Correlation Between Crystallinity and Solar-Cell Efficiency of the Low-Bandgap Polymer PDDTP (pages 1689–1694)
Joachim A. Renz, Raja Shahid Ashraf, Tobias Erb, Sviatoslav Shokhovets, Gerhard Gobsch, Elisabeth Klemm and Harald Hoppe
Article first published online: 8 JUL 2010 | DOI: 10.1002/macp.201000066
A novel low-bandgap conjugated polymer PDDTP has been synthesized and studied in polymer/fullerene bulk heterojunctions. Solar cells have been optimized according to their fullerene content and the active layer thickness. The photovoltaic performance is highly correlated with the crystallinity of the polymer as detected by grazing-incidence X-ray diffraction. The maximum power conversion efficiency coincides with a clear peak in the photocurrent generation.