Electrochemical synthesis of n-type ZnS layers on p-Cu2O/n-ZnO heterojunctions with different deposition temperatures. Issue 50 (16th September 2019)

• Record Type: Journal Article
• Authors: Bengas, Rayhena; Lahmar, Halla; Redha, Khelladi Mohamed; Mentar, Loubna; Azizi, Amor; Schmerber, Guy; Dinia, Aziz
• Is Part Of: RSC advances. Volume 9:Issue 50(2019)
• Page Start: 29056
• Page End: 29069
• Publication Date: 2019-09-16
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra04670d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Metal oxide p–n heterojunctions consisting of p-Cu2 O/n-ZnO/n-ZnS nanostructures were deposited on an ITO substrate by three-step electrodeposition. Abstract : Metal oxide p–n heterojunctions consisting of p-Cu2 O/n-ZnO/n-ZnS nanostructures were deposited on an ITO substrate by three-step electrodeposition. The effect of ZnS layer deposition temperature on the properties of the heterojunction was investigated by different techniques. The Mott–Schottky analysis confirmed the n-type conductivity for ZnO and ZnS and p-type conductivity for the Cu2 O layer, respectively. Also, it showed a decrease of ZnS donor concentration with increasing deposition temperature. The X-ray diffraction (XRD) analysis confirms a pure phase of hexagonal ZnO, cubic ZnS and cubic Cu2 O structures, respectively. The heterojunction with ZnS deposited at 60 °C shows high crystallinity. The morphological measurements by scanning electron microscopy (SEM) indicate that the deposition temperature has a significant influence on the morphology of ZnO and the atomic force microscopy (AFM) images revealed the improvement of Cu2 O morphology by increasing the ZnS deposition temperature. The UV-Vis response shows strong absorption in the visible region and the profile of optical absorption spectra changes with the ZnS deposition temperature. The current–voltage ( I – V ) characteristics of the Au/p-Cu2 O/n-ZnO/n-ZnS/ITO heterojunction display well-defined rectifying behavior for the heterojunction with ZnS deposited at 60 °C.