Farklı katodik potansiyellerde Zn (NO3) .6H2O sulu çözeltisi kullanılarak elektrodepozisyon yöntemi ile elde edilen ZnO filmlerin bazı fiziksel özellikleri

Year 2017, Volume: 21 Issue: 6, 1146 - 1152, 01.12.2017

Ayça Kıyak Yıldırım , Barış Altıokka

https://doi.org/10.16984/saufenbilder.306870

Abstract

Farklı katodik potansiyellerde ITO kaplı cam alt tabaka
üzerinde elektrokimyasal depozisyon ile hazırlanan polikristal ZnO filmler
incelenmiştir. Tüm deneylerde, Zn (NO₃) .6H₂O sulu
çözeltisi elektrolit olarak kullanılmıştır ve depozisyon sıcaklığı depozisyon
boyunca 72^OC tutulmuştur. Dönüşümlü voltametri deneyleri
elektrodepozisyon için katodik potansiyel aralığının tespiti için yapılmıştır.
Bundan sonra, -0.80 V’den 1,16 V’ye kadar artarak değişen  katodik 
potansiyel aralığı seçilmiştir. Polikristal ZnO filmlerin
karakterizasyonu X-ışını kırınımı (XRD), UV-vis spektrofotometre ve taramalı
elektron mikroskobu (SEM) yöntemleri kullanılarak gerçekleştirilmiştir. XRD
sonuçları, tüm filmlerin altıgen kristal yapısında olduğunu ve tüm filmlerin
yaklaşık olarak 46 nm tane büyüklüğünde oluşturulmuş olduğunu
göstermiştir.  ZnO filmlerin enerji bant
aralığı 3.50 eV’ ile 3.56 eV aralığında değişmektedir. Polikristalin ZnO
filmlerin morfolojisi büyük ölçüde elektrokimyasal depozisyon işleminin
katodik potansiyeline bağlı olduğu SEM görüntülerinden anlaşılmaktadır. Ayrıca
dilim şeklide, pullu ve dantele benzeyen 
çeşitli morfolojik yapılar bulunmuştur.

Keywords

ZnO, katodik potansiyel, Enerji band aralığı

Some physical properties of the ZnO films obtained by electrodeposition using Zn (NO3) .6H2O aqueous solution at different cathodic potentials

Abstract

Polycrystalline ZnO films prepared by electrodeposited on ITO coated glass substrate at
different cathodic potential were investigated. In all experiments Zn(NO3).6H₂O
aqueous solution was used as an electrolyte and depositions temperature were
kept at 72^OC for the period of the depositions. Cyclic voltammetry
experiments were performed to determinate the cathodic potential ranging for
electrodeposition. After that, the cathodic potential ranging from -0.8 to
-1.16 V were selected. Characterization of polycrystalline ZnO films was realized using X-ray diffraction (XRD), UV-vis spectrophotometer and scanning electron microscopy
(SEM) methods .XRD results shown that all films
formed in hexagonal crystal structure and crystallite sizes of the all
films are approximately 46 nm. The energy band gaps
of the ZnO films are from 3.50 to  3.56
eV. It was understood from the SEM images that the morphology of
polycrystalline ZnO films depends greatly on the cathodic potential of
depositions. Also various morphological structure
was found such as slicely, lamellar and lace like structure.

Keywords

ZnO, Cathodic potential, Energy Band Gap

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