Pressure-induced two-dimensional to three-dimensional structural phase transition in 2H-type layered lead iodide PbI2
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2022-01-31 |
| Journal | Applied Physics Letters |
| Authors | Junfeng Ding, Peng Cheng, Tingting Ye, Wan Xu, Hong Zeng |
| Institutions | University of Science and Technology of China, Institute of Solid State Physics |
| Citations | 10 |
Abstract
Section titled âAbstractâ2H-type lead iodide (PbI2) is a two-dimensional (2D) layered semiconductor and has recently received considerable attention as a precursor for lead halide perovskite solar cells. Although the pressure-induced structural phase transitions of PbI2 have been investigated for several decades, the detailed crystalline structure of PbI2 at high pressure is still elusive because of lacking in situ x-ray diffraction (XRD) studies. In this report, in situ Raman spectra and XRD patterns of 2H-PbI2 under pressure have been investigated in a diamond-anvil cell. Both Raman spectra and XRD patterns provide consistent evidence for two structural phase transitions upon compression at approximately 0.58 and 2.6 GPa. The XRD patterns suggest that the complete pressure-driven phase transition sequence of PbI2 up to 20 GPa is two-dimensional hexagonal 2H-P3ÂŻm1âpolytype 4H-P3m1âthree-dimensional (3D) orthorhombic Pnma. The uncovered 2D to 3D structural transition in 2H-PbI2 advances the understanding of structural stability of 2H-type layered semiconductors and lead halide perovskite.