Ultrafast decoherence dynamics govern photocarrier generation efficiencies in polymer solar cells.

ABSTRACT: All-organic-based photovoltaic solar cells have attracted considerable attention because of their low-cost processing and short energy payback time. In such systems the primary dissociation of an optical excitation into a pair of photocarriers has been recently shown to be extremely rapid and efficient, but the physical reason for this remains unclear. Here, two-dimensional photocurrent excitation spectroscopy, a novel non-linear optical spectroscopy, is used to probe the ultrafast coherent decay of photoexcitations into charge-producing states in a polymer:fullerene based solar cell. The two-dimensional photocurrent spectra are interpreted by introducing a theoretical model for the description of the coupling of the electronic states of the system to an external environment and to the app

SUBMITTER: Vella E 

PROVIDER: S-EPMC4944175 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature