Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 71: Organic Electronics and Photovoltaics - OLEDs and Molecular Excitations
CPP 71.9: Vortrag
Donnerstag, 15. März 2018, 17:15–17:30, C 243
Excited States Dynamics in TIPS-Pentacene Studied with Femtosecond Time-Resolved Second Harmonic Generation — •Vipilan Sivanesan1, Silke Koser2, Uwe Bunz2, and Petra Tegeder1 — 1Universität Heidelberg, Physikalisch-Chemisches Institut — 2Universität Heidelberg, Organisch-Chemisches Institut
Understanding the ultrafast excited state dynamics in organic semiconductors after optical excitation is a key requisite on the road towards the design of efficient organic solar cells (OPV). Recently, the singlet fission process has gained much attention since it may improve the energy conversion efficiency in OPVs. In this work we monitored the ultrafast (sub-picosecond) excited states dynamics in TIPS-Pentacene (TIPS-Pn) using time-resolved second harmonic generation (TR-SHG). Sapphire was used as non-interacting substrate to analyse the dynamics of excitonic species in TIPS-Pn films. Thereby the dynamics of singlet fission process could be resolved. The process consists of the generation of singlet excitons localized on a single molecule followed by the fission into two triplet excitons on two TIPS-Pn molecules. While the overall singlet fission process occurred within 200fs, we could also resolve the transfer from the singlet exciton state to the mediating multiexciton state.