Atomic-scale imaging of CH₃NH₃PbI₃ structure and its decomposition pathway.

ABSTRACT: Understanding the atomic structure and structural instability of organic-inorganic hybrid perovskites is the key to appreciate their remarkable photoelectric properties and understand failure mechanism. Here, using low-dose imaging technique by direct-detection electron-counting camera in a transmission electron microscope, we investigate the atomic structure and decomposition pathway of CH₃NH₃PbI₃ (MAPbI₃) at the atomic scale. We successfully image the atomic structure of perovskite in real space under ultra-low electron dose condition, and observe a two-step decomposition process, i.e., initial loss of MA⁺ followed by the collapse of perovskite structure into 6H-PbI₂ with their critical threshold doses also determined. Int

SUBMITTER: Chen S 

PROVIDER: S-EPMC8448763 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature