Scientists at Canada-based McGill University have reportedly observed the behavior of electrons in cesium-lead iodide (CsPbI3) perovskite nanocrystals over femtoseconds, and discovered they exhibit the behavior of a liquid.
Using a multi-dimensional electronic spectrometer developed at the university, observation of the electrons was conducted over extraordinarily short periods of time ' down to 10 femtoseconds, or ten millionths of a billionth of a second.
The authors claim the two-dimensional electronic spectroscopy they used revealed irreversible, diffusive dynamics qualitatively inconsistent with the coherent dynamics in covalent solids such as cadmium selenide quantum dots; and liquid-like structural dynamics on a 10-femtosecond timescale.
The finding is said to offer particular promise for research into the prevention of polaron formation, which affects electron transport in hybrid perovskites.
'Polaron formation arises from the dynamical coupling of atomic fluctuations to electronic states,' the researchers wrote. 'Measuring the properties of these fluctuations is therefore essential in light of potential optoelectronic applications.'
