Abstract

Composite films based on CH₃NH₃PbI₃ organometallic perovskite and mixed cellulose ester (CE) were studied using terahertz (THz) spectroscopy in the time domain. It is established that the introduction of CE into CH₃NH₃PbI₃ precursor significantly modifies the parameters of perovskite in the THz range and improves stability of the composite films. In particular, CE addition to the perovskite composite film leads to significant weakening of absorption bands in the region of 1–2 THz related to the excitation of low-frequency oscillatory modes in CH₃NH₃PbI₃ molecules. This can be explained by damping of these modes on CE molecules enveloping the perovskite molecules.

中文翻译：

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有机金属钙钛矿和混合纤维素酯在复合膜中的太赫兹吸收

摘要

在时域中使用太赫兹（THz）光谱研究了基于CH ₃ NH ₃ PbI ₃有机金属钙钛矿和混合纤维素酯（CE）的复合膜。已经证实，将CE引入CH ₃ NH ₃ PbI ₃前体中可以显着地改变钙钛矿在THz范围内的参数，并改善了复合膜的稳定性。特别是，在钙钛矿复合膜中添加CE会导致与CH ₃ NH ₃ PbI _3中低频振荡模式的激发有关的1-2 THz区域的吸收带明显减弱。分子。这可以通过阻尼包围钙钛矿分子的CE分子上的这些模式来解释。