Non-monotonous size-dependent photoluminescence and excitonic relaxations in nanostructured ZnO thin films.

ABSTRACT: The size dependence of room-temperature photoluminescence (PL) accompanied with near-band-edge emission (NBE) and defect-associated green emission (GE) was investigated using high-quality crystalline nanostructured ZnO thin films with grain sizes varying from 29 nm to 2 nm. The size dependence of correlated intensities of the PL bands was pursued in correlation with structural and defect evolution revealed by X-ray photoelectron spectroscopy (XPS) and previous studies of XRD and Raman scattering. In contrast to the influence of thermally activated reconstruction and changes in defect densities, quantum size effects emerging at grain sizes below a critical value, i.e., d _c ∼ 10 nm were inspected in relation to the observed blueshift in the bandgap and correlated var

SUBMITTER: Gandhi AC 

PROVIDER: S-EPMC9059825 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature