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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Tuning Photoluminescence of Ge/GeO2 Core/Shell Nanoparticles by Strain
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Tuning Photoluminescence of Ge/GeO2 Core/Shell Nanoparticles by Strain

机译：通过应变调谐Ge / GeO2核/壳纳米粒子的光致发光

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摘要

The distribution of strain field plays an important role in deciding the physical properties of nanocrystals. The growth strain of Ge/GeO2 core/shell nanoparticles embedded in a regular array of Al2O3 nanoparticles and its resulting effect on the optical properties are investigated. Two-dimensional finite element calculations clearly demonstrate that Ge/GeO2 nanoparticles certainly experienced greater compressive strain in Al2O3 nanoparticles than in Al2O3 thin film, especially at the GeO2 shell area. This may lead to much more strain-relaxing defects produced at the GeO2 shell in Al2O3 nanoparticles. Meanwhile, the photogenerated excitons/ electron-hole pairs are localized by defects located at the GeO2 shell and are forced to recombine while being spatially confined in the Al2O3 nanoparticles. These effects might contribute to the observed intensity enhancement and blue shift of the photoluminescence peaks for the sample with Ge/GeO2 core/shell nanoparticles embedded in Al2O3 nanoparticles. The findings presented here provide physical insight and offer useful guidelines to controllably modify the optical properties of semiconductor nanoparticles through strain engineering.
机译：应变场的分布在决定纳米晶体的物理性质方面起着重要作用。研究了嵌入规则的Al2O3纳米颗粒阵列中的Ge / GeO2核/壳纳米颗粒的生长应变及其对光学性能的影响。二维有限元计算清楚地表明，Ge / GeO2纳米颗粒在Al2O3纳米颗粒中肯定比在Al2O3薄膜中经历更大的压缩应变，尤其是在GeO2壳区域。这可能会导致在Al2O3纳米颗粒的GeO2壳层处产生更多的松弛应变缺陷。同时，光生激子/电子-空穴对被位于GeO2壳层的缺陷所局限，并被迫重新结合，同时被空间限制在Al2O3纳米颗粒中。这些效应可能有助于观察到的强度增强和Ge / GeO2核/壳纳米粒子嵌入Al2O3纳米粒子的样品的光致发光峰的蓝移。此处提出的发现提供了物理见解，并提供了有用的指南，以通过应变工程可控地修改半导体纳米粒子的光学特性。

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