Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 76: Poster IIIC

HL 76.25: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG

Surface charge-carrier dynamics of CsPbBr3 inorganic perovskite — •Felix Trunk, Janek Rieger, Thomas Fauster, and Daniel Niesner — Lehrstuhl für Festkörperphysik, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Staudtstr. 7, D-91058 Erlangen, Germany

Several models have been proposed to understand the outstanding long lifetimes of charge carriers in lead-halide perovskites. Amongst others, there is an ongoing debate about the role of the organic ion on the charge-carrier cooling. We investigated the femto- to picosecond dynamics of conduction-band electrons at the surface of the purely inorganic perovskite CsPbBr3.
Time-resolved bichromatic two-photon photoelectron spectroscopy with femtosecond time-resolution was carried out on epitaxially grown films with well-defined crystalline surfaces. The position of the conduction-band minimum indicates that our samples are intrinsic. Therefore, the carrier dynamics is dominated by electron-phonon scattering rather than electron-electron scattering.
In a systematic study, we could identify three different time regimes. After the initial cooling we can detect a second time constant before the charge carriers recombine.
The poster will focus on a comparison of carrier dynamics for different sample temperatures and thicknesses. From the latter we can distinguish carrier recombination at the surface from their diffusion into the bulk.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden