The paper describes the first ultrafast direct measurement of structural dynamics and heat release under high excitation in 2D perovskites. These materials are used in highly efficient perovskite solar cells and for various optoelectronic applications. The SLAC National Accelerator Laboratory’s Stanford PULSE Institute is one of the few facilities in the world with pulsed lasers able to drive the creation of an electron-hole plasma in semiconductors and capture the femtosecond-scale structural changes. These experiments lead to the direct visualization of how an exciton gas beyond its Mott-transition produces deep modification of the 2D perovskite cohesive energy. It also shows that the rigidity of the structure can be controlled by changing the organic cation spacer between the perovskite layers.
 Jacky EVEN, Fonctions Optiques pour les Technologies de l’informatiON (FOTON) jacky.even insa-rennes.fr |
 Claudine KATAN, Institut des Sciences Chimiques de Rennes (ISCR) claudine.katan univ-rennes1.fr |
Rice University (Houston, USA), Northwestern University (Evanston, USA), University of Wisconsin (Madison, USA), SLAC National Accelerator Laboratory (Stanford, USA), ISCR (Rennes, France)
This work was financially supported (J.E.) by Institut Universitaire de France (IUF)
Ultrafast relaxation of lattice distortion in two-dimensional perovskites, H. Zhang, W. Li, J. Essman, C. Quarti, I. Metcalf, W.-Y. Chiang, S. Sidhik, J. Hou, A. Fehr, A. Attar, M.-F. Lin, A. Britz, X. Shen, S. Link, X. Wang, U. Bergmann, M. G. Kanatzidis, C. Katan, J. Even, J.-C. Blancon & A. D. Mohite Nat. Phys., 2023, hal-03958981
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