Tunable Surface Plasmon Resonances Based on Chromium Disk Array Containing Liquid Crystals

Shyu, J. H.; Lin, Yu-Chi; Lee, Huang-Ming; Hsieh, Chia−Ting; Huang, Chi Yen; Wu, Jong-Ching

doi:10.7567/jjap.50.09mg03

Cited by 1 publication

(1 citation statement)

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“…It is known that the surface plasmon resonance energy of metallic NPs will shift depending on the dielectric properties of the surrounding medium. This phenomenon has been observed by several groups − and can be rationalized with effective medium approximations. − Figure shows the absorbance spectra of the Ag NPs with different Al 2 O 3 thicknesses (0.2, 0.8, 2, 3, 8, 15, 30 nm). Bare Ag NPs prepared on an ITO/glass substrate have a surface plasmon peak at 448 nm.…”

Section: Resultssupporting

confidence: 58%

Optimal Shell Thickness of Metal@Insulator Nanoparticles for Net Enhancement of Photogenerated Polarons in P3HT Films

Goh

Williams

Yang

et al. 2016

ACS Appl. Mater. Interfaces

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Embedding metal nanoparticles in the active layer of organic solar cells has been explored as a route for improving charge carrier generation, with localized field enhancement as a proposed mechanism. However, embedded metal nanoparticles can also act as charge recombination sites. To suppress such recombination, the metal nanoparticles are commonly coated with a thin insulating shell. At the same time, this insulating shell limits the extent that the localized enhanced electric field influences charge generation in the organic medium. It is presumed that there is an optimal thickness which maximizes field enhancement effects while suppressing recombination. Atomic Layer Deposition (ALD) was used to deposit Al2O3 layers of different thicknesses onto silver nanoparticles (Ag NPs), in a thin film of P3HT. Photoinduced absorption (PIA) spectroscopy was used to study the dependence of the photogenerated P3HT(+) polaron population on the Al2O3 thickness. The optimal thickness was found to be 3-5 nm. This knowledge can be further applied in the design of metal nanoparticle-enhanced solar cells.

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