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Direct Observation of Electron–Phonon Coupling and Slow Vibrational Relaxation in Organic–Inorganic Hybrid Perovskites

2016; American Chemical Society; Volume: 138; Issue: 42 Linguagem: Inglês

10.1021/jacs.6b08175

1943-2984

Daniel B. Straus, Sebastian Hurtado Parra, Natasha Iotov, Julian Gebhardt, Andrew M. Rappe, Joseph E. Subotnik, James M. Kikkawa, Cherie R. Kagan,

Organic and Molecular Conductors Research

Quantum and dielectric confinement effects in Ruddlesden-Popper 2D hybrid perovskites create excitons with a binding energy exceeding 150 meV. We exploit the large exciton binding energy to study exciton and carrier dynamics as well as electron–phonon coupling (EPC) in hybrid perovskites using absorption and photoluminescence (PL) spectroscopies. At temperatures 75 K, excitonic absorption and PL exhibit homogeneous broadening. While absorption remains homogeneous, PL becomes inhomogeneous at temperatures <75K, which we speculate is caused by the formation and subsequent dynamics of a polaronic exciton.