Unraveling the elastic properties of (quasi) two-dimensional hybrid perovskites: a joint experimental and theoretical study. Out-of-plane mechanical properties of 2D hybrid organic–inorganic perovskites by nanoindentation. Synthesis and crystal structures of inorganic–organic hybrids incorporating an aromatic amine with a chiral functional group. Synthesis, characterization and phase transitions of the inorganic–organic layered perovskite-type hybrids ( n = 12, 14, 16 and 18). Two-dimensional hybrid halide perovskites: principles and promises. 2D homologous perovskites as light-absorbing materials for solar cell applications. 2D Ruddlesden–Popper perovskites for optoelectronics.
Spin-dependent charge transport through 2D chiral hybrid lead-iodide perovskites. Spin control in reduced-dimensional chiral perovskites. Perovskite energy funnels for efficient light-emitting diodes. High-efficiency two-dimensional Ruddlesden–Popper perovskite solar cells. The enhanced charge transport boosts the photovoltaic efficiency of two-dimensional perovskite solar cells up to 18.3% by increasing the device’s fill factor and open-circuit voltage. Flux-dependent space-charge-limited current measurement reveals that light-induced interlayer contraction activates interlayer charge transport. Correlated charge transport, structural and photovoltaic measurements confirm that the onset of the light-induced contraction is synchronized to a threefold increase in carrier mobility and conductivity, which is consistent with an increase in the electronic band dispersion predicted by first-principles calculations.
X-ray photoelectron spectroscopy measurements show that constant light illumination results in the accumulation of positive charges in the terminal iodine atoms, thereby enhancing the bonding character of inter-slab I–I interactions across the organic barrier and activating out-of-plane contraction. Here, we report that continuous light illumination leads to >1% contraction in the out-of-plane direction in two-dimensional hybrid perovskites, which is reversible and strongly dependent on the specific superlattice packing. Understanding and tailoring the physical behaviour of halide perovskites under practical environments is critical for designing efficient and durable optoelectronic devices.
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