Effect of electrodeposition duration on the morphological and structural modification of the flower-like nanostructured ZnO

N. Ait Ahmed (1) , H. Hammache (1) , L. Makhloufi (1) , Marielle Eyraud (2) , S. Sam (3) , A. Keffous (3) , N. Gabouze (4)

1 LECVE - Laboratoire d'Electrochimie, Corrosion et de Valorisation Energétique [Université de Béjaïa]
2 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie
3 Centre de Recherche en Technologie des Semi-conducteurs pour l'Energétique
4 UDTS - Unité de Développement de la Technologie du Silicium

Flower-like morphology of ZnO thin films were successfully electrodeposited via a one-step route only by changing electrodeposition duration and potential at a fixed concentration on n-Si (100) in 78.10 À4 M Zn (NO 3) 2 , 6H 2 O and 0.1 M KNO 3 solution at 70 C without using any catalyst, additives or seed layer. The as electrodeposited products were characterized by X-ray diffraction, scanning electronic microscopy and photoluminescence. The effects of the electrodeposition potential and duration on the morphology, structure and photoluminescence properties were studied. The results show that the product morphology changes with a change in the applied voltage and electrodeposition duration. Well defined shape of flower-like ZnO morphology was generated under the limited conditions of À1.2 V for 60 min, with (002) preferred orientation. Strong UV emission is obtained in the case of ZnO flower like morphology electrodeposited at À1.2 V for 60 min. The band-gap energy value of ZnO flower-like, determined from optical reflectance spectra, is 3.37 eV.

Mots clés: band gap 2; zinc nitrate; ZnO; Electrodeposition; thin films

Domaines: Matériaux; Matériaux

N. Ait Ahmed, H. Hammache, L. Makhloufi, Marielle Eyraud, S. Sam, et al.. Effect of electrodeposition duration on the morphological and structural modification of the flower-like nanostructured ZnO. Vacuum, 2015, 120, pp.100-106. ⟨10.1016/j.vacuum.2015.04.009⟩. ⟨hal-02499503⟩