In this study, two layers: i-ZnO nanorods and p-Cu2O were fabricated by electrochemical deposition. The fabricating process was the initial formation of ZnO nanorods layer on the n-IGZO thin film which was prepared by sputtering method, then a p-Cu2O layer was deposited on top of rods to form the p-Cu2O/i-ZnO nanorods/n-ZnO heterojunction. The XRD, SEM, UV–VIS, I–V characteristics methods were used to define structure, optical and electrical properties of these heterojunction layers. The fabricating conditions and thickness of the Cu2O layers significantly affected to the formation, microstructure, electrical and optical properties of the junction. The length of i-ZnO nanorods layer in the structure of the heterojunction has strongly affected to the carriers transport mechanism and performance of this heterojunction.

No abstract

The p-Cu₂O/i-ZnO nanorods/n-IGZO heterojunctions were fabricated by electrochemical and sputtering method. ZnO nanorods were grown on conductive indium gallium zinc oxide (IGZO) thin film and then p-Cu₂O layer was deposited on ZnO nanorods to form the heterojunction. ZnO nanorods play an important role in carrier transport mechanisms and performance of the junction. The changing of defects in ZnO nanorods by annealing samples in air and vacuum have studied. The XRD, photoluminescence (PL) spectroscopy, and FTIR were used to study about structure, and defects in ZnO nanorods. The SEM, i–V characteristics methods were also used to define structure, electrical properties of the heterojunctions layers. The results show that the defects in ZnO nanorods affected remarkably on performance of heterojunctions of solar cells.

Bentonite/polymer fluid systems are often used to drill wells in the top of basement formation of the continental shelf of Vietnam, where the formation pressure gradient gradually reaches to subnormal pressure. Thus, bentonite/polymer drilling fluids with the mud weight from 8.4 ppg to 8.5 ppg are able to drill this section. In this study, the effect of the polymer concentrations on the initial parameters of the drilling fluid models have been presented in the detail of the article. Moreover, non-Newtonian fluid models often describe the behavior of fluids, which the models as Bingham plastic, Power law, Casson model, Herschel Bulkley, and Robertson-Stiff have mentioned. To determine the initial parameters of the models, the mathematical least square method is used. The database was gathered from 6 dial readings as 600 rpm, 300 rpm, 200 rpm, 6 rpm and 3 rpm of API 13B standard. Finally, the ANOVA table analysis shows that the confident coefficient reaches 100%, which has been demonstrated to be highly significant by the models.