Mamoon Ur Rashid, Z. Tahir, Muhammad Sheeraz, Farman Ullah, Yun Chang Park, Faisal Maqbool, Yong Soo Kim
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引用次数: 0
摘要
形态在确定卤化物包晶微晶的光学、电子和机械特性方面起着至关重要的作用。因此,开发在生长过程中精确控制晶体形态的策略是非常理想的。本研究提出了一种简单的方案,可在一次化学气相沉积(CVD)实验中同时生长出不同几何形状的溴化铯铅(CsPbBr3)微晶,包括微晶棒(MR)、微晶板(MP)和微晶球(MS)。通过战略性地调整前驱体蒸发温度、通量密度和基底温度,我们超越了以往的技术,在同一基底的不同位置实现了多种 CsPbBr3 几何形状的同时选择性生长。这种精细的生长控制归功于流体流动动力学、前驱体基底距离和基底温度的协同变化,从而提供了适合不同形态生长的区域。其中,包晶 MR 生长在基底的顶部,而 MP 和 MS 则分别生长在基底的中部和底部。结构分析表明,生长出来的包晶微晶具有很高的结晶度和正交相,而持续的光子激光表现出了它们的非线性光学特性,为它们在下一代光子和光电设备中的潜在应用奠定了基础。
Controlled Morphological Growth and Photonic Lasing in Cesium Lead Bromide Microcrystals
Morphology plays a crucial role in defining the optical, electronic, and mechanical properties of halide perovskite microcrystals. Therefore, developing strategies that offer precise control over crystal morphology during the growth process is highly desirable. This work presents a simple scheme to simultaneously grow distinct geometries of cesium lead bromide (CsPbBr3) microcrystals, including microrods (MR), microplates (MP), and microspheres (MS), in a single chemical vapor deposition (CVD) experiment. By strategically adjusting precursor evaporation temperatures, flux density, and the substrate temperature, we surpass previous techniques by achieving simultaneous yet selective growth of multiple CsPbBr3 geometries at distinct positions on the same substrate. This fine growth control is attributed to the synergistic variation in fluid flow dynamics, precursor substrate distance, and temperature across the substrate, offering regions suitable for the growth of different morphologies. Pertinently, perovskite MR are grown at the top, while MP and MS are observed at the center and bottom regions of the substrate, respectively. Structural analysis reveals high crystallinity and an orthorhombic phase of the as-grown perovskite microcrystals, while persistent photonic lasing manifests their nonlinear optical characteristics, underpinning their potential application for next-generation photonic and optoelectronic devices.