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Discriminating bulk, surface and interface aging effects in polymer-based active materials for efficient photovoltaic devices

2010; Elsevier BV; Volume: 494; Issue: 1-3 Linguagem: Inglês

10.1016/j.cplett.2010.05.076

1873-4448

Barbara Paci, Amanda Generosi, Daniele Bailo, V. Rossi Albertini, R. de Bettignies,

Thin-Film Transistor Technologies

Abstract The present study, reporting time-resolved investigations of polymer-based films for plastic photovoltaics, particularly focuses on aging related to the devices interface properties. The unconventional approach used is based on an in situ cross-monitoring of the films structural/morphological properties. For this propose, Energy Dispersive X-ray Reflectivity and Diffraction techniques were used in synergy with atomic force microscopy analysis. In this way, the meso-scale modifications of the organic film bulk, surface and buried interface with the electrode, were observed directly. As a result of such non-destructive characterization, access to the concomitant chemical–physical processes, occurring to the cell active component during illumination and related to degradation and reliability issues, is gained.