Regensburg 2022 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 21: Optical Properties 1
HL 21.1: Vortrag
Mittwoch, 7. September 2022, 15:00–15:15, H32
Dynamics of exciton-polariton emission in CuI — •E. Krüger1, M. Bar1, S. Blaurock2, L. Trefflich1, R. Hildebrandt1, A. Müller1, O. Herrfurth1,3, G. Benndorf1, H. von Wenckstern1, H. Krautscheid2, M. Grundmann1, and C. Sturm1 — 1Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, Germany — 2Universität Leipzig, Institut für Anorganische Chemie, Germany — 3now at: Active Fiber Systems GmbH, Germany
Copper iodide (CuI) is a promising candidate for transparent optoelectronic applications due to its large band gap of 3.1 eV and high exciton binding energy of 62 meV [1]. Here we present spectral- and time-resolved measurements of the near-band-edge luminescence of CuI bulk crystals for temperatures between 10 K and 250 K. The line shape of the emission lines at low temperatures is interpreted in terms of defect-bound exitons and exciton-polaritons [2]. The different decay characteristics of free and localized exciton states are explained by their coupled interaction. Based on the rise time of bound excitons, the defect density is estimated to be about 1× 1017 cm−3, which is in good agreement with the density of free holes at room temperature. The decay times of the free exciton polaritons increase with increasing temperature up to 360 ps. For the emission of bound excitons, decay times between 180 ps and 380 ps are observed at low temperatures.
[1] M. Grundmann et al., pss (a) 210, 1671 (2013)
[2] E. Krüger et al., APL Mater. 9, 121102 (2021)