No (...but maybe slow?) dynamic tetragonal domains in cubic methylammonium lead triiodide

Nicholas Weadock^a, Peter Gehring^b, Aryeh Gold-Parker^c, Ian Smith^c, Hemamala Karunadasa^c^,^d, Michael Toney^a

^aSSRL Materials Science Division, SLAC National Accelerator Laboratory, USA, United States

^bNIST Center for Neutron Research, National Institute of Standards and Technology, USA, United States

^cDepartment of Chemistry, Stanford University, Stanford, 94305, United States

^dSLAC National Accelerator Laboratory, Stanford University, Stanford, CA, USA, United States

International Conference on Hybrid and Organic Photovoltaics
Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)

Online, Spain, 2020 May 26th - 29th

Organizers: Tracey Clarke, James Durrant, Annamaria Petrozza and Trystan Watson

Poster, Nicholas Weadock, 078
Publication date: 22nd May 2020

ePoster:

We investigate the hypothesis of dynamic tetragonal domains occuring in cubic CH₃NH₃PbI₃ using high-resolution neutron spectroscopy to study a fully deuterated single crystal. The R-point scattering above the 327.5 K tetragonal-cubic phase transition is always resolution-limited in energy and therefore inconsistent with dynamic domain predictions. This behavior is instead consistent with the central peak phenomenon observed in other perovskites. The scattering may originate from small, static, tetragonal-phase domains nucleating about crystal defects, and the temperature dependence demonstrates the transition is first-order.

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