Abstracts Book - IMRC 2018

• SC4-P048
LUMINISCENCE AND CONDUCTIVITY ON Ag-DOPED ZnO FILMS
Juan Araiza 1 , Manuel Herrera 2
1 Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE),
Nanociencias, Mexico. 2 Centro de Nanociencias y Nanotecnología CNyN-UNAM, Física, Mexico.
Zinc Oxide thin films have gained considerable interest due to its important
electrical and optical properties. Compared with other semiconductors, ZnO has
better electron mobility, wide direct band gap (Eg = 3.3 eV) and large excitonbinding
energy (~60 meV), making it an alternative candidate for nanooptoelectronic
devices, including photodiodes and solar cells. In this work the
ZnO:Ag thin films were grown onto Si (100) substrates and were achieved using
the hydrothermal method. Morphology, crystallinity, and chemical composition
were characterized by using scanning electron microscopy (SEM), X-ray
diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and X-ray
photoelectron spectroscopy (XPS). Along with this, the point defects were
characterized using the cathodoluminescence (CL) technique. All the as-grown
nanostructures were wurtzite type crystalline structure. The CL spectra of
ZnO:Ag films showed two luminescent components centered at 2.2 and 2.5 eV,
associated with the well-known yellow and green emission of ZnO. These
emissions were attributed to zinc vacancies (VZn) and interstitial oxygen (Oi)
respectively. Finally, XPS measurements of ZnO:Ag showed that the chemical
state of the silver ions was monovalent, indicating the substitution of Ag + in Zn
sites and their acceptor nature in the ZnO semiconductor film.
Acknowledgment:
To PAPIIT IN101917 DGAPA-UNAM project that funded part of this work. We
appreciate the help given by the technicians,
Martha Eloisa Aparicio Ceja and M.Sc. David Dominguez, for the realization of
this work.
Keywords: zinc oxide, cathodoluminicesce, hydrothermal method
Presenting authors email: araizagm@gmail.com