Instituto de Energía Solar, E.T.S.I. Telecomunicación, Universidad Politécnica de Madrid, Avenida Complutense 30, E-28040 Madrid, Spain.
Nanotechnology. 2013 Aug 30;24(34):345402. doi: 10.1088/0957-4484/24/34/345402.
A colloidal deposition technique is presented to construct long-range ordered hybrid arrays of self-assembled quantum dots and metal nanoparticles. Quantum dots are promising for novel opto-electronic devices but, in most cases, their optical transitions of interest lack sufficient light absorption to provide a significant impact in their implementation. A potential solution is to couple the dots with localized plasmons in metal nanoparticles. The extreme confinement of light in the near-field produced by the nanoparticles can potentially boost the absorption in the quantum dots by up to two orders of magnitude.In this work, light extinction measurements are employed to probe the plasmon resonance of spherical gold nanoparticles in lead sulfide colloidal quantum dots and amorphous silicon thin-films. Mie theory computations are used to analyze the experimental results and determine the absorption enhancement that can be generated by the highly intense near-field produced in the vicinity of the gold nanoparticles at their surface plasmon resonance.The results presented here are of interest for the development of plasmon-enhanced colloidal nanostructured photovoltaic materials, such as colloidal quantum dot intermediate-band solar cells.
提出了一种胶态沉积技术，用于构建自组装量子点和金属纳米粒子的长程有序杂化阵列。量子点在新型光电设备中具有广阔的应用前景，但在大多数情况下，其感兴趣的光学跃迁缺乏足够的光吸收，无法在其应用中产生显著的影响。一种潜在的解决方案是将量子点与金属纳米粒子中的局域等离子体耦合。纳米粒子产生的近场中光的极端限制有可能将量子点的吸收提高两个数量级。在这项工作中，采用光消光测量来探测硫化铅胶体量子点和非晶硅薄膜中球形金纳米粒子的等离子体共振。使用 Mie 理论计算来分析实验结果，并确定在金纳米粒子表面等离子体共振附近由高强度近场产生的吸收增强。这里呈现的结果对于开发等离子体增强胶体纳米结构光伏材料具有重要意义，例如胶体量子点中间带太阳能电池。
