Journal: ACS Central Science

Article Title: Reversible Decomposition of Single-Crystal Methylammonium Lead Iodide Perovskite Nanorods

doi: 10.1021/acscentsci.0c00385

Figure Lengend Snippet: In situ TEM observation during annealing cycle. (a–h) Sequence of BF images acquired from a video obtained during heating and cooling cycles for perovskite conversion, decomposition, and recovery. The images (a–d and e–h) were obtained at 80, 100, 130, 155, 130, 100, 80 °C, and room temperature, respectively. The dark particles with strong contrast are PbI 2 . The scale bar is 50 nm. (i–k) BF images of the nanorods taken at room temperature after annealing cycles, with maximum annealing temperatures of 80, 100, and 130 °C during the respective cycles. The scale bar is 50 nm. The white arrows indicate PbI 2 ( R 3̅ m : H ) matrix, and orange and purple arrows indicate PbI 2 ( P 3̅ m : I ) particles and intermediate phase, respectively. (l) An indexed SAED pattern obtained at 100 °C with a weak e-beam without evaporating MAI from perovskite. (m–o) HRTEM images of the PbI 2 ( R 3̅ m : H ) matrix from parts d and h and of a PbI 2 ( P 3̅ m : I ) particle from part d. The scale bar is 2 nm.

Article Snippet: In situ TEM interrogation of the stability of the perovskite in the nanorod at a high pressure (2 × 10 –2 Torr) was carried out using an in situ TEM gas holder (1300 series, Hummingbird Scientific) with a modified gas flow system.

Techniques: In Situ, Sequencing