Sygletou Maria, Benedetti Stefania, di Bona Alessandro, Canepa Maurizio, Bisio Francesco
OptMatLab, Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146 Genova, Italy.
CNR-Istituto Nanoscienze, via Campi 213/a, 41125 Modena, Italy.
J Phys Chem C Nanomater Interfaces. 2022 Feb 3;126(4):1881-1889. doi: 10.1021/acs.jpcc.1c07567. Epub 2022 Jan 25.
Understanding the interaction between plasmonic nanoparticles and transparent conductive oxides is instrumental to the development of next-generation photovoltaic, optoelectronic, and energy-efficient solid-state lighting devices. We investigated the optical response of hybrid media composed of gold nanoparticles deposited on aluminum-doped zinc oxide thin films with varying doping concentration by spectroscopic ellipsometry. The dielectric functions of bare AZO were addressed first, revealing doping-induced effects such as the band gap shift and the appearance of free carriers. In the hybrid media, a blue-shift of the localized surface plasmon resonance of Au NPs as a function of increasing Al doping of the substrate was observed, ascribed to the occurrence of a charge transfer between the two materials and the doping-dependent variation of the polarizability of the substrate.
了解等离子体纳米颗粒与透明导电氧化物之间的相互作用对于下一代光伏、光电子和节能固态照明设备的发展至关重要。我们通过光谱椭偏仪研究了由沉积在不同掺杂浓度的铝掺杂氧化锌薄膜上的金纳米颗粒组成的混合介质的光学响应。首先研究了裸AZO的介电函数，揭示了掺杂引起的效应，如带隙移动和自由载流子的出现。在混合介质中，观察到金纳米颗粒的局域表面等离子体共振随着衬底铝掺杂量的增加而发生蓝移，这归因于两种材料之间发生的电荷转移以及衬底极化率的掺杂依赖性变化。
