Department of Physics, Kyung Hee University Seoul 02447, Republic of Korea.
J Nanosci Nanotechnol. 2020 Nov 1;20(11):6692-6697. doi: 10.1166/jnn.2020.18782.
We present parameters that allow the dielectric function ( = + 2) of perovskite SrTiO₃ (STO) to be calculated for spectral range from 0.74 to 6.42 eV and temperatures from 26 to 674 K. The data of STO were reproduced from a previous report. We use the Tauc-Lorentz model to express of STO analytically for each temperature. The spectra are successfully parameterized with six Tauc-Lorentz components and a pole. To obtain data for arbitrary energies and temperatures over the range given above, we interpolated the parameterized results using cubic polynomials. It is well known that STO has phase transitions near 40 and 105 K, which are reflected well in our modeling. Our data allow complex refractive indices to be calculated at any temperature for device design.
我们提出了一些参数，允许钙钛矿 SrTiO₃（STO）的介电函数（ = + 2）在 0.74 到 6.42 eV 的光谱范围内和 26 到 674 K 的温度下进行计算。STO 的数据是从前一份报告中重现的。我们使用 Tauc-Lorentz 模型来分析每个温度下 STO 的 。通过六个 Tauc-Lorentz 分量和一个极点成功地对 光谱进行参数化。为了在上述给定范围内的任意能量和温度下获得 数据，我们使用三次多项式对参数化结果进行插值。众所周知，STO 在 40 和 105 K 附近有相变，这在我们的模型中得到了很好的反映。我们的数据允许在任何温度下计算任何器件设计的复折射率。
