Comparative studies on the structural, morphological, optical, and electrical properties of nanocrystalline PbS thin films grown by chemical bath deposition using two different bath compositions
Comparative studies on the structural, morphological, optical, and electrical properties of nanocrystalline PbS thin films grown by chemical bath deposition using two different bath compositions
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DOI：
10.1016/j.mssp.2013.11.028
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发表时间：
2014-09
影响因子：
4.1
通讯作者：
T. Tohidi;K. Jamshidi-Ghaleh;A. Namdar;R. Abdi-Ghaleh
中科院分区：
文献类型：
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作者：
T. Tohidi;K. Jamshidi-Ghaleh;A. Namdar;R. Abdi-Ghaleh
采用化学浴沉积方法，在两种不同成分的镀液中制备了高质量的PbS薄膜。其中一个(BASH-І)含有醋酸铅、硫脲、氢氧化钠的水溶液，第二个(BASH-ІІ)含有额外的三乙醇胺。三乙醇胺的引入减小了PbS纳米粒子的颗粒尺寸，增加了其光学带隙。研究了所得薄膜的结构、形貌和光学性质，并与沉积时间进行了比较。用X射线衍射仪测定了薄膜的微晶尺寸、晶格常数和应变。原子力显微镜结果表明，BASE-I(PBS-I)样品的表面粗糙度和表面均方根斜率高于BASE-II(PBS-II)样品。获得了在近红外区具有高反射率(~61%)的PbS薄膜，这是我们太阳系的重要组成部分。计算了样品的禁带宽度、消光系数和折射率。此外，还进行了拉曼分析，并研究了样品的电学性质。
High-quality lead sulfide (PbS) thin films were synthesized by chemical bath deposition from two baths with different compositions. One of them (bath-І) contained an aqueous solution of lead acetate, thiourea, sodium hydroxide, and the second (bath-ІІ) had additional triethanolamine. The introduction of triethanolamine reduced the grain size and increased the optical band gap of the PbS nanoparticles. The structure, morphology, and optical properties of the obtained films were investigated and compared with respect to the deposition time. X-ray diffraction data were used to obtain the crystallite size, lattice constant, and strain of the films. Atomic force microscopy results show that the roughness and rms-surface slope of the samples obtained from bath-I (PbS-I) were higher than those of bath-II (PbS-II) samples. PbS thin films with high reflectance (~61%) in the near-infrared region, which is important in our solar system, were obtained. The band gap, extinction coefficient, and refractive index of the samples were calculated. Furthermore, Raman analysis was performed and electrical properties of the samples were studied.