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arXiv 2109.01783cond-mat.mtrl-sciphysics.optics
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化学气相沉积大尺寸PdSe $_2$薄膜的层间光学和介电性能

Layer-dependent Optical and Dielectric Properties of Large-size PdSe$_2$ Films Grown by Chemical Vapor Deposition

MingYang Wei, Jie Lian, Yu Zhang, ChenLin Wang, Yueming Wang, Zhen Xu

摘要:

二硒化钯(PdSe $_2$)是一种新型的二维贵金属二卤化物(NMDCs),因其优异的电学和光电性能而受到广泛关注。在此,使用化学气相沉积(CVD)方法生长具有在3L-15 L范围内的层的高质量连续厘米级PdSe $_2$膜。吸收光谱和密度泛函理论计算表明,PdSe $_2$薄膜的禁带宽度随着层数的增加而减小,这是由于PdSe $_2$增强了轨道杂化作用.椭圆偏振光谱(SE)分析表明PdSe 2具有显著的层间光学和介电性质。这主要是由于PdSe $_2$薄膜在紫外波段具有独特的强激子效应。特别地,还观察了温度对PdSe $_2$薄膜光学性质的影响,并计算了不同层数的PdSe $_2$薄膜的热光系数。该研究为PdSe $_2$基光电子器件的制备和优化提供了理论指导。

英文摘要:

Palladium diselenide (PdSe$_2$), a new type of two-dimensional noble metal dihalides (NMDCs), has received widespread attention for its excellent electrical and optoelectronic properties. Herein, high-quality continuous centimeter-scale PdSe$_2$ films with layers in the range of 3L-15L were grown using Chemical Vapor Deposition (CVD) method. The absorption spectra and DFT calculations revealed that the bandgap of the PdSe$_2$ films decreased with increasing number of layers, which is due to PdSe$_2$ enhancement of orbital hybridization. Spectroscopic ellipsometry (SE) analysis shows that PdSe2 has significant layer-dependent optical and dielectric properties. This is mainly due to the unique strong exciton effect of the thin PdSe$_2$ film in the UV band. In particular, the effect of temperature on the optical properties of PdSe$_2$ films was also observed, and the thermo-optical coefficients of PdSe$_2$ films with different number of layers were calculated. This study provides fundamental guidance for the fabrication and optimization of PdSe$_2$-based optoelectronic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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