Microscopic and Spectroscopic Study on the Superfluorescence of Quasi-2D Perovskite

Halide perovskites have seen a surge in interest in optoelectronic devices beyond their uses in solar cells and batteries. By using buffer molecules in fabrication, it is possible to inhibit the growth of perovskites along one dimension, creating a few layers thick film called quasi-2D perovskite. With a sufficiently high excitation power at room temperature, quasi-2D perovskite exhibits the phenomenon of superfluorescence in which emitters undergo cooperative spontaneous emission. Our quasi-2D perovskite thin-films have shown pulsed emission of enhanced decay rate, an indicator of superfluorescence. Moreover, we perform scanning transmission electron microscopy on the samples to corroborate the quadratic dependence of output intensity on the number of emitters. We find that the formation of a superlattice plays a significant role in generating the superfluorescence of quasi-2D perovskite.