Dresden 2017 – wissenschaftliches Programm
CPP 8.5: Hauptvortrag
Montag, 20. März 2017, 16:45–17:15, ZEU 222
Ultrafast transient absorption spectroscopy of organic-inorganic hybrid perovskites on mesoporous titanium dioxide in contact with hole transport materials — •Thomas Lenzer — Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076 Siegen
Organic-inorganic hybrid perovskites, such as methylammonium lead iodide, are particularly promising for applications in solar light harvesting and optoelectronics. We present our recent results on the carrier dynamics of such materials using ultrafast pump - supercontinuum probe spectroscopy in the 260-1600 nm range. The perovskite systems are investigated over a wide range of carrier densities. Slow carrier recombination processes, "phonon bottlenecks" during carrier cooling and confinement effects in low-dimensional perovskite structures are identified. We investigate electron injection processes from the perovskite into the mesoporous titania scaffold and estimate the relative contributions of electron transport pathways in the perovskite and titanium dioxide. We also discuss the hole transfer from the perovskite into triarylamine-based hole transport materials (HTMs).