The solvent acidolysis crystallization technique is utilized to grow mixed dimethylammonium/methylammonium lead tribromide (DMA/MAPbBr₃) crystals reaching the highest dimethylammonium incorporation of 44% while maintaining the 3D cubic perovskite phase. These mixed perovskite crystals show suppression of the orthorhombic phase and a lower tetragonal-to-cubic phase-transition temperature compared to MAPbBr₃. A distinct behavior is observed in the temperature-dependent photoluminescence properties of MAPbBr₃ and mixed DMA/MAPbBr₃ crystals due to the different organic cation dynamics governing the phase transition(s). Furthermore, lateral photodetectors based on these crystals show that, at room temperature, the mixed crystals possess higher detectivity compared to MAPbBr₃ crystals caused by structural compression and reduced surface trap density. Remarkably, the mixed-crystal devices exhibit large enhancement in their detectivity below the phase-transition temperature (at 200 K), while for the MAPbBr₃ devices only insignificant changes are observed. The high detectivity of the mixed crystals makes them attractive for visible-light communication and for space applications. The results highlight the importance of the synthetic technique for compositional engineering of halide perovskites that governs their structural and optoelectronic properties.

中文翻译：

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混合二甲基铵/甲基铵卤化铅钙钛矿晶体用于改善结构稳定性和增强光电检测

溶剂酸解结晶技术用于生长混合二甲基铵/甲基三溴化铅 (DMA/MAPbBr ₃ ) 晶体，达到 44% 的最高二甲基铵掺入率，同时保持 3D 立方钙钛矿相。_{与 MAPbBr 3}相比，这些混合钙钛矿晶体显示出对正交相的抑制和较低的四方相到立方相转变温度。_{在 MAPbBr 3}和混合 DMA/MAPbBr ₃的温度依赖性光致发光特性中观察到明显的行为由于控制相变的不同有机阳离子动力学导致的晶体。此外，基于这些晶体的横向光电探测器表明，在室温下，由于结构压缩和表面陷阱密度降低，混合晶体与 MAPbBr _{3晶体相比具有更高的探测率。}值得注意的是，混合晶体器件在相变温度以下（200 K）下表现出极大的检测能力增强，而对于 MAPbBr ₃设备仅观察到微不足道的变化。混合晶体的高探测率使其对可见光通信和空间应用具有吸引力。结果突出了卤化物钙钛矿组成工程合成技术的重要性，该合成技术控制其结构和光电特性。