A mixed-halide (I/Br) 2D/3D perovskite is formed by incorporating bromide via quaternary alkylammonium salt and iodide via methylammonium iodide. The X-ray diffraction analysis reveals the 2D/3D mixed constitution, with both components having mixed halide stoichiometry. Importantly, this tetrabutylammonium incorporated material not only exhibits almost two orders of magnitude enhancement of photoluminescence intensity but concurrently a higher photo-stability (at the desirable bandgap of 1.77 eV) than the pure 3D mixed halide case. Moreover, a significant increase (from 8.8 ns to 63 ns) is observed in the lifetime of the photo-generated carriers in the mixed halide 2D/3D material.
We have synthesized and studied a specific family of disulfide bridge based 2D organic inorganic hybrid perovskites using the cation, cystamine [2,2′-dithiobis(ethylammonium), abbreviated as SS] in the three lead halide (X = I, Br, and Cl) based systems, and explored their unique photo-physical properties. Green, blue, and white emissions are noted in I, Br, and Cl based systems, respectively. The experimental observations are compared with the results of first principles DFT calculations. The role of the halide ion (X) in the [Pb-X4] cages on the luminescence of the disulfide bridge based hybrid system is elucidated, and the corresponding systematics are analyzed.
For the first time, we have synthesized all-inorganic CsPbBr3/Cs4PbBr6 perovskite@COF nanocomposites in atmospheric conditions and tuned the crystal structures of the perovskite as well. The nanocomposite is reasonably stable and...
We demonstrate synthesis of an ew low-D hybrid perovskitoid (a perovskite-like hybrid halide structure,y ellow crystals,P 21/n space group) using zwitterion cysteamine (2aminoethanethiol) linker,a nd its remarkable molecular diffusion-controlled crystal-to-crystal transformation to Ruddlesden-Popper phase (Red crystals,P nma space group). Our stable intermediate perovskitoid distinctly differs from all previous reports by way of aunique staggered arrangement of holes in the puckered 2D configuration with af ace-sharing connection between the corrugated-1D double chains.The PL intensity for the yellowphase is 5orders higher as compared to the red phase and the corresponding average lifetime is also fairly long (143 ns). First principles DFT calculations conform very well with the experimental band gap data. We demonstrate applicability of the new perovskitoid yellow phase as an excellent active layer in as elf-powered photodetector and for selective detection of Ni 2+ via On-Off-On photoluminescence (PL) based on its composite with few-layer black phosphorous.
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