅ → partial amorphous during compression to 6.59 GPa, whereas the δ-phase converted to an orthorhombic Cmc21 structure between 1.26 and 1.73 GPa. During decompression, FAPbI3 recovered the P63 mc structure of the δ-phase as a minor component (∼18 wt %) from 2.41-1.40 GPa and the Pm3̅ m structure of the α-phase becomes dominant (∼82 wt %) at 0.10 GPa but with an increased fraction of δ-FAPbI3. The photoluminescence behaviors from both the α- and δ-forms were likely controlled by radiative recombination at the defect levels rather than band-edge emission during pressure cycling. FAPbI3 polymorphism is exquisitely sensitive to pressure. While modest pressures can engineer FAPbI3-based photovoltaic devices, irreversible δ-phase crystallization may be a limiting factor and should be taken into account.
- Subjects :
- chemistry.chemical_classification
Phase transition
Photoluminescence
Iodide
Chemical engineering [Engineering]
Compression
02 engineering and technology
General Chemistry
Physical and Chemical Processes
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Biochemistry
Catalysis
0104 chemical sciences
Amorphous solid
Crystallography
Colloid and Surface Chemistry
Formamidinium
chemistry
Polymorphism (materials science)
Spontaneous emission
Orthorhombic crystal system
0210 nano-technology
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- BASE-Bielefeld Academic Search Engine
- Accession number :
- edsair.doi.dedup.....0c29b1df35203be0b04aaaab0493a723