Temperature-Dependent Intraband Relaxation of Hybrid Perovskites

Time-resolved intraband electronic relaxation dynamics of Hgn

clusters (n57 – 13,15,18) following intraband electronic excitation at 1250 nm ~1.0 eV!. This study furthers our previous investigation of single electron, intraband relaxation dynamics in Hgn 2 clusters at 790 nm by exploring the dynamics of smaller clusters (n57 – 10), as well as those of larger clusters (n511– 13,15,18) at a lower excitation energy. We measure relaxation time scales of 2–9 p...

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

Quantum and dielectric confinement effects in 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 in hybrid perovskites using absorption and photoluminescence (PL) spectroscopies. At temperatures below 75 K, we resolve splitting of the excitonic absorp...

Photostability of 2D Organic-Inorganic Hybrid Perovskites

We analyze the behavior of a series of newly synthesized (R-NH₃)₂PbX₄ perovskites and, in particular, discuss the possible reasons which cause their degradation under UV illumination. Experimental results show that the degradation process depends a lot on their molecular components: not only the inorganic part, but also the chemical structure of the organic moieties play an important role in bl...

Getting a charge out of hybrid perovskites.

Until now, metal–organic hybrid perovskites (MOHPs) have been known mainly for their remarkable electronic (1–3) and optical properties, generating immense interest worldwide and offering the potential to realize the goal of highly efficient and inexpensive solar power conversion (1, 4, 5) as well as a wide variety of other optoelectronic applications (6, 7). In an exciting development that pro...

Comparison of the temperature-dependent electronic structure of the perovskites La0.65A0.35MnO3 (A=Ca,Ba).