Origin of the Open Circuit Voltage of Plastic Solar Cells (pages 374–380)
C. J. Brabec, A. Cravino, D. Meissner, N. S. Sariciftci, T. Fromherz, M. T. Rispens, L. Sanchez and J. C. Hummelen
Version of Record online: 2 OCT 2001 | DOI: 10.1002/1616-3028(200110)11:5<374::AID-ADFM374>3.0.CO;2-W
A variation of almost 200 mV has been found for the first reduction potential of a series of highly soluble fullerene derivatives with varying acceptor strengths that were used as electron acceptors in plastic solar cells. This observation, which also relates the open circuit voltage to the acceptor strengths, is discussed within the concept of Fermi level pinning between fullerenes and metals. The Figure shows an azafulleroid that was used in this investigation.