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首页> 外文期刊>Nanotechnology >Near infrared to ultraviolet optical properties of bulk single crystal and nanocrystal thin film iron pyrite
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Near infrared to ultraviolet optical properties of bulk single crystal and nanocrystal thin film iron pyrite

机译：块状单晶和纳米晶薄膜黄铁矿的近红外至紫外光学性质

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摘要

We report optical properties of iron pyrite (FeS2) determined from ex situ spectroscopic ellipsometry measurements made on both a commercially available bulk single crystal and nanocrystalline thin film over a spectral range of 0.735-5.887 eV. The complex dielectric function, epsilon (E) = epsilon(1) (E) + i epsilon(2) (E), spectra have been determined by fitting a layered parametric model to the ellipsometric measurements. Spectra in epsilon are modeled using a Kramers-Kronig consistent critical point parabolic band model involving seven critical points for the bulk single crystal and four critical points for the nanocrystalline film. Absorption coefficient spectra for both types of samples are also determined from epsilon. Critical point features in the nanocrystalline films are broader, have lower amplitude and lower energy critical points detected having a small blue shift when compared to the single crystal sample.
机译：我们报告的铁黄铁矿（FeS2）的光学特性是通过在0.735-5.887 eV的光谱范围上对市售大块单晶和纳米晶体薄膜进行的异位光谱椭偏测量确定的。复介电函数ε（E）= epsilon（1）（E）+ i epsilon（2）（E）的光谱已通过将分层参数模型拟合到椭偏测量中来确定。使用Kramers-Kronig一致临界点抛物带模型对epsilon中的光谱进行建模，该模型包含七个单块体临界点和四个纳米晶膜临界点。两种类型的样品的吸收系数谱也从ε确定。与单晶样品相比，纳米晶体膜中的临界点特征更宽，具有更低的幅度和更低的能量临界点，且蓝移较小。

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