The exploration of new physical properties for various THz-based applications, such as THz-wave sensing, modulation, and imaging devices, is a key challenge in the research on organic–inorganic hybrid perovskite materials. These THz-based applications require satisfactory, sensitive, and stable absorption properties with values between 0.5 and 3 THz. To achieve these properties, candidate materials should possess a purified structure that induces regular and fixed phonon modes without any defects or impurities. CH₃NH₃PbBr₃, an organic–inorganic hybrid perovskite thin film produced by a sequential vacuum evaporation method on a flexible PET substrate, was investigated in this study. Although the thin film contains only molecular defects related to CH₃NH₂ incorporated into the perovskite structure, our THz-wave absorption measurement and first-principles simulation confirmed that these molecular defects do not influence the three phonon modes originating from the transverse vibration (0.8 THz), the longitudinal optical vibrations (1.4 THz) of the Pb–Br–Pb bonds, and the optical Br vibration (2.0 THz). After spin-casting an ultrathin PTAA polymer protective layer (5 nm) on the hybrid perovskite thin film, it was additionally observed that there was no significant effect on the phonon modes. Thus, this novel flexible organic–inorganic hybrid perovskite material is a potential candidate for THz-based applications.

探索各种基于太赫兹的应用的新物理特性，例如太赫兹波感测，调制和成像设备，是有机-无机杂化钙钛矿材料研究中的关键挑战。这些基于THz的应用需要令人满意的，敏感的和稳定的吸收特性，其值介于0.5和3 THz之间。为了获得这些特性，候选材料应具有能够引发规则和固定的声子模式且没有任何缺陷或杂质的纯化结构。本研究研究了通过连续真空蒸发法在柔性PET基板上生产的有机-无机杂化钙钛矿薄膜CH ₃ NH ₃ PbBr ₃。尽管薄膜仅包含与CH相关的分子缺陷_将3 NH ₂掺入钙钛矿结构中，我们的太赫兹波吸收测量和第一性原理模拟证实，这些分子缺陷不会影响源自横向振动（0.8 THz），纵向光学振动（1.4 THz）的三种声子模。 Pb–Br–Pb键的结合以及光学上的Br振动（2.0 THz）。在杂化钙钛矿薄膜上旋铸超薄PTAA聚合物保护层（5 nm）之后，还观察到对声子模态没有显着影响。因此，这种新颖的柔性有机-无机杂化钙钛矿材料是基于太赫兹应用的潜在候选材料。