Dr. Aleksandra A. Wronkowska Profile

Dr. Aleksandra A. Wronkowska

at Univ of Technology and Life Sciences in Bydgoszcz

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Publications (3)

Proceedings Article | 5 May 2015 Paper

Enhancement of light absorption in polyazomethines due to plasmon excitation on randomly distributed metal nanoparticles

P. Wróbel, T. Antosiewicz, T. Stefaniuk, A. Ciesielski, A. Iwan, A. Wronkowska, A. Wronkowski, T. Szoplik

Proceedings Volume 9502, 95020C (2015) https://doi.org/10.1117/12.2180252

KEYWORDS: Absorption, Aluminum, Polymers, Nanoparticles, Silver, Metals, Solar cells, Scattering, Refractive index, Finite-difference time-domain method

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In photovoltaic devices, metal nanoparticles embedded in a semiconductor layer allow the enhancement of solar-toelectric energy conversion efficiency due to enhanced light absorption via a prolonged optical path, enhanced electric fields near the metallic inclusions, direct injection of hot electrons, or local heating. Here we pursue the first two avenues. In the first, light scattered at an angle beyond the critical angle for reflection is coupled into the semiconductor layer and confined within such planar waveguide up to possible exciton generation. In the second, light is trapped by the excitation of localized surface plasmons on metal nanoparticles leading to enhanced near-field plasmon-exciton coupling at the peak of the plasmon resonance. We report on results of a numerical experiment on light absorption in polymer- (fullerene derivative) blends, using the 3D FDTD method, where exact optical parameters of the materials involved are taken from our recent measurements. In simulations we investigate light absorption in randomly distributed metal nanoparticles dispersed in polyazomethine-(fullerene derivative) blends, which serve as active layers in bulkheterojunction polymer solar cells. In the study Ag and Al nanoparticles of different diameters and fill factors are diffused in two air-stable aromatic polyazomethines with different chemical structures (abbreviated S9POF and S15POF) mixed with phenyl-C₆₁-butyric acid methyl ester (PCBM) or [6,6]-phenyl-C₇₁-butyric acid methyl ester (PC₇₁BM). The mixtures are spin coated on a 100 nm thick Al layer deposited on a fused silica substrate. Optical constants of the active layers are taken from spectroscopic ellipsometry and reflectance measurements using a rotating analyzer type ellipsometer with auto-retarder performed in the wavelength range from 225 nm to 2200 nm. The permittivities of Ag and Al particles of diameters from 20 to 60 nm are assumed to be equal to those measured on 100 to 200 nm thick metal films.

Proceedings Article | 2 May 2014 Paper

Permittivity, specific resistivity and surface roughness of silver nanolayers for plasmonic applications

T. Stefaniuk, P. Wróbel, A. Wronkowska, A. Wronkowski, P. Trautman, T. Szoplik

Proceedings Volume 9125, 912519 (2014) https://doi.org/10.1117/12.2058593

KEYWORDS: Silver, Silica, Germanium, Metals, Nickel, Surface roughness, Sapphire, Plasmonics, Refractive index, Scattering

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Proceedings Article | 25 October 2013 Paper

NIR-Vis-UV permittivity of nanoporous C-Pd thin films determined using spectroscopic ellipsometry

Aleksandra Wronkowska, Grażyna Czerniak, Andrzej Wronkowski, Elżbieta Czerwosz, Ewa Kowalska

Proceedings Volume 8903, 89030F (2013) https://doi.org/10.1117/12.2032241

KEYWORDS: Dielectrics, Palladium, Thin films, Carbon, Spectroscopic ellipsometry, Chemical vapor deposition, Nanoparticles, Optical properties, Nanocomposites, Data modeling

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