Owoeye Victor Adewale, Adewinbi Saheed Adekunle, Salau Ayodeji Olalekan, Orelusi Ayodele Nicholas, Adeoye Abiodun Eyitayo, Akindadelo Adedeji Tomide
Department of Physical and Chemical Sciences, Elizade University, Ilara-Mokin, Nigeria.
Department of Physics, Osun State University, Osogbo, Osun State, Nigeria.
Heliyon. 2023 Jan 16;9(1):e13023. doi: 10.1016/j.heliyon.2023.e13023. eCollection 2023 Jan.
In this study, spray pyrolysis was used to produce nanostructured NiO thin films from high purity nickel acetate (Ni(CHCOO).3HO) precursors on pre-heated ultrasonically cleaned soda-lime glass substrates. The metallic constituent concentrations in the films were varied, and the precursors were produced in distilled water at various molarities ranging from 0.1 to 0.4 M. In the study, the field-emission scanning electron microscope (FESEM) results strongly confirmed adherence of the films to the glass substrate at 350 °C. The presence of Ni and O in the samples was confirmed using Rutherford backscattering spectroscopy (RBS), X-ray diffractometry (XRD) and energy dispersive X-ray spectroscopy (EDX). For the 0.1 M NiO thin films, the thickness was approximately 43 nm, and for the 0.2 M, 0.3 M, and 0.4 M films, the thickness was 46 nm, 47 nm, and 49 nm, respectively. The XRD findings were supported by the increased Raman intensity peaks with increased precursor concentration, which confirmed the films' improved crystallinity. For the same number of passes of films deposition, as the molar concentration increases, the films thickness increases. The amount of nickel in NiO thin films increases as the molarity increases, but the amount of oxygen in NiO thin films decreases as the molarity increases. It was discovered that as molarity increases, the optical transmittance decreases and the optical band gap narrows. The qualities of NiO discovered in this study suggest the films' potentials for usage as window layer and buffer material in thin film solar cells.
在本研究中，采用喷雾热解法，以高纯度醋酸镍（Ni(CH₃COO)₂·3H₂O）为前驱体，在预热的经超声清洗的钠钙玻璃基板上制备了纳米结构的NiO薄膜。改变薄膜中金属成分的浓度，前驱体在蒸馏水中以0.1至0.4 M的不同摩尔浓度制备。在该研究中，场发射扫描电子显微镜（FESEM）结果有力地证实了薄膜在350°C时与玻璃基板的附着力。使用卢瑟福背散射光谱（RBS）、X射线衍射仪（XRD）和能量色散X射线光谱（EDX）确认了样品中Ni和O的存在。对于0.1 M的NiO薄膜，厚度约为43 nm，对于0.2 M、0.3 M和0.4 M的薄膜，厚度分别为46 nm、47 nm和49 nm。XRD结果得到了拉曼强度峰随前驱体浓度增加而增加的支持，这证实了薄膜结晶度的提高。对于相同的薄膜沉积次数，随着摩尔浓度的增加，薄膜厚度增加。NiO薄膜中镍的含量随着摩尔浓度的增加而增加，但NiO薄膜中氧的含量随着摩尔浓度的增加而减少。研究发现，随着摩尔浓度的增加，光学透过率降低，光学带隙变窄。本研究中发现的NiO的性质表明该薄膜有潜力用作薄膜太阳能电池的窗口层和缓冲材料。
