Abstract
Understanding the interface physics is one of the most important challenges in organic photovoltaic devices. At the interface photons get absorbed and charge separation takes place. Common knowledge suggests that a cold process is occurring, i.e. following absorption, excess energy with respect to the optical gap is dissipated, competing with interfacial charge separation in the first tens of fs. The accepted scenario in efficient organic solar cells based on low band gap copolymers, suggests that at the interface both bound interfacial charge transfer states (CTS) and free polarons are generated in the first hundreds of fs. However, no experimental evidence has been presented elucidating the role of the excess energy and the actual charge generation mechanism on such a short timescale.
© 2013 IEEE
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