Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 45: Hybrid and Perovskite Photovoltaics III (Joint session of CPP, DS and HL, organized by CPP)

HL 45.5: Talk

Wednesday, March 9, 2016, 10:45–11:00, H11

Ferroelasticity in methylammonium lead halide perovskite? — •Ilka Hermes¹, Simon Bretschneider¹, Victor Bergmann¹, Dan Li¹, Alexander Klasen^1,2, Julian Mars¹, Wolfgang Tremel², Frédéric Laquai¹, Hans-Jürgen Butt¹, Markus Mezger^1,2, Rüdiger Berger¹, Brian Rodriguez³, and Stefan Weber^1,2 — ¹MPI for Polymer Research, Mainz — ²Johannes Gutenberg University, Mainz — ³University College Dublin, Ireland

Methylammonium lead halide (MAPbX₃) perovskite materials show an outstanding performance in photovoltaic devices. However, some material properties, especially the possible ferroic behavior, remain unclear. We observed distinct nanoscale periodic domains in the piezoresponse of MAPbI₃(Cl) grains. The structure and the orientation of these striped domains is indicating ferroelasticity as their origin. By correlating vertical and lateral piezoresponse force microscopy experiments performed at different sample orientations with x-ray diffraction, the preferred domain orientation was assigned to the a₁−a₂-phase. The observation of the twin domains appears to strongly depend on the preparation route and the film texture and is thought be induced by internal strain during the cubic-tetragonal phase transition.