Dresden 2026 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics VI
CPP 48.2: Vortrag
Donnerstag, 12. März 2026, 11:45–12:00, ZEU/LICH
Reorientation-driven degradation in oriented perovskite films: shifting facet engineering to thermodynamic stability — •Xiaojing Ci1, Xiongzhuo Jiang1, Guangjiu Pan1, Kun Sun1, Altantulga Buyan-Arivjikh1, Zerui Li1, Lixing Li1, Thomas Baier1, Matthias Schwartzkopf2, and Peter Müller-Buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2DESY, Hamburg
Hybrid perovskite solar cells suffer from underexplored links between crystallographic orientation and thermal stability. We fabricate highly oriented mixed Sn-Pb perovskite films via an additive-free two-step method. Accelerated aging studies under high temperature reveal that high orientation paradoxically compromises stability and PSCs built from highly oriented perovskite films retain only 73% of their initial PCE versus 89% in less-oriented devices. Operando GIWAXS of the PSCs shows that thermal stress induces significant reorientation and lattice distortion in the oriented crystallites. Structural analyses confirm progressive crystallographic transitions, including grain reconfiguration, shifts toward isotropy, and systematic diffraction migrations. Critically, we demonstrate that metastability is an intrinsic consequence of high crystallographic order, which is why the very high alignment strategies that enhance performance induce thermodynamic vulnerability. This necessitates redesigning crystal engineering priorities where suppressing instability requires engineering thermodynamic equilibrium states over maximizing alignment for stable perovskite photovoltaics.
Keywords: tin-lead mixed perovskite; orientation; GIWAXS; solar cell; stability