Optical and magnetic properties of ZnCoO layers
M. Godlewski, M.I. {\L}ukasiewicz, E. Guziewicz, V.Yu. Ivanov, {\L}., Owczarczyk, B.S. Witkowski
TL;DR
This paper investigates the optical and magnetic properties of ZnCoO layers grown by Atomic Layer Deposition, revealing absorption features related to Co ionization and discussing mechanisms of photoluminescence quenching.
Contribution
It provides new insights into the optical absorption and PL quenching mechanisms in ZnCoO films, highlighting the effects of Co recharging in the ZnO lattice.
Findings
Absorption onset at about 2.4 eV related to Co ionization
Strong PL quenching observed due to Co recharging
Discussion of mechanisms behind PL quenching
Abstract
Optical and magneto-optical properties of ZnCoO films grown at low temperature by Atomic Layer Deposition are discussed. Strong wide band absorption, with onset at about 2.4 eV, is observed in ZnCoO in addition to Co-related intra-shell transitions. This absorption band is related to Co 2+ to 3+ photo-ionization transition. A strong photoluminescence (PL) quenching is observed, which we relate to Co recharging in ZnO lattice. Mechanisms of PL quenching are discussed.
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