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Increased salt concentration promotes competitive block of OmpF channel by protons
(Elsevier, 2012-11)
Porins are channel-forming proteins that are located in the outer membranes (OM) of Gram-negative bacteria
and allow the influx of hydrophilic nutrients and the extrusion of waste products. The fine regulation of the
ion ...
Simultaneous broadband microwave downconversion and programmable complex filtering by optical frequency comb shaping
(Optical Society of America, 2012)
High-repetition-rate optical frequency combs can act as broadband photonic mixers and downconvert a microwave signal to an intermediate frequency (IF) band so that it becomes accessible with high-speed electronics. In this ...
How the Charge-Neutrality Level of Interface States Controls Energy Level Alignment in Cathode Contacts of Organic Bulk-Heterojunction Solar Cells
(American Chemical Society, 2012-04)
Electronic equilibration at the metal–organic interface, leading to equalization of the Fermi levels, is a key process in organic optoelectronic devices. How the energy levels are set across the interface determines carrier ...
Recombination in Organic Bulk Heterojunction Solar Cells: Small Dependence of Interfacial Charge Transfer Kinetics on Fullerene Affinity
(American Chemical Society, 2012)
We investigate the causes for obtaining higher open-circuit voltage in solar cells that use a fullerene with a smaller electron affinity. Using impedance spectroscopy technique, we show that the change of fullerene LUMO ...
Ionic conductivity and diffusion coefficients of lithium salt polymer electrolytes measured with dielectric spectroscopy
(Elsevier, 2011)
Ionic conductivity, diffusion coefficients, mobility and ionic concentration for lithium salts dissolved in polymer electrolytes are determined by the modeling of the dielectric loss and spectra. Cation and anion diffusion ...
Characterization of nanostructured hybrid and organic solar cells by impedance spectroscopy
(RSC Publishing, 2011-04-06)
We review the application of impedance spectroscopy in dye-sensitized solar cells, quantum dot-sensitized solar cells and organic bulk heterojunction solar cells. We emphasize the interpretation of the impedance parameters ...
Assessing possibilities and limits for solar cells
(Wiley, 2011-05-05)
What are the solar cell efficiencies that we can strive towards? We show here that several simple criteria, based on cell and module performance data, serve to evaluate and compare all types of today's solar cells. Analyzing ...
Current-voltage characteristics of bulk heterojunction organic solar cells: connection between light and dark curves
(Wiley, 2011-11)
A connection is established between recombination and series resistances extracted from impedance spectroscopy and current-voltage curves of polythiophene:fullerene organic solar cells. Recombination is shown to depend ...
Insights on the permeability of wide protein channels: measurement and interpretation of ion selectivity
(Royal Society of Chemistry, 2012-10-11)
Ion channels are hollow proteins that have evolved to exhibit discrimination between charged solutes. This property, known as ion selectivity is critical for several biological functions. By using the bacterial porin OmpF ...
Operating modes of sandwiched light-emitting electrochemical cells
(Wiley, 2011-03-14)
Light-emitting electrochemical cells (LECs) are promising lighting devices in which the redistribution of ionic charges allows for double electronic carrier injection from air-stable electrodes. Uncertainties about the ...