Controlled Morphological Growth and Photonic Lasing in Cesium Lead Bromide Microcrystals

被引:0
|
作者
Rashid, Mamoon Ur [1 ,2 ]
Tahir, Zeeshan [1 ,2 ]
Sheeraz, Muhammad [1 ,2 ]
Ullah, Farman [3 ,4 ]
Park, Yun Chang [5 ]
Maqbool, Faisal [1 ,2 ]
Kim, Yong Soo [1 ,2 ]
机构
[1] Univ Ulsan, Dept Semicond Phys & Engn, Ulsan 44610, South Korea
[2] Univ Ulsan, Energy Harvest Storage Res Ctr, Ulsan 44610, South Korea
[3] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada
[4] Univ Waterloo, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada
[5] Natl Nanofab Ctr, Measurement & Anal Div, Daejeon 34141, South Korea
基金
新加坡国家研究基金会;
关键词
lead halide perovskite; morphology control; growth dynamics; precursor flux; temperature; epitaxial growth; lasing; PEROVSKITE NANOCRYSTALS; CSPBX3; VOLUME;
D O I
10.3390/nano14151248
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
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页数:14
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