Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.44: Poster

Monday, March 12, 2018, 17:30–19:30, Poster B

Photoluminescence of Methylammonium Lead Iodide Perovskites in Terms of Stoichiometric Ratios — •Fabian Meier, Sebastian Reichert, Alexander Wagenpfahl, and Carsten Deibel — Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany

Understanding recombination mechanisms of electrical charge carriers is of tremendous importance for understanding the extraordinary power conversion efficiencies, which increased from 4 % up to almost 23 %. We investigate thin films of methylammionium lead iodide perovskite in terms of their stoichiometric ratio of methylammonium iodide and lead iodide. The perovskites are deposited on top of PTAA transport layers on ITO coated glass. By confocal photoluminescence measurements we determine radiative recombination of electric charges as function of time and spatial location. We discuss our results in terms of illumination intensity as well as temperature dependence and compare it to the energetically resolved emission spectra. We furthermore interpret our results in terms of tail states and their impact on the performance of solar cells.