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

Area of Science:

• Materials Science
• Nanotechnology
• Photochemistry

Background:

• Lead-free perovskites are crucial for sustainable photoelectrochemical (PEC) applications.
• Developing efficient and stable lead-free perovskite materials remains a significant challenge.

Purpose of the Study:

• To synthesize and characterize novel lead-free manganese halide perovskite nanocrystals (NCs).
• To investigate the morphology-dependent photoluminescence and PEC properties of these NCs.
• To evaluate the performance enhancement of these NCs when combined with eco-friendly ZnO.

Main Methods:

• Synthesis of CsMnCl3(H2O)2 (1D-CMC3H) and Cs2MnCl4(H2O)2 (0D-C2MC4H) using ultrasonication/crystallization and ligand-assisted reprecipitation (LARP).
• Utilized methanol as a polar solvent for perovskite NC synthesis.
• Characterization of PEC properties using electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV).

Main Results:

• Successfully synthesized two distinct lead-free manganese halide perovskite NCs with unique morphologies.
• Demonstrated morphology-dependent photoluminescence properties.
• Achieved efficient photogenerated electron-hole pair dissociation and rapid interfacial charge transfer in 1D and 0D Mn-halide perovskites.
• Observed enhanced PEC performance with the incorporation of ZnO, leading to excellent light-harvesting and charge carrier properties.

Conclusions:

• The synthesized lead-free manganese halide perovskites show great potential for photoelectrochemical applications.
• The combination with ZnO further boosts their performance, highlighting their utility in solar energy conversion.
• This work contributes to the development of sustainable and efficient perovskite-based PEC devices.