This work demonstrates a route to making mixed halide perovskite powders at room temperature by the anti-solvent-assisted crystallization method. Although, mixed halide CH₃NH₃PbBr_3−xCl_x perovskites have been prepared by different methods, however, to the best of our knowledge the anti-solvent-assisted crystallization method is employed here for the first time to prepare mixed halide CH₃NH₃PbBr_3−xCl_x perovskite powders. Solution-processed methyl ammonium lead tribromide CH₃NH₃PbBr₃ (x = 0) and different amounts of chloride (Cl) containing mixed halide perovskites (CH₃NH₃PbBr_3−xCl_x) were prepared for compositions of x = 0.5, 1, 1.25, 1.75. It reveals that bulk CH₃NH₃PbBr_3−xCl_x samples are highly crystalline and exists in pure single cubic phase with an increased tolerance factor as compared to pure CH₃NH₃PbBr₃. The CH₃NH₃PbBr₃ perovskite has space-group Pm-3 m and a cell parameter of 5.930 Å (volume = 206 Å). The synthesis route adopted here gives access to hybrid perovskites powders with high Cl content and hence enables the band gap to be precisely tuned over a range from 2.26 to 2.49 eV. The powder samples display the subtle shifts in the emission spectra and the photoluminescence kinetics exhibits a decrease in average lifetime by increasing the Cl contents due to the presence of trap states in the structures that encourage non-radiative recombination of charge carrier. Conventionally, the CH₃NH₃PbBr₃-based inverted solar cell architecture is prepared via mixing of the CH₃NH₃Br and PbBr₂ precursors. In contrast, herein, the precursor solutions are directly prepared from the CH₃NH₃PbBr₃ powder and the active layer of the inverted perovskite solar cells are then spin coated using this solution. The high V_oc value of the fabricated solar cells potentially makes it a promising candidate for tandem photovoltaic, photocatalytic water splitting, and semi-transparent photovoltaic applications.

这项工作展示了一种通过反溶剂辅助结晶方法在室温下制备混合卤化物钙钛矿粉的途径。尽管已通过不同方法制备了混合卤化物CH ₃ NH ₃ PbBr _{3− x} Cl _x钙钛矿，但是，据我们所知，这里首次采用了抗溶剂辅助结晶方法来制备混合卤化物CH ₃ NH ₃ PbBr _{3− x} Cl _x钙钛矿粉。固溶三甲基溴化甲基铵铅CH ₃ NH ₃ PbBr ₃（x ＝ 0）并且针对x  ＝0.5、1、1.25、1.75的组成制备了不同量的含有氯化物（Cl）的混合卤化物钙钛矿（CH ₃ NH ₃ PbBr _{3- x} Cl _x）。结果表明，与纯CH ₃ NH ₃ PbBr ₃相比，块状CH ₃ NH ₃ PbBr _{3− x} Cl _x样品具有较高的结晶度，并以纯单立方相形式存在，并且容限系数增大。CH ₃ NH ₃ PbBr ₃钙钛矿的空间群为Pm -3  m电池参数为5.930Å（体积= 206Å）。此处采用的合成路线可接触到高Cl含量的杂化钙钛矿粉末，因此能够在2.26至2.49 eV的范围内精确调整带隙。粉末样品显示出发射光谱中的细微变化，并且由于增加了Cl的含量，由于结构中存在陷阱态，从而促进了电荷载流子的非辐射重组，因此光致发光动力学显示出平均寿命的降低。常规地，基于CH ₃ NH ₃ PbBr ₃的倒置太阳能电池结构是通过混合CH ₃ NH ₃ Br和PbBr ₂来制备的前体。相反，本文中，前体溶液是由CH ₃ NH ₃ PbBr ₃粉末直接制备的，然后使用该溶液旋涂钙钛矿型太阳能电池的活性层。制成的太阳能电池的高V _oc值可能使其成为串联光伏，光催化水分解和半透明光伏应用的有希望的候选者。