title: VIS-UV ZnCdO/ZnO multiple quantum well nanowires and the quantification of Cd diffusion.
abstract: We report on the growth and microstructure analysis of high Cd content ZnCdO/ZnO multiple quantum wells (MQW) within a nanowire. Heterostructures consisting of ten wells with widths from 0.7 to 10 nm are demonstrated, and show photoluminescence emissions ranging from 3.03 to 1.97 eV. The wells with thicknesses ≦̸2 nm have high radiative efficiencies compared to the thickest ones, consistent with the presence of quantum confinement. However, a nanometric analysis of the Cd profile along the heterostructures shows the presence of Cd diffusion from the ZnCdO well to the ZnO barrier. This phenomenon modifies the band structure and the optical properties of the heterostructure, and is considered in order to correctly identify quantum effects in the ZnCdO/ZnO MQWs.
authors.affiliation: ISOM and Dept. Ing. Electrónica, Univ. Politécnica Madrid, Avda. Complutense 30, 28040 Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Lopez-Ponce
authors.forename: A
authors.initials: A
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: J
authors.initials: J
authors.lastname: Temmyo
authors.forename: S
authors.initials: S
authors.lastname: Agouram
authors.forename: M C
authors.initials: MC
authors.lastname: Martínez-Tomás
authors.forename: V
authors.initials: V
authors.lastname: Muñoz-Sanjosé
authors.forename: P
authors.initials: P
authors.lastname: Lefebvre
authors.forename: J M
authors.initials: JM
authors.lastname: Ulloa
authors.forename: E
authors.initials: E
authors.lastname: Muñoz
authors.forename: A
authors.initials: A
authors.lastname: Hierro