Compositional degradation with Br content in Cesium lead halide CsPbBrxI3-x

Supramolecular Framework Constructed by Dendritic Nanopolymer for Stable Flexible Perovskite Resistive Random‐Access Memory

“…Figure 3d shows the classical perovskite diffraction peaks at 14.1°, 28.4°, 31.8°, 40.6°, and 43.1°, which, respectively correspond to the diffraction signals of (110), (220), (310), (224), (314) crystal planes in the tetragonal structure. [ 49–51 ] Evidently, the 3D‐SF‐modification on the MAPbI 3 perovskite does not affect the perovskite crystal type due to the appearance of the same diffraction peaks. One of them, the intensity of characteristic diffraction peak of perovskite (110) crystal plane, first increases and then decreases with the increase of 3D‐SF‐modification concentration, reaching the maximum value at 4 mg mL −1 .…”

Cl alloying improves thermal stability and increases luminescence in iodine-rich inorganic perovskites

“…40,41 This instability is further exacerbated in ambient conditions as humidity catalyzes the g-CsPbI 3 to d-CsPbI 3 transition. 42 To improve phase stability, the community has taken an analogous approach to the organic-inorganic systems by alloying smaller halides into the lattice. For example, Nasstrom et al have shown that substituting I with Br to form CsPbI 2 Br delivers photo-active phase stability above z300 K. 37 In these high Br fraction CsPbI 2 Br alloys, Cl alloying has been studied as a strategy toward further improvement of grain growth and black-phase stability in ambient conditions.…”

Boosting Stability and Inkjet Printability of Pure-Red CsPb(Br/I)3 Quantum Dots through Dual-Shell Encapsulation for Micro-LED Displays

“…Specifically, this value was found to be 0.31 nm for single-halide α-CsPbI 3 and 0.28 nm for single-halide CsPbBr 3 , 40,41 which is consistent with prior literature reports on CsPbBr 3−x I x QDs. 42,43 Elemental mapping images revealed that the inner core consisted of Cs, Pb, and Br elements, while the outer shell was identified to be composed of Si and O elements. Furthermore, a linear scan on a larger nanoparticle showed Cs and Pb at 25−40 nm (indicating a perovskite core), Si at 40−60 and 15−20 nm (indicating a SiO 2 middle layer), and sparse C at 20−40 nm with higher concentrations at 60− 70 and 0−20 nm (suggesting an outer PS shell on individual nanoparticles).…”