1 Yu, G.,Gao, J., Hummelen, J. C., Wudl, F. & Heeger, A. J. Polymer photovoltaic cells: enhanced efficiencies via a network of internal donor-acceptor heterojunctions. Science 270, 1789–1791 (1995). 2 Saraciftci, N. S., Smilowitz, L., Heeger, A. J.&Wudl, F. Photoinduced electron transfer froma conducting polymer to buckminsterfullerene. Science 258, 1474–1476 (1992). 小弟只能下1997之后的 ,拜托各位高人拉 谢谢