Structural and optical modifications of CdS properties in CdS-Au thin films prepared by CBD

• DOI: 10.1016/j.rinp.2021.103914
• Publication Date: 2021-02-03T15:01:48Z
• Authors: J.I. Contreras-Ra...; J. Díaz-Reyes; A. Flores-Pacheco; R. Lozada Morales; M.E. Álvarez-Ramos; J.A. Balderas-López
• Keywords: Chemical bath deposition; Cadmium sulfide; Potential well

In this work highlights the modifications of crystalline structure and properties nanostructured cadmium sulphide (CdS) thin films, including gold quantum dots grown to form a hybrid metal-semiconductor system. By means chemical bath deposition (CBD) good quality films are obtained, with advantage doping in-synthesis no required additional steps. Film thicknesses around 100 nm were determined by ellipsometry. The binding energies elements in CdS CdS-Au samples measured X-ray photoelectronic spectroscopy (XPS). materials was studied diffraction (XRD). A change from disperse like-single-crystalline (highly oriented) NP's monodisperse NP's–Au QD's observed. This behaviour confirmed TEM micrographs. pass an intermediate confinement regime (IQCR) strong one (SQCR) CdS-Au. Raman vibrational spectra allowed analysis phonon emissions CdS, where shift gives structural information confirms effects IQCR SQCR optical UV–Vis characterization describes effect modifications, band gap at higher energy sample related SQCR. Photoluminescence (PL) room-temperature shows decrease PL intensity film due via defects-recombination, respect that CdS. fact is interpreted as decreasing surface defects passivation Au presence.