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MM: Fachverband Metall- und Materialphysik

MM 34: Poster Session

MM 34.33: Poster

Tuesday, April 1, 2014, 18:00–20:00, P4

Accessing the excitation and relaxation pathways in the ultrafast Carrier dynamics of BaSnO₃:La perovskite — •Kestutis Budzinauskas¹, Rolf Versteeg¹, Matteo Montagnese¹, Xuan Luo², Sang W. Cheong^2,3, and Paul H.M. Van Loosdrecht¹ — ¹II Physikalisches Institut,University of Cologne, Cologne, Germany — ²Laboratory of Pohang Emergent Materials and Department of Physics, Pohang, Korea — ³Rutgers Center for Emergent Materials and Department of Physics and Astronomy, New Jersey, USA

The Lanthanum doped Barium tin oxide BaSnO₃:La is a transparent conducting oxide (TCO). Unlike other perovskites It shows an extremely high electron mobility, reaching values up to 320 cm² V⁻¹ s⁻¹ at room temperature, making it a promising alternative to other more expensive or unstable TCO’s for applications.
The microscopic mechanisms leading to such high and uncharacteristic electron mean free paths are not fully understood. We have studied the non-equilibrium carrier dynamics in the material employing ultra-fast time-resolved spectroscopy in the visible, near Infrared and THz range of the optical spectrum. In this way we are able to track and elucidate the different carrier excitation and relaxation pathways in this intriguing compound.