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首页> 外文期刊>ACS applied materials & interfaces >Stretching-Driven Crystal Anisotropy and Optical Modulations of Flexible Wide Band Gap Inorganic Thin Films
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Stretching-Driven Crystal Anisotropy and Optical Modulations of Flexible Wide Band Gap Inorganic Thin Films

机译：柔性宽带间隙无机薄膜的拉伸驱动晶体各向异性和光学调制

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摘要

Strain engineering has been extensively explored for tailoring the material properties and, in turn, improving the device performance of semiconducting thin films. In particular, the effects of strain on the optical properties of these films have attracted considerable research interest, but experimental demonstrations in flexible systems have rarely been reported. Here, we exploited the variable optical properties of flexible ZnS thin films by imposing a controllable external compressive stress during a stretching-driven deposition process. This stress induced crystal anisotropy with an increase in tetragonality, which differs from that of the unstrained cubic ZnS thin films. The refractive index of the films was estimated by means of an envelope method using interference fringes. As a result, the reductions in the refractive index and optical band gap were observed by applying the stretching-driven strains with the resultant compressive stress. The modulated refractive index and its dispersion behavior were further investigated by employing a single-oscillator model to drive subsequent correlative parameters such as dispersion energy, oscillating strength, and high-frequency permittivity. As a proof of concept, an optical lens of ZnS was designed to confirm the effect of in situ stress-mediated optical modulation by detecting the variable focal length with stress.
机译：应变工程广泛探索用于剪裁材料性能，然后改善半导体薄膜的装置性能。特别地，应变对这些薄膜的光学性质的影响引起了相当大的研究兴趣，但柔性系统的实验示范很少被报道。这里，我们通过在拉伸驱动的沉积过程中施加可控的外部压缩应力来利用柔性ZnS薄膜的可变光学性质。这种应力诱导的晶体各向异性随着四极性的增加，其与未经训练的立方ZnS薄膜的薄膜不同。借助使用干涉条纹的包络方法估计薄膜的折射率。结果，通过用所得的压缩应力施加拉伸驱动的菌株观察折射率和光带间隙的减少。通过采用单振荡器模型进一步研究调制折射率及其分散行为，以驱动随后的相关参数，例如色散能量，振荡强度和高频介电常数。作为概念证据，ZnS的光学透镜被设计为通过用应力检测可变焦距来确认原位应力介导的光学调制的效果。

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