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Effect of flow dynamics on the growth kinetics of CdS thin films in chemical bath deposition

机译:流动动力学对化学浴沉积中CdS薄膜生长动力学的影响

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摘要

During chemical bath deposition of CdS thin films, the solution is typically stirred to prevent unnecessary concentration gradient and precipitates sticking onto the film surface. Stirring rate changes the thickness of laminar boundary layer over the substrate, affecting the diffusion length of the reactants toward the substrate. It can also change hydrodynamic condition in the bath between laminar and turbulent flow. Interestingly, effect of stirring rate on the deposition kinetics of CdS thin films reported in the literature is conflicting. In this study, we showed that the diffusion-limited deposition kinetics has created a decreasing profile of film thickness along the sample as a function of boundary layer thickness when the substrate was under laminar flow and deposition temperature was between 45℃ and 63℃. On the other hand, the deposition became feed-limited when the substrate was under turbulent flow and the deposition temperature was between 45℃ and 63℃. While the hydrodynamic condition changed the deposition rate significantly, all the CdS films deposited showed a cubic crystal structure and the optical bandgap was slightly lower than that of single crystalline cubic CdS. The tensile stress in film probed by Raman spectroscopy can explain the low bandgap.
机译:在化学浴沉积CdS薄膜的过程中,通常会搅拌溶液以防止不必要的浓度梯度和沉淀物粘附在膜表面上。搅拌速度改变了基片上层状边界层的厚度,影响了反应物向基片的扩散长度。它还可以在层流和湍流之间改变水浴中的流体动力条件。有趣的是,文献中报道的搅拌速率对CdS薄膜沉积动力学的影响是矛盾的。在这项研究中,我们表明,当基底处于层流状态且沉积温度在45℃至63℃之间时,扩散受限的沉积动力学沿着样品形成的膜厚下降轮廓随边界层厚度的变化而变化。另一方面,当基板在湍流下并且沉积温度在45℃至63℃之间时,沉积变得受限于进料。尽管流体力学条件显着改变了沉积速率,但所有沉积的CdS膜均显示立方晶体结构,其光学带隙略低于单晶立方CdS。用拉曼光谱探测的薄膜中的拉应力可以解释低带隙。

著录项

  • 来源
    《Materials Chemistry and Physics》 |2012年第3期|779-783|共5页
  • 作者单位

    Department of Materials Science and Engineering, University of Texas, Arlington, TX 76019, USA;

    Department of Materials Science and Engineering, University of Texas, Arlington, TX 76019, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CdS; chemical bath deposition; turbulent flow; laminar flow;

    机译:硫化镉;化学浴沉积;湍流;层流;
  • 入库时间 2022-08-18 00:39:39

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