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HL: Fachverband Halbleiterphysik
HL 7: Poster I
HL 7.16: Poster
Monday, March 27, 2023, 13:00–15:00, P2/EG
Exciton-polariton emission in copper halides — •E. Krüger1, S. Merker2, S. Blaurock2, R. Hildebrandt1, A.L. Pereira1, L. Käferstein1, H. Krautscheid2, M. Grundmann1, and C. Sturm1 — 1Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, Germany — 2Universität Leipzig, Institut für Anorganische Chemie, Germany
Copper halides (CuI, CuBr, and CuCl) have recently attracted research interest since they combine intrinsic p-type conductivity with large bandgaps (3.1 eV - 3.4 eV) and high exciton binding energies (62 meV - 190 meV), making them promising candidates for applications in transparent optoelectronics [1].
Here, we present an overview of the optical properties of solution grown Cu-halide bulk single crystals, focusing especially on spectral- and time-resolved measurements of the near-band-edge luminescence for temperatures between 10 K and room temperature. The line shape of the emission lines at low temperatures is interpreted in terms of exciton-polaritons and their dispersion relation [2]. The different decay characteristics of free and localized states are explained by their coupled interaction. In addition to observation of an anomalous temperature-dependent bandgap shift to higher energies with increasing temperature we present in detail the temperature-dependent decay characteristics of the polariton emission and discuss the corresponding relaxation mechanisms.
[1] M. Grundmann et al., pss (a) 210, 1671 (2013)
[2] E. Krüger et al., APL Mater. 9, 121102 (2021)