Berlin 2015 – wissenschaftliches Programm
TT 47.3: Vortrag
Dienstag, 17. März 2015, 14:45–15:00, C 130
Charge separation at C60/P3HT and P3HT/ZnO interfaces probed by femtosecond time-resolved second harmonic generation measurements — •Marc Hänsel1, Michael Schulze1, Yunus Sevinchan2, Yana Vaynzof2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut, Heidelberg, Germany — 2Centre of Advanced Materials, Heidelberg, Germany
A deeper understanding of the process of ultrafast charge transfer and separation at donor/acceptor interfaces is a prerequisite for improvement of organic and hybrid solar cells. Time-resolved second harmonic generation (TR-SHG) with femtosecond temporal resolution was used to investigate different donor/acceptor interfaces. With this intrinsically interface sensitive technique we were able to monitor the charge transfer dynamics of the well-defined single heterojunctions C60/P3HT and P3HT/ZnO. In addition some modifications via cesium doping were made to the ZnO/P3HT interface. At the C60/P3HT interface a pump energy dependent ultrafast charge transfer state with a population time of 320fs has been observed.