Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 66: Focus Session (CPP with HL): Hybrid photovoltaics and perovskites I

HL 66.10: Talk

Thursday, March 19, 2015, 12:30–12:45, C 130

Recombination behaviour of hybrid perovskite thin films studied by low temperature photoluminescence — Sergej Levcenco, Amrita Mandal Bera, Dan Wargulski, Ibrahim Simsek, and •Thomas Unold — Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, 14109 Berlin

Hybrid organometal perovskites recently have been successfully implemented as absorber layers in high efficiency thin film solar cells. In particular the CH3NH3PbI3 based materials show long minority carrier recombination lifetimes, implying a minor role of non-radiative recombination even at room temperature. In order to better understand the radiative recombination properties we have studied hybrid perovskite layers on glass, which where pepared by immersion of polycrystalline PbI2- thin films into methylammoniumiodide dissolved in isopropanol. The perovskite layers show high luminescence efficiencies at room temperature with a broad peak centered at around 1.6eV. At low temperature, several additional transitions are observed, which shift with temperature and show significant thermal quenching. Changes in the radiative emission caused by degradation of the layers under ambient conditions will also be reported.