Researchers pinpoint a lead-dominated Interaction impacting the carrier spin dynamics in halide perovskites

An international research team from TU Dort­mund Uni­ver­sity, the Russian Academy of Sciences and ETH Zürich has dis­cov­ered that the electron dynamics in perovskite crystals are largely determined by lead. This discovery suggests that replacing this element could enable better control of the crystals' material properties.

TU Dort­mund Uni­ver­sity Professor Dmitri Yakovlev's group investigated ultrafast interaction processes between optically excited charge carriers and their surroundings in perovskite crystals. The team was able to show that the magnetic properties can be regulated on an ultrafast time scale through the use of optical pulses with a duration of trillionths of a second. This proof that they can be con­trolled is of particular interest for possible new applications.

In addition, it was found that the lifetime of the magnetization of optically generated charge carriers is limited if they interact with nuclear spins. By far the most acute losses were observed in the interaction with the nuclear spin of lead. Thanks to this insight, researchers can now further investigate and develop the material in a targeted manner, by replacing lead with other elements in a series of tests.

Posted: Dec 07,2021 by Roni Peleg