By courtesy of:
G. Yu, J. Gao, J. C. Hummelen, F. Wudl, A. J. Heeger
Science 1995, 270, 1789
and earlier the same year on Nature by Friend et al. about all-polymer D-A heterojunctions for photovaltaic cells:
Efficient Photodiodes from Interpenetrating Polymer Networks
J. J. M. Halls, C. A. Walsh, N. C. Greenham, E. A. Marsegila, R. H. Friend, S. C. Morrati & A. B. Holmes
Nature 1995, 376, 498
and the first paper about photovoltaic cells by conducting polymer and fullerene:
Photoinduced Electron Transfer from a Conducting Polymer to Buckminsterfullerene
N.S. Sariciftci, L. Smilowitz, A.J. Heeger, F. Wudl
Science 1992, 258, 1474
and the first paper in this field starting from small molecules:
Two-layer organic photovoltaic cell
C. W. Tang
Appl. Phys. Lett. 1986, 48, 183
and two recent papers:
Efficient Solar Cells Using All-Organic Nanocrystalline Networks
Fan Yang, Kai Sun, and Stephen R. Forrest*
Adv. Mater. 2007, 19, 4166
High Photovoltaic Performance of Inkjet Printed Polymer:Fullerene Blends
Claudia N. Hoth, Stelios A. Choulis,* Pavel Schilinsky, and Christoph J. Brabec
Adv. Mater. 2007, 19, 3973