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Efficiency estimations of organic solar cells are observed to be dependent on the dimensions of electrode defining the active area. We address this issue and explore the manner in which efficiency scales in polymer solar cells by studying these devices as a function of electrode area and incident beam size. The increase in efficiency for smaller active areas can be explained by the reduced electrical resistive loss, the enhanced optical effects, and the finite additional fraction of photogenerated carriers in the vicinity of the perimeter defined by the metal electrode [ABSTRACT FROM AUTHOR]

Interfacial barriers at the metal-semiconductor junction manifest in the form of sizable contact resistance in polymer field effect transistors (PFETs). We study the barrier using optical excitation directed specifically beneath the electrodes in the top-contact PFETs without optically perturbing the channel. Differences in the transconductance responses with the light localized at the source and the drain electrode region provides a considerable insight into the injection barriers. [ABSTRACT FROM AUTHOR]

We demonstrate electric-field-induced spreading of drops, composed of conducting polymer blend in an aqueous dispersion, on a hydrophobic polymer surface in a confined microchannel geometry. The field-induced wetting characteristics results in a controlled formation of dried-narrow, strips of the conducting polymer. We discuss the formation of such conducting polymer films along with their electrical transport characteristics and potential applications in fabricating lithography-free structures. [ABSTRACT FROM AUTHOR]