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Efficiency enhancement of P3HT:PCBM solar cells containing scattering Zn-Al hydrotalcite nanoparticles in the PEDOT:PSS layer

100%
Bolognesi M., Tessarolo M., Posati T., Nocchetti M., Benfenati V., Seri M., Ruani G., Muccini M.
Organic Photonics and Photovoltaics
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2013
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vol. 1
1-10
EN
In this article we report on a new hybrid (organic-inorganic) composite material based on hydrophilic, electrically inert and semi-transparent hydrotalcite (HT) nanoparticles and a pHneutral formulation of PEDOT:PSS. The application of this composite material as electrically and optically active buffer layer in P3HT:PC61BM bulk heterojunction (BHJ) solar cells is reported. Two different synthetic routes are explored to obtain HTs having discoid shape, with a diameter of around 150- 200 nm and a thickness of ~20 nm, to be easily embedded in ~50 nm thick PEDOT:PSS films. The good affinity between HTs and the sulfonate groups of the PEDOT:PSS allows to obtain homogeneous HTs/PEDOT:PSS films, for HT concentrations of 0.25% and 0.50% by weight (vs. PEDOT:PSS). At these particle loads the electrical and morphological features of doped and undoped PEDOT:PSS films are nearly identical, while providing a significant effect on the visible light scattering properties of the composite films. We demonstrate ~12% improvement in power conversion efficiency (PCE) for P3HT:PC61BM solar cells incorporating HTs in the PEDOT: PSS layer, which mainly originates from increased shortcircuit current densities (JSC).
2
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Insight into the kinetics and the mode of the interaction between smooth muscle calponin and F-actin.

100%
Kołakowski J., Dąbrowska R.
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vol. 49
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issue 2
471-479
EN
Kinetics of the smooth muscle calponin-F-actin interaction was studied by stopped- flow measurements of light scattering and fluorescence intensity of pyrene-labelled F-actin. The intensity and character of the changes in light scattering, and thus the mode of calponin binding to actin filaments leading to changes in their shape and bundling, depend on the molar ratio of the two proteins. Parallel measurements of pyrene-fluorescence quenching upon calponin binding revealed that intrinsic conformational changes in actin filaments are delayed relative to the binding process and are not markedly influenced by the mode of calponin binding. Bundling of actin filaments by calponin was not correlated with fluorescence changes and thus with alterations in the structure of actin filaments.
3
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Using the DDA (Discrete Dipole Approximation) Method in Determining the Extinction Cross Section of Black Carbon

100%
Skorupski K.
Metrology and Measurement Systems
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2015
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vol. 22
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issue 1
4
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Algorithms and methods for analysis of the optical structure factor of fractal aggregates

86%
Mroczka J., Woźniak M., Onofri F. R. A.
Metrology and Measurement Systems
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2012
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issue 3
5
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Holographic grating recording in azobenzene functionalized polymers

86%
Sobolewska A., Miniewicz A., Grabiec E., Sek D.
Open Chemistry
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2006
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vol. 4
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issue 2
266-284
EN
A group of 22 polymers have been synthesized to test their suitability for recording holographic gratings. Polyamides, polyimides, polyesters and their combinations were functionalized with pendant azobenzene groups containing single or double N=N. The polymers were studied using a standard degenerate two-wave mixing technique, which enables measurement of light-induced periodic modification of polymer refractive index and absorption coefficient by analysis of the diffracted light. Two qualitatively different configurations of the holographic polarization recording were used, s-s and s-p. The relationship between structural properties of polymer matrix and azobenzene groups and the holographic grating recording kinetics and light diffraction efficiency was investigated.
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