Zero- and One-Dimensional Lead-Free Perovskites for Photoelectrochemical Applications

Abstract

The development of 100% lead-free perovskite materials for photoelectrochemical applications is a hot topic in the current research scenario. Herein, by varying the preparation strategy, we have synthesized two distinct lead-free manganese halide perovskite nanocrystals (NCs), CsMnCl3(H2O)2 (1D-CMC3H) and Cs2MnCl4(H2O)2 (0D-C2MC4H), by simple ultrasonication/crystallization and a modified ligand-assisted reprecipitation (LARP) approach (room temperature synthesis), respectively. For the first time, a polar solvent methanol was used instead of dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) for the synthesis of perovskite NCs. These two manganese halide perovskites exhibit unique morphology-dependent photoluminescence properties. The photoelectrochemical properties of these two Mn-halide-based perovskite NCs were evaluated through electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV). The as-prepared one-dimensional (1D) and zero-dimensional (0D) Mn-halide perovskites exhibit more effectual dissociation of photogenerated electron–hole pairs as well as the presence of more rapid interfacial charge transfer on the photoelectrodes under light irradiation. Further improvement in the photoelectrochemical behavior of the 1D-CMC3H and 0D-C2MC4H perovskite photoelectrodes is achieved with eco-friendly ZnO. The overall photoelectrochemical performances of Mn-halide perovskites with ZnO afforded excellent light-harvesting and charge carrier properties.

A thermally induced fluorescence enhancement strategy for efficient all-inorganic rubidium manganese halide

“…S7d †), the peaks centered at 640.84 and 646.28 eV are assigned to Mn 2+ 2p 3/2 , while the peaks located at 653.36 and 658.07 eV are attributed to Mn 2+ 2p 1/2 . 36 Meanwhile, the peak at 642.10 eV originated from Mn 3+ 2p 3/2 . 37 When the structural water is partially removed from the Rb 2 MnBr 4 •2H 2 O lattice, the binding energy of Mn 2+ 2p 3/2 , Mn 2+ 2p 1/2 and Mn 3+ 2p 3/2 decreases to 640.77 and 646.22 eV, 653.30 and 658.01 eV, and 642.05 eV, respectively, because of the enhancing electron density around the Mn ions by lattice shrinkage.…”

Recent progress in metal halide perovskite-based photocatalysts: physicochemical properties, synthetic strategies, and solar-driven applications

“…The perovskite reactants undergo spontaneous precipitation and crystallization as a result of the shi in the solvent polarity, leading to a state of equilibrium in the system. 112,113,[130][131][132] The LARP approach to prepare MHPs was rst proposed by Papavassiliou et al in 2012. 131 Toluene was added to the MAPbX 3 solution, containing either (MA)-(CH 3 C 6 H 4 CH 2 NH 3 ) 2 Pb 2 X 7 or (MA)(C 4 H 9 NH 3 ) 2 Pb 2 X 7 (X = Br, Cl or I), in DMF or acetonitrile, then glowing nanocrystals were obtained.…”

“…Another work based on the LARP approach to synthesize lead-free manganese MHPs (1D-CMC 3 H and 0D-C 2 MC 4 H) used methanol as a nonpolar solvent at room temperature. 132 The photoelectrochemical test revealed that the nanocrystals produced had efficient separation of photogenerated charges and rapid interfacial charge transfer on the photoelectrodes. All in all, the LARP method is a modest technique for the synthesis of MHPs.…”

Influence of crystal structure and composition on optical and electronic properties of pyridinium-based bismuth iodide complexes

“…12 For example, low-dimensional manganese-based perovskites were reported by Xiao et al 13 which by phase transformation from 1D-CsMnCl 3 (H 2 O) 2 to 0D-Cs 3 MnCl 5 result in shift from red to bright green luminescence emission. Furthermore, Anthony group 8 used these materials with ZnO in light harvesting and asserted that their photoluminescence is a morphology-dependent process. Band gap engineering by changing the size and content of perovskites is a popular research topic.…”