Ultrathin BiOCl crystals grown in highly disordered vapor micro-turbulence for deep ultraviolet photodetectors  

作　　者：Qing Guo Xiu-Jun Wang Lin Wang Xin Ye A-Lei Li Xiao-Hang Pan Yun-Lei Zhong Yong Zhang Li-Xing Kang 

机构地区：[1]Key Laboratory of Multifunctional Nanomaterials and Smart Systems,Division of Advanced Materials,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China [2]Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Science,Tianjin University,Tianjin 300072,China [3]School of Electronic and Information Engineering,Changshu Institute of Technology,Changshu 215500,China

出　　处：《Rare Metals》2024年第11期5921-5931,共11页稀有金属（英文版）

基　　金：financially supported by Jiangsu Funding Program for Excellent Postdoctoral Talent(Nos.2023ZB695 and 2023ZB167);China Postdoctoral Science Foundation(Nos.2023M742557 and 2023M742561);the National Natural Science Foundation of China(No.52372055);the Basic Research Development Program of Suzhou(No.SJC2023004);Jiangsu Independent Innovation Fund Project of Agricultural Science and Technology(No.CX(21)3163)。

摘　　要：Crystallization,while a common process in nature,remains one of the most mysterious phenomena.Understanding its physical mechanisms is essential for obtaining high-quality crystals.Typically,crystals grown by thermal evaporation or sublimation nucleate the substrate facing the evaporation source.Here,a novel vapor micro-turbulence mass transport mechanism in the growth process of ultrathin BiOCl single crystals has been revealed.In this mechanism,the precursor vapor bypasses the solid substrate,forming micro-turbulent vaporizing flows to nucleate on the surface of the substrate facing away from the evaporation source.Considering nucleation kinetics,fast shear flows are known to cause secondary nucleation,increasing nucleation quantity while decreasing the final size of the crystals.Thus,the nucleation and growth process of BiOCl crystals are controlled by adjusting the micro-turbulence intensity to reduce shear flow energy and dilate phase distribution,resulting in BiOCl crystals with uniform distribution and regular shape.Subsequent structural and morphological characterization confirms the high crystallization quality of the obtained crystals,and the performance of the constructed solar-blind photodetectors is comparable to that of similar devices.These findings contribute to a deeper understanding of vapor mass transport and crystal growth techniques and may be useful for applications related to metal oxide crystals.

关 键 词：Ultrathin metal oxides crystals Micro-turbulence Microspacing sublimation Ultraviolet photodetectors Crystallization 

分 类 号：TN23[电子电信—物理电子学] O782[理学—晶体学]