Lead halide perovskites


Organisation:
Lehrstuhl für Festkörperphysik

FAU Contact:
Niesner, Daniel Dr.

Description:











Lead
halide perovskites form the basis of a promising new technology in
the field of photovoltaics. The efficiency of thin-film solar cells
made from these materials has rocketed to > 22% within only a
few years of research. Despite this rapid progress, a number of
questions regarding the basic properties of lead halide perovskites
remain open.



Lead
halide perovskites are complex ionic crystalline materials, since
they contain both heavy elements and typically also organic
components. They are mechanically soft, and atomic rearrangements can
efficiently be induced by thermal or optical excitation. The
resulting structural fluctuations modify the local electronic
structure and affect the charge transport. Significant spin
polarizations have been predicted to emerge.



We
track the dynamics in the system using a combination of photoemission
techniques, optical spectroscopy, and transport measurements. We put
a focus on the (dynamical) electronic structure and especially on the
possibility to generate an electronic spin polarization in lead
halide perovskites by optical excitation. The goal of this research
is to help develop a full description of the microscopic mechanisms
in solar cells made from perovskites and related materials. The
experiments are carried out in close collaboration with our partners
at the University of Erlangen-Nürnberg.



Assigned publications


Niesner, D., Hauck, M., Shrestha, S., Levchuk, I., Matt, G., Osvet, A.,... Fauster, T. (2018). Structural fluctuations cause spin-split states in tetragonal (CH3NH3)PbI3 as evidenced by the circular photogalvanic effect. Proceedings of the National Academy of Sciences of the United States of America, 115(38), 9509-9514. https://dx.doi.org/10.1073/pnas.1805422115
Niesner, D., Schuster, O., Wilhelm, M., Levchuk, I., Osvet, A., Shrestha, S.,... Fauster, T. (2017). The Optical Spectrum of Single-Crystal (CH3NH3)PbBr3 Cleaved in Ultrahigh Vacuum. Physical Review B.
Niesner, D., Wilhelm, M., Levchuk, I., Osvet, A., Shrestha, S., Batentschuk, M.,... Fauster, T. (2016). Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite. Physical Review Letters, 117(12). https://dx.doi.org/10.1103/PhysRevLett.117.126401

Last updated on 2019-22-01 at 18:02