Kinetic analysis of the growth of semiconductor nanocrystals from the peak wavelength of photoluminescence
Kinetic analysis of the growth of semiconductor nanocrystals from the peak wavelength of photoluminescence
复制标题
从光致发光峰值波长进行半导体纳米晶体生长的动力学分析
DOI：
10.1051/epjap/2022210286
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Yang, Fuqian
中科院分区：
文献类型：
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作者：
Yang, Fuqian
了解控制半导体纳米晶体在液体溶液中生长的速率过程对于定制半导体纳米晶体的尺寸在光电子学、生物成像和生物传感等领域的应用具有重要意义。在静电相互作用对量子约束的贡献可以忽略的条件下，我们建立了半导体纳米晶体的光致发光（PL）峰值波长与生长时间之间的简单关系。利用这一关系和文献中关于CdSe和CdSe/ZnS纳米晶体的数据，我们证明了使用PL峰波长来分析CdSe和CdSe/ZnS纳米晶体在溶液中的生长行为的可行性。结果表明，CdSe/ZnS纳米晶在液相中以单体扩散为主要生长速率，CdSe纳米晶在液相中生长的活化能为~ 9 kJ/mol。讨论了用这种方法分析核壳纳米晶体在有机械应力和无机械应力情况下厚度增长的可行性。这种方法为原位监测/检查半导体纳米晶体在液体溶液中的生长开辟了新的途径。
Understanding the rate processes controlling the growth of semiconductor nanocrystals in liquid solutions is of great importance in tailoring the sizes of semiconductor nanocrystals for the applications in optoelectronics, bioimaging and biosensing. In this work, we establish a simple relationship between the photoluminescence (PL) peak wavelength and the growth time of semiconductor nanocrystals under the condition that the contribution of electrostatic interaction to the quantum confinement is negligible. Using this relationship and the data available in the literature for CdSe and CdSe/ZnS nanocrystals, we demonstrate the feasibility of using the PL peak wavelength to analyze the growth behavior of the CdSe and CdSe/ZnS nanocrystals in liquid solutions. The results reveal that the diffusion of monomers in the liquid solution is the dominant rate process for the growth of CdSe/ZnS nanocrystals, and the activation energy for the growth of CdSe nanocrystals in the liquid solution is ∼9 kJ/mol. The feasibility to use this approach in the analysis of the thickness growth of core–shell nanocrystals with and without mechanical stress is also discussed. Such an approach opens a new avenue to in-situ monitor/examine the growth of semiconductor nanocrystals in liquid solutions.