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HL: Fachverband Halbleiterphysik
HL 39: Quantum Dots and Wires 6: II-VI and related
HL 39.5: Vortrag
Freitag, 9. September 2022, 10:30–10:45, H32
Exciton recombination dynamics and polarization properties in CsPbI3 perovskite nanocrystals — •Gang Qiang1, Dmitri R. Yakovlev1,2, Elena V. Shornikova1, Danil O. Tolmachev1, Mikhail A. Prosnikov3, Elena V. Kolobkova4, Peter C. M. Christianen3, and Manfred Bayer1,2 — 1Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany — 2St. Petersburg, Russia — 3High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands — 4St. Petersburg, Russia
We synthesized CsPbI3 NCs in fluorophosphate glass matrix and investigated the optical properties at various temperatures down to 4.2 K and in external magnetic fields up to 30 T. Recombination dynamics demonstrate clearly two-exponential decay characteristic for exciton emission with the dark exciton as a ground state. An anomalous polarization properties is observed at low temperature (e.g. 4.2 K), i.e. with the increasing of magnetic field, the degree of circular polarization (DCP) increases smoothly, while at ~21 T a 'hump' shows up. Higher temperature blurs this behavior, and it can not be clearly observed at 20 K. Moreover, for the spin dynamics, at low temperature (4.2 K) and high magnetic field (> 8 T), after reaching the maximum, the time resolved DCP tends to decreases and slowly relaxes to at a constant level, which is quite different from the observations in III-V and II-VI NCs.