Role of Energy Transfer in Conversion of Light to Electric Energy

The role of nonradiative inductive-resonance energy transfer between molecules of Coumarine-7 and rhodamine dyes in the conversion of light into electric energy is studied. It is ascertained that the co-sensitization of a TiO₂ solar cell by donor and acceptor molecules leads to an increase of the efficiency of conversion of light to energy. The measurements show that it is due to a widening of the photosensitivity of a cell into the blue region of the spectrum. The increase of the total energy absorbed promotes increasing the number of generated charge carriers at the interface of TiO₂ and dyes.     

Triplet-triplet energy transfer in Langmuir-Blodgett films

The temperature effect on the efficiency of the triplet energy transfer between different molecules included in molecular layers by the Langmuir-Blodgett (LB) procedure was studied. The efficiency of the triplet energy transfer from the LB film of the donor to the LB film of the acceptor is determined by the homogeneous broadening of the energy donor levels.     

Effect of Copper Phthalocyanin Nanostructures on the Photovoltaic Characteristics of a Polymer Solar Cell

Russian Physics Journal - The results of studying the influence of copper phthalocyanine (CuPc) nanostructures on the generation and transfer of charge carriers in the semiconductor polymer...     

Effect of formulas of titanoxide compositions on the photovoltaic characteristics of solar cells

The effect the chemical composition of semiconductor titanium compositions (titanium pastes) has on the photovoltaic characteristics of dye-sensitized solar cells is investigated. It is established that the efficiency of solar energy conversion by a photovoltaic cell made with Ti-nanooxide D paste is 5.3%, while that of one made with Degussa P25 paste is 4.7%. These data correlate with the specific surface and sorption ability of semiconductor films.     

Effect of Silver and Gold Nanoparticles on the Spectral and Luminescent Properties of a Merocyanine Dye

Theoretical and Experimental Chemistry - An increase in the concentration of silver nanoparticles (NP) initially causes an increase and then a decrease in the absorption and fluorescence...     

Interlayer triplet-triplet energy transfer in nanosized molecular layers

The results of the study of interlayer triplet-triplet energy transfer from anthracene molecules to Nile Red molecules in Langmuir-Blodgett films are presented. The observed sensitized delayed fluorescence of the energy acceptor is shown to be due to annihilation of migrating triplet excitons. It has been found that the decay kinetics of delayed fluorescence of the donor and the acceptor has a complex form and is described by a combination of the power and exponential functions. The dependence of the energy transfer efficiency on the distance between the donor and acceptor layers was studied.     

Kinetics of photoreactions with participation of molecular oxygen in Langmuir-Blodgett films

The influence of molecular oxygen on the luminescence of organic molecules (dyes and aromatic hydrocarbons) in Langmuir-Blodgett films is studied. Experimental luminescence kinetics curves are compared with theoretical curves calculated in terms of different mathematical models. It is shown that the best agreement with experiment is achieved using a model that takes into account the frontal diffusion of excited oxygen molecules to the interphase surface.     

The influence of silver nanoparticles on the stimulated luminescence of rhodamine 6G solutions

The influence of silver nanoparticles on the spontaneous and stimulated luminescence of rhodamine 6G molecules in aqueous solutions is studied. It is found that the laser photoexcitation of the dye solution gives rise to spontaneous fluorescence, which, with increasing pump power, transforms into stimulated laser radiation and superluminescence. Addition of silver nanoparticles to rhodamine 6G solutions enhances all types of luminescence and lowers the generation threshold for both types of the stimulated emission. The dependences of the laser radiation and superluminescence intensities on the concentration of silver nanoparticles correlate with the data on the spontaneous fluorescence.