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退火对合成于SiO/Si离子径迹模板中的ZnSe纳米晶体的结构、光学和电物理性质的影响

Annealing Effect on Structural, Optical and Electrophysical Properties of ZnSe Nanocrystals Synthesized into SiO/Si Ion Track Template.

作者信息

Akylbekova Aiman, Dauletbekova Alma, Baimukhanov Zein, Vlasukova Liudmila A, Usseinov Abay, Saduova Nuray, Akilbekov Abdirash T, Pankratov Vladimir A, Popov Anatoli I

机构信息

Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan.

Faculty of Radiophysics and Computer Technologies, Belarusian State University, Kurchatova Street 5, 220045 Minsk, Belarus.

出版信息

Materials (Basel). 2024 Aug 22;17(16):4149. doi: 10.3390/ma17164149.

DOI:10.3390/ma17164149
PMID:39203326
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11356022/
Abstract

We report the results of synthesis of zinc selenide (ZnSe) nanocrystals into SiO/Si track templates formed by irradiation with 200 MeV Xe ions up to a fluence of 10 ions/cm. Zinc selenide nanocrystals were obtained by chemical deposition from the alkaline aqueous solution. Scanning electron microscopy, X-ray diffractometry, Raman and photoluminescence spectroscopy, and electrical measurements were used for characterization of synthesized ZnSe/SiO/Si nanocomposites. XRD data for as-deposited precipitates revealed the formation of ZnSe nanocrystals with cubic crystal structure, spatial syngony F-43m (216). According to non-empirical calculations using GGA-PBE and HSE06 functionals, ZnSe crystal is a direct-zone crystal with a minimum bandgap width of 2.36 eV and anisotropic electronic distribution. It was found that a thermal treatment of synthesized nanocomposites at 800 °C results in an increase in ZnSe nanocrystallites size as well as an increase in emission intensity of created precipitates in a broad UV-VIS spectra range. However, vacuum conditions of annealing still do not completely prevent the oxidation of zinc selenide, and a formation of hexagonal ZnO phase is registered in the annealed samples. The current-voltage characteristics of the synthesized nanocomposites proved to have n-type conductivity, as well as increased conductivity after annealing.

摘要

我们报道了将硒化锌（ZnSe）纳米晶体合成到由200 MeV氙离子辐照形成的SiO/Si径迹模板中的结果，辐照通量高达10离子/cm²。通过从碱性水溶液中化学沉积获得硒化锌纳米晶体。使用扫描电子显微镜、X射线衍射、拉曼光谱和光致发光光谱以及电学测量对合成的ZnSe/SiO/Si纳米复合材料进行表征。沉积沉淀的XRD数据表明形成了具有立方晶体结构、空间群F-43m（216）的ZnSe纳米晶体。根据使用GGA-PBE和HSE06泛函的非经验计算，ZnSe晶体是一种直接带隙晶体，最小带隙宽度为2.36 eV，且电子分布具有各向异性。发现对合成的纳米复合材料在800°C下进行热处理会导致ZnSe纳米微晶尺寸增加，以及在宽紫外-可见光谱范围内生成沉淀的发射强度增加。然而，退火的真空条件仍不能完全防止硒化锌的氧化，并且在退火样品中记录到了六方ZnO相的形成。合成的纳米复合材料的电流-电压特性证明具有n型导电性，并且退火后导电性增加。

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