In recent years, hybrid halide and pseudohalide perovskites have been developed as a class of efficient photovoltaic absorbers with excellent electronic properties. Layered perovskite (CH₃NH₃)₂Sn(SCN)₂Cl₂ was recently identified as a promising PV candidate due to its increased stability and favorable electronic properties. Here, we demonstrate the optical and dielectric properties of 2D hybrid perovskites. The dielectric and ferroelectric properties were investigated in the frequency range from 20 to 2 MHz and the temperature range from 300 to 385 K. The temperature dependence of the dielectric constant at different frequencies leads to a diffusion peak, which is attributed to the appearance of the relaxed ferroelectric behavior in (CH₃NH₃)₂Sn(SCN)₂Cl₂. Complex impedance and modulus spectra unambiguously demonstrate the contribution of grain and grain boundary effects to the conduction properties of (CH₃NH₃)₂Sn(SCN)₂Cl₂. The equivalent circuit model [(R_gQ_g) (R_gbQ_gb)] is used to account for the electrical parameters associated with the different phases (grains and grain boundaries) with different relaxation times. The optical band gap of (CH₃NH₃)₂Sn(SCN)₂Cl₂ determined by UV–Vis spectroscopy reveals a band gap of 1.70 eV. These results suggest the possibility that (CH₃NH₃)₂Sn(SCN)₂Cl₂ analogs have properties suitable for photovoltaic top cells in tandem devices.

近年来，杂化卤化物和拟卤化物钙钛矿已被开发为一类具有优异电子性能的高效光伏吸收剂。层状钙钛矿（CH₃NH₃）₂Sn(SCN)₂Cl₂) (R< /span>))类似物具有适合串联装置中的光伏顶部电池的特性。 ₂Cl₂Sn(SCN)₂₃NH₃ 通过紫外-可见光谱测定显示带隙为 1.70 eV。这些结果表明以下可能性：(CH₂ Cl₂Sn(SCN)₂₃NH₃)] 用于考虑与相关的电气参数具有不同弛豫时间的不同相（晶粒和晶界）。 (CH_gbQ_gbgQ_g。等效电路模型 [(R_{22< /span>2}Sn(SCN)₂)₃NH₃。复阻抗和模量谱明确地证明了晶粒和晶界效应对 (CHCl₂Sn(SCN)₂)₃NH₃ 最近被认为是一种有前途的光伏候选材料，因为它具有更高的稳定性和良好的电子性能。在这里，我们展示了二维杂化钙钛矿的光学和介电特性。在 20 至 2 MHz 的频率范围和 300 至 385 K 的温度范围内研究了介电和铁电性能。不同频率下介电常数的温度依赖性导致扩散峰，这是由于出现了(CH