Photoluminescence enhancement in nanocomposite thin films of CdS–ZnO

Abstract

We show that the photoluminescence emitted from a dense, two-component quantum dot ensemble on a thin film is significantly higher and decays much faster than that from quantum dots of either of the two pure systems ͑CdS and ZnO͒. The semiconductor nanocomposite, in which the characteristic grain size of each species was 2 -3 nm, was deposited directly on Si wafers by high-pressure magnetron sputtering, and exhibits a single, relatively sharp optical absorption edge.

Nanoscale ZnO/CdS heterostructures with engineered interfaces for high photocatalytic activity under solar radiation

“…Previously, Ayyub et al had reported a detailed study on the enhancement of PL intensity in the green emission zone for ZnO-CdS thin film composites where the particle size was in the order of 2-3 nm, compared to the individual ZnO and CdS of the same particle size. 41 In this study, we also observed a similar trend in the photoluminescence quenching for the hybrids which is indicative of the interaction between the ZnO and the CdS nanoparticles in the hybrids. The emission spectra recorded for CdS in the nanohybrid ZC-1 and ZC-2, as given in Fig.…”

A method to form semiconductor quantum dot (QD) thin films by igniting a flame at air–liquid interface: CdS and WO3

“…4b, curve D' and therefore, correlation between defect states and emission at 480 nm is re-established. This emission is in agreement with that of reported for CdS composite thin films [59].…”

Decoration of CdS nanoparticles on 3D self-assembled ZnO nanorods: a single-step process with enhanced field emission behaviour

“…The maximum in the PL emission is "Stokes shifted" with respect to the absorption edge of ZnO and can be a favourable feature for many applications. [30][31][32]…”