Study of Effect of Cadmium Source on the Structural, Morphological, Vibrational, and Optical Properties of CdS Window Layers

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER
Sana Hariech, Rihem Mohamed Cherif
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引用次数: 0

Abstract

Cadmium sulfide (CdS) thin films hold significant potential for photovoltaic and optoelectronic applications. However, attaining remarkable physicochemical properties remains an important aim. In the present paper, we report this aim by studying the influence of cadmium sources Cd(CH3COO)2, CdSO4, and Cd(NO3)2, rarely reported in the literature, on these properties. CdS films were synthesized on glass substrates, at 75°C, via chemical bath deposition. XRD analysis of prepared films indicates that the dominant structure of CdS thin films was hexagonal with a (002) preferential orientation in all samples. The lowest thickness (864 nm), highest crystallite size (95.88 nm), lowest deformation (1.04 × 10‒4) and lowest density of dislocations (1.08 × 10‒4 lines × nm–2) were found using Cd(CH3COO)2. Raman spectra showed that the greatest asymmetry of the peak located at 306.42 cm‒1 corresponding to the fundamental vibrational mode (1LO) and attributed to the Cd‒S chemical bonding, was observed for CdS films prepared from CdSO4 and Cd(NO3)2. This result meant that the defects concentration was higher using these two sources than using Cd(CH3COO)2. Furthermore, the optical results of CdS film prepared from Cd(CH3COO)2 exhibited the largest band gap (2.42 eV), lowest Urbach energy (133.21 meV), and highest transmittance (85%) in the visible wavelengths range (300‒800 nm). The extinction coefficient and refractive index were also affected by the cadmium source. Our findings demonstrated that Cd(CH3COO)2 is the best cadmium source compared to CdSO4 and Cd(NO3)2 to enhance the physicochemical properties of CdS film and make it perfectly suitable for use as a window layer for photovoltaic cells and optoelectronic devices.

Abstract Image

镉源对CdS窗口层结构、形态、振动和光学性质影响的研究
硫化镉(cd)薄膜在光伏和光电子领域具有巨大的应用潜力。然而,获得卓越的物理化学性质仍然是一个重要的目标。在本文中,我们通过研究文献中很少报道的镉源Cd(CH3COO)2、CdSO4和Cd(NO3)2对这些性质的影响来报道这一目的。在75°C的温度下,通过化学浴沉积在玻璃衬底上合成了CdS薄膜。制备薄膜的XRD分析表明,CdS薄膜的主要结构为六边形,并具有(002)优先取向。Cd(CH3COO)2的晶粒厚度最小(864 nm),晶粒尺寸最大(95.88 nm),变形最小(1.04 × 10-4),位错密度最小(1.08 × 10-4线× nm - 2)。拉曼光谱结果表明,CdSO4和Cd(NO3)2制备的CdS薄膜在306.42 cm-1处存在最大的不对称峰,对应于基本振动模式(1LO),这归因于Cd - s化学键。这意味着使用这两种来源的缺陷浓度比使用Cd(CH3COO)2的缺陷浓度高。此外,从Cd(CH3COO)2制备的CdS薄膜在可见光波段(300 ~ 800 nm)内具有最大带隙(2.42 eV)、最低乌尔巴赫能(133.21 meV)和最高透过率(85%)。消光系数和折射率也受到镉源的影响。研究结果表明,与CdSO4和Cd(NO3)2相比,Cd(CH3COO)2是最佳的镉源,可以提高CdS薄膜的物理化学性能,使其完全适合用作光伏电池和光电子器件的窗口层。
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来源期刊
Physics of the Solid State
Physics of the Solid State 物理-物理:凝聚态物理
CiteScore
1.70
自引率
0.00%
发文量
60
审稿时长
2-4 weeks
期刊介绍: Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.
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