Structural and optical characteristics of nickel bis(acetylacetonate) thin films as a buffer layer for optoelectronic applications
Structural and optical characteristics of nickel bis(acetylacetonate) thin films as a buffer layer for optoelectronic applications
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DOI：
10.1016/j.mssp.2019.05.008
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发表时间：
2019-09-01
影响因子：
4.1
通讯作者：
El-Mahalawy, Ahmed M.
中科院分区：
文献类型：
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作者：
El-Mahalawy, Ahmed M.
由于大多数光电应用对低成本和无毒缓冲层的坚持要求，双（乙酰丙酮）镍（Ni（acac）（2））的光学性质被研究用于这一前景。本研究对热蒸发Ni（acac）（2）薄膜的线性和非线性光学性质进行了深入的研究，并对其结构和形貌进行了表征。热重分析表明Ni（acac）（2）在461 K以下是稳定的。利用X射线衍射（XRD）和高分辨透射电子显微镜（HRTEM）研究了沉积膜的结构特性。XRD和HRTEM结果显示沉积膜具有[100]择优取向的多晶性质，平均晶粒尺寸约为108 nm。此外，原子力显微镜，AFM，场发射扫描电子显微镜，FESEM，被用来检查所制备的薄膜的表面形貌。此外，分光光度法用于评估所制备的薄膜的线性和非线性光学常数。从单振子模型的观点出发，测定和分析了Ni（acac）（2）的色散参数。宽的带隙（E（g）（类似于）3.6eV）、高透明度和小的Urbach能量值（E（u）（类似于）76meV）使该材料有资格用作缓冲层。估算了薄膜的非线性折射率和三阶极化率等非线性光学参数。计算了Ni（acac）（2）薄膜的分子极化率和光学电负性，分别为3.18和1.98。所得结果为乙酰丙酮镍缓冲大部分商业光电应用提供了机会。
Due to the insisted requirement for low cost and a nontoxic buffer layer for the most of optoelectronic applications, optical properties of nickel bis(acetylacetonate), Ni(acac)(2), are examined for this prospect. This research represents a deep investigation of the linear and nonlinear optical properties of thermally evaporated Ni(acac)(2) thin films accompanied by structural and morphological characterization. The thermogravimetric thermogram revealed the stability of Ni(acac)(2) up to 461 K. The structural properties of the deposited film are investigated using x-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The XRD and HRTEM results revealed the polycrystalline nature of as-deposited film with [100] preferred orientation and average crystallite size about 108 nm. Furthermore, both atomic force microscopy, AFM, and field emission scanning electron microscopy, FESEM, are employed to inspect the surface topography of the prepared film. In addition, the spectrophotometric method is utilized for evaluating the linear and nonlinear optical constants of the prepared films. The dispersive parameters of Ni(acac)(2) is determined and analyzed in the point of view of the single oscillator model. The wide band gap (E(g)(similar to)3.6 eV), high transparency and the small value of Urbach energy (E(u)(similar to)76 meV) qualify this material to be utilized as a buffer layer. The nonlinear optical parameters of the fabricated film such as nonlinear refractive index and third order optical susceptibility are estimated. Both molecular polarizability and the optical electronegativity of Ni(acac)(2) thin film is calculated and found to be 3.18 angstrom(3) and 1.98, respectively. The obtained results give the opportunity to nickel acetylacetonate for buffering most of the commercial optoelectronic applications.