Dolado Fernández, JaimeHidalgo Alcalde, PedroMéndez Martín, María Bianchi2023-06-162023-06-162020-09-150167-577X10.1016/j.matlet.2020.128152https://hdl.handle.net/20.500.14352/6514©2020 Elsevier B.V. All rights reserved. This work was supported by MICIN (Grant RTI2018-09195-B-I00).Herein, we report the influence of the surface conditions on the cathodoluminescence (CL) emissions from Zn_2GeO_4 nanowires and Zn_2GeO_4/SnO_2 heterostructures obtained by thermal evaporation technique. A Zn_2GeO_4 nanowire surrounded by a discontinuous shell of SnO_2 crystals composed the Zn_2GeO_4/SnO_2 heterostructures. Local CL measurements at different acceleration voltages allow monitoring the emission bands originated at the interface region, showing an additional deep-ultraviolet (UV) emission at 4.40 eV, which has not been previously reported. CL spectra from SnO_2 coated Zn_2GeO_4 nanowires also show this deep-UV emission. The results would confirm the presence of a shallow energy level close to the conduction band, which becomes active by passivation of Zn_2GeO_4 nanowires surface by the SnO_2 coating.engjournal articlehttp://dx.doi.org/10.1016/j.matlet.2020.128152https://www.sciencedirect.com/open access538.9EvaporizationZinc germanateUV luminescenceNanowiresFísica de materialesFísica del estado sólido2211 Física del Estado Sólido