Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Hybrid and Perovskite Photovoltaics I (joint session CPP/DF/DS/HL, organized by CPP)

CPP 7.1: Vortrag

Montag, 7. März 2016, 15:00–15:15, H38

Effect of phase transition on photoluminescence polarization of single perovskite nano-objects — •Daniela Täuber¹, Alexander Dobrovolsky¹, Rafael Camacho^1,2, and Ivan Scheblykin¹ — ¹Chemical Physics, Lund University, Lund, Sweden — ²Department of Chemistry, University of Leuven, Leuven, Belgium

We use 2D polarization resolved microscopy to study the polarization of single CH₃NH₃PbI₃ perovskite nano-objects in excitation and emission at 295, 152 and 77 K. Depending on size and shape, polarization of up to 70% was observed at 77 K in emission, while it is in general smaller in excitation, and it decreases with increasing temperature. For wire-shaped objects the polarization is along the long axis, which points to contributions from antenna effects and crystal growth direction in combination with asymmetric crystal structures. The difference seen in excitation and emission may be caused by the band structure and the excitation wavelength at 448 nm.

D.T. acknowledges a personal research grant DFG-TA 1049/1-1.