Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 5: Computational Materials Modelling: Materials at finite temperatures

MM 5.3: Talk

Monday, March 20, 2017, 10:45–11:00, IFW B

Hot carriers Relaxation Dynamics in Hybrid Perovskites — •Mohamed El-Amine Madjet — Qatar Environment and Energy Research Institute(QEERI), Hamad bin Khalifa University(HBKU), Doha, Qatar

Hybrid organic-inorganic perovskites, such as methylammonium lead iodide CH3NH3PbI3, have attracted a lot of attention as promising new absorber materials for solar energy. Recently, perovskite-based solar cells reported a conversion efficiency of more than 22%. However, many fundamental processes related to the photophysics of these materials remain not fully understood. The excitation of electrons from the valence band to conduction band results in the formation of hot electrons and holes. Right after this photo-excitation an ultrafast thermalization of the hot carriers takes place driven by electron-phonon interaction.

A mixed quantum-classical approach based on trajectory surface hopping is used in order to investigate the process of non-radiative carrier relaxation in perovskite. Results will be presented for different perovskite materials depending on their structures and compositions and will discuss ways how the thermalization time could be enhanced.