Nanorod like crystalline CH₃NH₃PbI_3-xCl_x thin film was prepared by spray pyrolysis at an ambient atmosphere. X-ray diffraction (XRD) and Raman studies reveal the tetragonal perovskite phase of spray deposited film. The optical band gap of CH₃NH₃PbI_3-xCl_x is estimated to ~1.64 eV which is consistent with vacuum based deposited perovskites. The CH₃NH₃PbI_3-xCl_x film exhibits a high absorption coefficient of the order of 10⁶ m⁻¹. Photoluminescence (PL) study suggests that band-to-band radiative recombination occurs in CH₃NH₃PbI_3-xCl_x film. Cathodoluminescence study confirms the emission of 1.67 eV at 80 K and 1.80 eV at 300 K. In this study, the second harmonic generation at photon energy 3.6 eV is reported for the first time at room temperature (RT). It is noted that the band edge peak position at 1.67 eV is being diffused and shifted to 1.80 eV at RT while the second harmonic peak position at 3.6 eV remains unchanged.

纳米棒状结晶CH ₃ NH ₃ PbI _3-x Cl _x薄膜是通过在环境气氛下喷雾热解制备的。X射线衍射（XRD）和拉曼研究表明喷涂膜的钙钛矿相呈四方相。CH ₃ NH ₃ PbI _3-x Cl _x的光学带隙估计为〜1.64 eV，这与基于真空的沉积钙钛矿相一致。CH ₃ NH ₃ PbI _3-x Cl _x膜表现出高吸收系数，约为10 ⁶ m ^-1。光致发光（PL）研究表明，CH ₃ NH ₃ PbI _3-x Cl _x膜中发生了带间辐射复合。阴极发光研究证实在80 K时发射1.67 eV，在300 K时发射1.80 eV。在这项研究中，首次报道了在室温（RT）下以光子能量3.6 eV产生的二次谐波。应当注意，在RT处的1.67 eV处的带边缘峰位置正在扩散并移至1.80 eV，而在3.6 eV处的二次谐波峰位置保持不变。