AbstractBecause of the interesting features of the organic/inorganic halide perovskite (e.g., CH3NH3PbX3, X = Cl, Br) materials, such as long electron–hole diffusion length, high absorption coefficient and adjustable band gap, they have attracted a great deal of attention. In this research, CH3NH3PbX3 (X = Br, Cl) are synthesized and perovskite-based single-layer and perovskite-based bilayer diodes are fabricated. Using electron beam deposition technique, thin films of CH3NH3PbX3 (X = Br, Cl) hybrids with excellent homogeneity are manufactured. Absorption spectrum, X-ray spectrum and photoluminescence spectrum of organic/inorganic halide perovskites along with electroluminescence spectra, SEM micrographs and current–voltage characteristic of perovskite-based light-emitting diodes are investigated. Perovskite-based bilayer diodes are evaluated for the first time. The difference between the emission wavelengths of single-layer and bilayer diodes is the main characteristic of bilayer diodes. Manuscript profile

In recent years, three-dimensional hybrid perovskites (CH3NH3PbX3) with X=I, Br, and Cl have raised great attention due to their facile production methods and encouraging energy conversion efficiency in solar cells based on perovskite. A majority of the systematic studies on the regulation of the band gap in the family of organolead halide perovskites have focused on changing thecompositions of halogens. However, organic portion can provide a wider structural diversity in band gap and dimensionality in perovskite structures.Thus, Investigation of the structural and optical properties of organic-inorganic perovskitesby changing the organic portion seems to be necessary. The main focus of this work is the tetraphenylphosphonium substitutions at the organic portionin the hybrid perovskite structures.In this paper, fabrication of organic−inorganic hybrid perovskite TPP2PbX4, (TPP = P(C6H5)4; X = Cl), is reported.Thesynthesis method, crystal structure, and optical behavior of the synthesized perovskiteswere investigated. The organic cation effect on the optical properties and bandgap tuning were studied experimentally. The remarkable electronics and optical properties of 2D perovskite structurescould provide a different perspective and suggest the potential of these materials for photonics applications. Manuscript profile