The formation of local strain fields is a key aspect in understanding light-induced processes in semiconductors: For instance, electric conductivity is influenced by the formation of polarons, quasiparticles that evolve from the interaction of a charge carrier with the lattice. We performed pump-probe experiments with an X-ray Free-Electron Laser (XFEL) to measure the photoinduced X-ray scattering dynamics of epitaxial BiVO4 with femtosecond time resolution. We then compared this data to simulations of different localized strain fields in a regular quadratic lattice. While the material shows little diffuse scattering, comparison with simulations of an acoustic strain wave indicates that the material is contracting in a concerted motion.
The outstanding optoelectronic properties of hybrid metal halide perovskites, and their strong spin-orbit coupling, enable efficient manipulation of the charge carrier’s angular momentum. In this work, we investigate the dominant spin relaxation mechanism in CH3NH3PbBr3 films with doping levels up to 50% with the transition metal Mn2+. We investigate the spin relaxation times in these paramagnetic hybrid semiconductors with ultrafast circularly polarized broadband transient absorption spectroscopy at cryogenic temperatures. We report extended spin relaxation lifetimes by a factor of three which we explain with motional narrowing effects in the paramagnetic ensemble of Mn2+ impurities. Our work now presents paramagnetic doping of hybrid semiconductors as a promising concept for quantum technologies and spintronic devices.
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