Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Organic electronics and photovoltaics: OPV I (CPP with HL/TT)

HL 36.3: 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.