Publication date: 14th September 2021
Zwitterion cysteamine (2-aminoethanethiol) linker is employed for the first time to realize novel structural architectures of Hybrid Organic Inorganic lead perovskite framework and the applications of the same are also examined. In the solution based synthesis protocol a remarkable molecular diffusion-controlled crystal-to-crystal transformation of a perovskitoid structure to Ruddlesden-Popper phase (Red crystals, Pnma space group) is observed. The intermediate is stable and differs distinctly from all previous reports by way of a unique staggered arrangement of holes in the puckered 2D configuration with a face-sharing connection between the corrugated-1D double chains. This perovskitoid shows 5 orders of higher PL intensity along with an average lifetime of 143 ns as compared to the RP phase.
We demonstrate the perovskitoid nanocrystals upon compositing with few layer black phosphorus behave as a selective Ni2+ ion (1.79 x 10-3 M concentration) detection PL On-Off-On probe along with the mechanism for detection. A significant recovery of the average lifetime of the nanocomposite is observed upon interaction with Ni2+ ions. A self powered photodetector is demonstrated using the perovskitoid phase crystallites. More than a factor of 10 change is seen in the current upon photoirradiation (light intensity,1.5 mW/cm2) at 0V. the photodetector showed good photostability for the measured duration of time.
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