Impact of solvent vapor annealing on the morphology and photophysics of molecular semiconductor thin films

Article Abstract:

The effect of solvent vapor annealing on the fluorescence characteristics and morphology of titanyl phthalocyanine/perylene phenethylimide thin-film molecular semiconductor bilayers (TiOPc/PPEI) was investigated using atomic force microscopy in combination with near-field scanning optical microscopy, bulk absorption and fluorescence measurements. Experimental results showed that treatment of the vacuum-deposited amorphous PPEI and TiOPc/PPEI films leads to the crystalline transformation of these materials and strongly modifies the contact between the TiOPc and PPEI layers. Extended annealing causes a decrease in charge transfer quenching efficiencies.

Organic semiconductors, Thin films, Optical properties, Annealing

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Molecular dynamics simulations in aqueous solution: application to free energy calculation of oligopeptides

Article Abstract:

A study was conducted to characterize a technique for determining thermodynamic parameters with the Poisson-Boltzmann equation and molecular dynamics computations. The method characterizes the solvent effect on the solute conformation as a potential of mean force. Experimental results indicated the consistency of the method with the explicit water framework. Findings also showed that the electrostatic screening effect plays a critical function in the solvent effect.

Thermodynamics, Oligopeptides

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Solvent-controlled theory analysis of chirped pulse excitation of molecules in solutions

Article Abstract:

A simple and physically clear approach to the interaction of intense chirped pulses with large molecules in solutions is developed: time dependent rate equations for integral populations of electronic molecular states. The time-dependent transition rates differ from those of the solvent-controlled theory not only by the time dependence of the transition rates and the activation energies.

Science & research

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