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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Hybrid and Perovskite Photovoltaics I
CPP 33.4: Talk
Wednesday, March 20, 2024, 17:15–17:30, H 0106
Deciphering the interplay of structure and charge carrier dynamics in reduced-dimensional perovskites — •Kun Sun1, Renjun Guo1, Shangpu Liu2, Xiongzhuo Jiang1, Yuxin Liang1, Matthias Schwarzkopf3, Felix Deschler2, and Peter Müller-Buschbaum1,4 — 1TUM, TUM School of Natural Sciences, E13, Garching, Germany — 2UOH, Physikalisch-Chemisches Institut, Heidelberg, Germany — 3Desy, Hamburg, Germany — 4TUM, MLZ, Garching, Germany
RDPs have advanced the development of PSCs due to their tunable energy landscape, structure, and orientation. Thus, we aim for an increase in the understanding of structure-photophysical properties of DJ and RP RDPs with different dimensionalities. Our findings reveal that RP RDPs with lower dimensionality exhibits a dominant n=2 phase, preferential out-of-plane orientation, and longer charge carrier lifetime compared with DJ RDPs, as evidenced by X-ray scattering technique and transient absorption spectroscopy. In addition, we unveil the film growth of respective RDPs by in-situ X-ray scattering, showing the stoichiometry-determined phase growth. The formation of lower-n phases in RP RDPs with higher dimensionality is thermodynamically favored, while those phases are likely in the form of intermediate phase, which bridge the 3d-like and lower-n phases in DJ RDPs. DJ RDPs with higher dimensionality demonstrate comparable phase purity, giving rise to more sufficient energy transfer and longer charge carrier lifetime. Our work paves the way for dictating the utilization of RDPs in both 3D and quasi-2D PSCs.
Keywords: 2D perovskite; in-situ GIWAXS