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.

中文翻译：

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用于光电化学应用的零维和一维无铅钙钛矿

开发用于光电化学应用的 100% 无铅钙钛矿材料是当前研究场景中的热门话题。在此，通过改变制备策略，我们合成了两种不同的无铅卤化锰钙钛矿纳米晶体 (NCs)，CsMnCl ₃ (H ₂ O) ₂ (1D-CMC ₃ H) 和 Cs ₂ MnCl ₄ (H ₂ O) ₂（0D-C ₂ MC ₄H），分别通过简单的超声处理/结晶和改进的配体辅助再沉淀（LARP）方法（室温合成）。首次使用极性溶剂甲醇代替二甲基甲酰胺 (DMF) 和二甲基亚砜 (DMSO) 合成钙钛矿 NC。这两种卤化锰钙钛矿表现出独特的形态依赖性光致发光特性。通过电化学阻抗谱 (EIS) 和线性扫描伏安法 (LSV) 评估了这两种基于卤化锰的钙钛矿 NCs 的光电化学性质。所制备的一维（1D）和零维（0D）卤化锰钙钛矿表现出更有效的光生电子-空穴对解离，以及在光照射下光电极上更快速的界面电荷转移。进一步改善一维-CMC的光电化学行为₃ H 和 0D-C ₂ MC ₄ H 钙钛矿光电极采用环保型 ZnO 实现。Mn-卤化物钙钛矿与 ZnO 的整体光电化学性能提供了优异的光捕获和电荷载流子性能。