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We conducted a comprehensive Kelvin probe force microscopy (KPFM) study of the ''classical'' organic solar cell system consisting of the MDMO-PPV:PCBM blend. The KPFM method yields detailed information of topography and local work function on the nanometer scale. Experiments were performed either in the dark or under laser illumination to extract locally resolved surface photovoltage. We identified distinct differences in energetics on the surface of chlorobenzene-and toluenecast blend films. The electronic and structural behavior of the toluene-cast blend films were analyzed in relation to illumination and substrate temperature. Together with previous studies we were able to interpret the KPFM results and draw some conclusions regarding the correlation between the nanostructural properties and photovoltaic performance of organic solar cells.

A self-assembled monolayer of 1-octanethiol was prepared on a Au(111) surface via liquid-phase adsorption. An investigation of the surface using ultrahigh-vacuum scanning tunneling microscopy revealed a striped phase of the octanethiol molecules under the conditions examined. This phase resembles the well-known "pinstripe" structure of alkanethiols on Au(111), with a registry that is similar to that of the previously observed p x radical3 structures. We discuss the nature of this structure with respect to those that have been observed for other n-alkanethiols.

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