Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Focus: Fundamental Physics of Perovskites I - organized by Lukas Schmidt-Mende and Vladimir Dyakonov
CPP 48.8: Vortrag
Mittwoch, 14. März 2018, 17:15–17:30, C 130
Tunable Anisotropic Photon Emission from Self-Organized CsPbBr3 Perovskite Nanocrystals — •Thomas Morgenstern1, Matthew J. Jurow2, Erika Penzo2, Jun Kang2, Matthew A. Koc3, Thomas Zechel1, Zachary Nett2, Michael Brady2, Lin-Wang Wang2, A.Paul Alivisatos2, 3,4, Stefano Cabrini2, Yi Liu2, and Wolfgang Brütting1 — 1Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States — 3College of Chemistry, University of California, Berkeley, California 94720, United States — 4Kavli Energy NanoScience Institute, Berkeley, California 94720, United States
The introduction of preferentially aligned transition dipole moment vectors (TDMVs) is a common concept in the field of organig light emitting diodes. However, in the literature of perovskites and especially CsPbBr3 nanocrystals this effect has rarely been reported.
In this work the anisotropy factor, correlating to the alignment of the transition dipoles within the nanocubes, for several CsPbBr3 nanocrystal systems has been determined. [1] The results indicate a preferential alignment in vertical direction to the underlying surface. Using theoretical predictions the observed effect can be attributed to a charge redistribution originating from the contact of the nanocrystal to its underlying surface. Thus, a suitable choice of the substrate material can be used to further control the anisotropic emission properties, giving further potential to improve emission properties for light emitting devices. [1] M. Jurow, et. al.: Nano Lett. 17(7) (2017), 4534-4540