INVESTIGADORES
VAZQUEZ marcela Vivian
congresos y reuniones científicas
Título:
Synthesis and characterization of Chlorine-doped ZnO nanopillars
Autor/es:
M. BERRUET; E. DALCHIELE; M. VAZQUEZ; R. MAROTTI
Reunión:
Congreso; . XIV Brazilian Materials Research Society Meeting; 2015
Resumen:
One-dimensional semiconductor nanowires and nanopillars have attracted increasing attention due to their physical properties arising from quantum confinement and are the fundamental building blocks for fabricating short-wavelength nanodevices. By controlling the reaction conditions during heterogeneous deposition of ZnO from aqueous solutions, such tunable nanostructures can be fabricated with the addition of n-type dopants [1]. Chloride can be adsorbed onto the nanowire surface or placed in the bulk. In the latter case, the electrical role depends on their position in the ZnO lattice. Chloride impurities may act as electrical donors if they substitute oxygen ions.ZnO nanopillars (NP-ZnO) were obtained by electrodeposition. To analyze the effect of chloride ions present in the electrolytic bath, NH4Cl solutions were progressively added in concentrations from 0 to 0.05 mol L-1. Optical properties showed a blue shift in absorption edge with increasing Cl- to Zn2+ concentration ratio by Moss-Burstein effect [2]. Moreover the Urbach band tail parameter also increases, which may be due to increasing lattice distortion due to defect incorporation. Electrical properties such as charge carrier density (N) and electrical resistance (R) were analyzed by EIS and I-V method, respectively. As expected, N increases and R decreases in chlorine-doped nanopillars. Also, the morphology, crystalline structure and chemical composition of NP-ZnO were analyzed by SEM, XRD and EDS, respectively.