1. Bach, U. et al. Nature 395, 583–585 (1998).
2. Wöhrle, D. et al. J. Mater. Chem. 5, 1818–1829 (1995).
3. Yu, G., Gao, J., Hummelen, J. C., Wudl, F. & Heeger, A. J. Science 270, 1789–1791 (1995).
4. O'regan, B. & Grätzel, M. Nature 353, 737-739 (1991).
5. Green, M. A., Emery, K., Bücher, K., King, D. L. & Igari, S. Prog. Photovoltaics: Res. Appl. 6, 35–42 (1998).