Investigation of the ultrafast excitation dynamic of carriers in polar ZnO / ZnMgO quantum wells

D. O. Siebadji T.; M. Ziegler; O. Crégut; P. Gilliot; A. Balocchi; C. Morhain; M. Gallart

doi:10.1117/12.3022209

6 June 2024 Investigation of the ultrafast excitation dynamic of carriers in polar ZnO / ZnMgO quantum wells

D. O. Siebadji T., M. Ziegler, O. Crégut, P. Gilliot, A. Balocchi, C. Morhain, M. Gallart

Proceedings Volume PC12992, Advances in Ultrafast Condensed Phase Physics IV; PC1299212 (2024) https://doi.org/10.1117/12.3022209
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

Making use of non-degenerate time-resolved pump-probe ultrafast spectroscopy, we investigate the photocarrier dynamics in a polar ZnO/Zn0.85Mg0.15O Quantum Well (QW) using a pump pulse at 266 nm, creating photocarriers in the ZnMgO barrier, and a super-continuum probing the differential reflectance of the sample in the 345-400 nm spectral range. We evidence an ultrafast capture of carriers inside the QW followed by an efficient radiative recombination. A low energy companion of the exciton is identified as an excitonic complex (trion or biexciton) while the high sensitivity our experiment enabled us to observe a signature at 60 meV higher than the fundamental exciton that we attribute to the first excited state in the QW.

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D. O. Siebadji T., M. Ziegler, O. Crégut, P. Gilliot, A. Balocchi, C. Morhain, and M. Gallart "Investigation of the ultrafast excitation dynamic of carriers in polar ZnO / ZnMgO quantum wells", Proc. SPIE PC12992, Advances in Ultrafast Condensed Phase Physics IV, PC1299212 (6 June 2024); https://doi.org/10.1117/12.3022209

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