Local Versus Long‐Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic–Inorganic Lead Halide Perovskites

Photoluminescence: Local Versus Long‐Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic–Inorganic Lead Halide Perovskites (Adv. Sci. 9/2015)

Origin of long lifetime of band-edge charge carriers in organic-inorganic lead iodide perovskites.

Long carrier lifetime is what makes hybrid organic-inorganic perovskites high-performance photovoltaic materials. Several microscopic mechanisms behind the unusually long carrier lifetime have been proposed, such as formation of large polarons, Rashba effect, ferroelectric domains, and photon recycling. Here, we show that the screening of band-edge charge carriers by rotation of organic cation ...

Transcending the slow bimolecular recombination in lead-halide perovskites for electroluminescence

The slow bimolecular recombination that drives three-dimensional lead-halide perovskites' outstanding photovoltaic performance is conversely a fundamental limitation for electroluminescence. Under electroluminescence working conditions with typical charge densities lower than 1015 cm-3, defect-states trapping in three-dimensional perovskites competes effectively with the bimolecular radiative r...

Photo-induced halide redistribution in organic–inorganic perovskite films

Organic-inorganic perovskites such as CH3NH3PbI3 are promising materials for a variety of optoelectronic applications, with certified power conversion efficiencies in solar cells already exceeding 21%. Nevertheless, state-of-the-art films still contain performance-limiting non-radiative recombination sites and exhibit a range of complex dynamic phenomena under illumination that remain poorly un...

Study of Local Structure in Selected Organic–Inorganic Perovskites in the Pm3jm Phase

The local structures of the inorganic component of selected organic–inorganic perovskites (OIPs) are studied by analyzing the X-ray pair distribution function. Whereas the long-range structure of each perovskite is the untilted Pm3jm phase, all the OIPs showed significant internal distortion of the octahedra. Varying the halide has a significant impact on the lattice constant. There is evidence...