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A strain-induced exciton transition energy shift in CdSe nanoplatelets: the impact of an organic ligand shell
Nanoscale ( IF 5.8 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7nr05065h A. Antanovich 1, 2, 3 , A. W. Achtstein 4, 5, 6, 7 , A. Matsukovich 3, 8, 9, 10 , A. Prudnikau 1, 2, 3 , P. Bhaskar 11, 12, 13, 14 , V. Gurin 1, 2, 3 , M. Molinari 15, 16, 17, 18 , M. Artemyev 1, 2, 3
Nanoscale ( IF 5.8 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7nr05065h A. Antanovich 1, 2, 3 , A. W. Achtstein 4, 5, 6, 7 , A. Matsukovich 3, 8, 9, 10 , A. Prudnikau 1, 2, 3 , P. Bhaskar 11, 12, 13, 14 , V. Gurin 1, 2, 3 , M. Molinari 15, 16, 17, 18 , M. Artemyev 1, 2, 3
Affiliation
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We study the influence of surface passivating ligands on the optical and structural properties of zinc blende CdSe nanoplatelets. Ligand exchange of native oleic acid with aliphatic thiol or phosphonic acid on the surface of nanoplatelets results in a large shift of exciton transition energy for up to 240 meV. Ligand exchange also leads to structural changes (strain) in the nanoplatelet's core analysed by wide-angle X-ray diffraction. By correlating the experimental data with theoretical calculations we demonstrate that the exciton energy shift is mainly caused by the ligand-induced anisotropic transformation of the crystalline structure altering the well width of the CdSe core. Further the exciton reduced mass in these CdSe quantum wells is determined by a new method and this agrees well with the expected values substantiating that ligand-strain induced changes in the colloidal quantum well thickness are responsible for the observed spectral shifts. Our findings are important for theoretical modeling of other anisotropically strained systems and demonstrate an approach to tune the optical properties of 2D semiconductor nanocrystals over a broad region thus widening the range of possible applications of AIIBVI nanoplatelets in optics and optoelectronics.
中文翻译：
CdSe纳米血小板中的应变诱导的激子跃迁能量转移：有机配体壳的影响
我们研究了表面钝化配体对掺锌CdSe纳米片的光学和结构性质的影响。天然油酸与纳米片表面上的脂肪族硫醇或膦酸的配体交换导致激子跃迁能发生大位移，最高可达240 meV。通过广角X射线衍射分析，配体交换还导致纳米血小板核心的结构变化（应变）。通过将实验数据与理论计算相关联，我们证明了激子能量移动主要是由配体诱导的晶体结构的各向异性转变（改变了CdSe核的阱宽）引起的。此外，通过一种新方法确定了这些CdSe量子阱中激子减少的质量，这与预期值相符，该预期值证实了配体-应变诱导的胶体量子阱厚度变化是观察到的光谱偏移的原因。我们的发现对于其他各向异性应变系统的理论建模非常重要，并证明了一种可在较宽的区域内调节2D半导体纳米晶体光学特性的方法，从而扩大了A的可能应用范围光学和光电子学中的II B VI纳米片。
更新日期：2017-11-23
中文翻译：
CdSe纳米血小板中的应变诱导的激子跃迁能量转移：有机配体壳的影响
我们研究了表面钝化配体对掺锌CdSe纳米片的光学和结构性质的影响。天然油酸与纳米片表面上的脂肪族硫醇或膦酸的配体交换导致激子跃迁能发生大位移，最高可达240 meV。通过广角X射线衍射分析，配体交换还导致纳米血小板核心的结构变化（应变）。通过将实验数据与理论计算相关联，我们证明了激子能量移动主要是由配体诱导的晶体结构的各向异性转变（改变了CdSe核的阱宽）引起的。此外，通过一种新方法确定了这些CdSe量子阱中激子减少的质量，这与预期值相符，该预期值证实了配体-应变诱导的胶体量子阱厚度变化是观察到的光谱偏移的原因。我们的发现对于其他各向异性应变系统的理论建模非常重要，并证明了一种可在较宽的区域内调节2D半导体纳米晶体光学特性的方法，从而扩大了A的可能应用范围光学和光电子学中的II B VI纳米片。
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