Bond model of Second Harmonic Generation inTetragonal and Orthorhombic Perovskite Structure

IF 1.8 4区 物理与天体物理 Q3 OPTICS
Hendradi Hardhienata, Hasan Al Kharfan, Salim Faci, Muhammad Birowosuto, Husin Alatas
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引用次数: 0

Abstract

We apply the simplified-bond-hyperpolarizability model (SBHM) to investigate second harmonic generation (SHG) from tetragonal and orthorhombic methylammonium (MA) lead (Pb) iodide (I) perovskite structures. Assuming that the SHG radiation comes from the anharmonic charges parallel to the Pb-I covalent bond vectors, we show explicitly how the reflective rotational anysotropy SHG (RASHG) intensity profiles arise via dipole superposition from the perovskite surface and that their bulk contribution is zero for both the tetragonal and orthorhombic bulk structures if the contribution from MA molecules can be neglected. In addition, we compare the third order susceptibility tensor obtained from group theory and SBHM and calculate the values for the nonzero components as well as derive the SHG intensity field formulas. We found that the tetragonal and orthorhombic perovskite SHG intensity profiles are different. Furthermore, our results show that even in relative complex systems such as metal halide perovskites (MHPs), RASHG experimental data can be fitted using only one independent fitting parameter, which is the effective Pb-I nonlinear hyperpolarizability. Therefore, the analysis of perovskite using an anharmonic bond model can lead to better efficiencies of photovoltaic devices, while it will also pave a way for the use of SHG in MHP crystals as frequency conversion and optical signal processing.
二次谐波生成的正交和正交钙钛矿结构键模型
我们应用简化键超极化模型(shhm)研究了四方和正交甲基铵(MA)碘化铅(Pb) (I)钙钛矿结构的二次谐波产生(SHG)。假设SHG辐射来自平行于Pb-I共价键向量的非调和电荷,我们明确地展示了反射旋转任意各向异性SHG (RASHG)强度分布是如何通过钙钛矿表面的偶极叠加产生的,并且如果MA分子的贡献可以忽略,那么它们对四方和正交体结构的体积贡献都为零。此外,我们还比较了由群理论和shbhm得到的三阶磁化率张量,计算了非零分量的值,并推导了SHG强度场公式。我们发现,四方型和正交型钙钛矿的SHG强度分布是不同的。此外,我们的研究结果表明,即使在金属卤化物钙钛矿(MHPs)等相对复杂的体系中,RASHG实验数据也可以仅使用一个独立的拟合参数进行拟合,即有效Pb-I非线性超极化率。因此,使用非谐波键模型分析钙钛矿可以提高光伏器件的效率,同时也为在MHP晶体中使用SHG作为频率转换和光信号处理铺平了道路。
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来源期刊
CiteScore
4.00
自引率
5.30%
发文量
374
审稿时长
2.1 months
期刊介绍: The Journal of the Optical Society of America B (JOSA B) is a general optics research journal that complements JOSA A. It emphasizes scientific research on the fundamentals of the interaction of light with matter such as quantum optics, nonlinear optics, and laser physics. Topics include: Advanced Instrumentation and Measurements Fiber Optics and Fiber Lasers Lasers and Other Light Sources from THz to XUV Light-Induced Phenomena Nonlinear and High Field Optics Optical Materials Optics Modes and Structured Light Optomechanics Metamaterials Nanomaterials Photonics and Semiconductor Optics Physical Optics Plasmonics Quantum Optics and Entanglement Quantum Key Distribution Spectroscopy and Atomic or Molecular Optics Superresolution and Advanced Imaging Surface Optics Ultrafast Optical Phenomena Wave Guiding and Optical Confinement JOSA B considers original research articles, feature issue contributions, invited reviews and tutorials, and comments on published articles.
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