Berlin 2018 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 18: Perovskite and Hybrid Photovolatics
HL 18.3: Talk
Tuesday, March 13, 2018, 10:00–10:15, EW 203
Ultrafast dynamics in quadrupole cationmixed halide perovskites — •Kestutis Budzinauskas1, Elina Patsikatheodorou1, Senol Oez2, Sanjay Mathur2, and Paul H.M. van Loosdrecht1 — 1II physikalisches Institut, Zuelpicher 77, Köln — 2Institut für Anorganische Chemie, Greinstr. 6, Köln
Hybrid perovskites are currently one of the most promising classes of materials for alternative solar cell technologies. Apart from the high power conversion efficiency which can be reached with these materials, one can also easily tune their optoelectronic properties by chemical substitutions. The quadrupole cation mixed halide perovskite Gu1.4Cs4.3MA13.2FA72.9Pb(I1−xBrx)3 is stable at room temperature and allows tuning of the optical absorption spectrum via the Br:I ratio. Nevertheless little is known about the initial steps of the charge generation process. To obtain a better insight in the charge generation and exciton dynamics in this material we performed transient absorption spectroscopy experiments. Our pump-probe experiments show a pronounced pump energy dependence of the response near the optical band-gap. These results are discussed in terms of exciton diffusion and local structural variations