Effect of Molar Concentration on Structural, Morphological and Optical Properties of CdO Thin Films Prepared by Chemical Bath Deposition Method

Year 2019, Volume: 9 Issue: 2, 847 - 854, 01.06.2019

Sibel Morkoç Karadeniz

https://doi.org/10.21597/jist.467530

Abstract

Cadmium Oxide (CdO) thin films were grown on Indium Tin Oxide (ITO) coated glasses by Chemical Bath Deposition (CBD) technique. The concentration of aqueous bath was varied between 0.03 M and 0.05 M. The films were annealed at 400 °C for 2 h. Structural, morphological and optical properties of the CdO thin films were investigated with XRD, SEM and Uv-Vis measurements. Additionally, the hydrophobic and hydrophilic nature of the films were studied with the water contact angle (WCA) measurements. The CdO thin films showed cubic crystal phase diffraction peaks in the spectra. The surface of CdO thin films changed from prism-like morphology to network-like (nano-fibrous) morphology with increasing concentration. The optical band gaps of thin films were calculated between 3.816-3.857 eV by Uv-Vis spectra. The Prisma- like morphology exhibited maximum transmittance above 65%. Nature of the CdO thin film surface changed from hydrophobic to hydrophilic, depending on changing morphology with increasing the precursor concentration.

Keywords

Cadmium Oxide, Chemical Bath Deposition, the Effect of Concentration

Thanks

Thanks to the research laboratory of Atatürk University for SEM microphotographs and thank to the research laboratories of Erzincan Binali Yıldırım University for other characterization techniques.

Kimyasal Banyo Biriktirme Metodu ile hazırlanmış CdO İnce Filmlerin Yapısal, Morfolojik ve Optik Özellikleri Üzerinde Molar Konsantrasyonu Etkisi

Abstract

Kadmiyum Oksit (CdO) ince filmler, farklı konsantrasyonlardaki solüsyonlar kullanılarak İndiyum Kalay Oksit (ITO) kaplamalı camlar üzerine Kimyasal Banyo Biriktirme (CBD) yöntemi ile sentezlenmiştir. CdCl2’nin sulu banyosunun konsantrasyonu 0.03 M ile 0.05 M arasında değişmektedir. Filmler 400 °C ‘de 2 saat tavlanmıştır. CdO ince filmlerin yapısal, morfolojik ve optik özellikleri araştırılmıştır. Ek olarak, filmlerin hidrofobik ve hidrofilik yapısı, su temas açısı (WCA) ölçümleriyle çalışılmıştır. Bütün filmler kübik kristal yapıdan elde edilmiş, ancak ince filmlerin yüzey morfolojisi artan konsantrasyon ile, prizma benzeri yapılardan ağsı (nano lifli) yapılara dönüşmüştür. Optik bant boşluğu Uv-Vis spektrumları kullanılarak değerleri 3.816-3.857 eV aralığında hesaplanmıştır. Prizma benzeri morfoloji %65 üzerinde maximum geçirgenlik göstermiştir. Konsantrasyonun artmasıyla, CdO ince filmlerin yüzey doğası, morfolojide meydana gelen değişikliklere bağlı olarak hidrofobik yapıdan hidrofilik yapıya dönüşmüştür.

Keywords

Kadmiyum Oksit, Kimyasal Banyo Biriktirme, Konsantrasyon Etkisi

References

• Ahmed HH, 2017. Variation of the structural, optical and electrical properties of CBD CdO with processing temperature. Materials Science in Semiconductor Processing, 66:215–222.
• Bulakhe RN, Lokhande CD, 2014. Chemically deposited cubic structured CdO thin films: Use in liquefied petroleum gas sensor.Sensors and Actuators B: Chemical, 200:245-250.
• Chala S, Sengouga N, Yakuphanoglu F, 2015. Modeling the effect of defects on the performance of an n-CdO/p-Si solar cell. Vacuum, 120:81-88.
• Chandiramouli R, Jeyaprakash BG, 2013. Review of CdO thin films. Solid State Sciences, 16: 102-110
• Ghosh M, Rao CNR, 2004. Solvothermal synthesis of CdO and CuO nanocrystals. Chemical Physics Letters, 393:493-497.
• Güney H, İskenderoğlu D, 2019. The effect of Zn doping on CdO thin films grown by SILAR method at room temperature. Physica B: Condensed Matter, 55:119-123
• Jakaria A, Kateryna B, Michael O, Mohan VJ, 2014. Wetting, Solubility and Chemical Characteristics of Plasma-Polymerized 1-Isopropyl-4-Methyl-1,4-Cyclohexadiene Thin Films. Coatings, 4:527-552
• Jung Y, Baek SH, Park JI, 2014. Controllable deposition of cadmium oxide and hydroxide nanostructures on silicon using a hydrothermal method. Journal of Alloys and Compounds, 595:46-50.
• Kenanakis G, Stratakis E, Vlachou K, Vernardou D, Koudoumas E, Katsarakis N, 2008. Light-induced reversible hydrophilicity of ZnO structures grown by aqueous chemical growth. Applied Surface Science, 254: 5695-5699.
• Morkoç Karadeniz S, Kılınç T, Bozkurt Çırak B, Irmak Sakaoğlu T, Çırak Ç, Ertuğrul M, Ekinci A.E, 2016. Structural, Morphological and Optical Properties of Well-Ordered CdO nanostructures Synthesized by Easy-Economical Chemical Bath Deposition Technique. Spectroscopy and Spectral Analysis, 36:1998-2000.
• Myint MTZ, Kumar NS, Hornyak GL, Dutta J, 2013. Hydrophobic/hydrophilic switching on zinc oxide micro-textured surface. Applied Surface Sciences, 264: 344-348.
• Rashidzadeh M, Carbajal-Franco G, Tiburcio-Silver A, 2016. Hydrophobic Coatings Composed by Cubic-Shaped CdO Nanoparticles Grown by a Novel and Simple Microwave Method. Journal of Nanoparticles, 2016:1-6.
• Salunkhe RR, Shinde VR, Lokhande CD, 2008. Liquefied petroleum gas (LPG) sensing properties of nanocrystalline CdO thin films prepared by chemical route: Effect of molarities of precursor solution. Sensors and Actuators B, 133:296–301
• Thambidurai M, Muthukumarasamy N, Ranjitha A, Velauthapillai D, 2015. Structural and optical properties of Ga-doped CdO nanocrystalline thin films. Superlattices and Microstructures, 86:559-563.
• Usharani K, Balun AR, Nagarethinam VS, Suganya M, 2015. Characteristic analysis on the physical properties of nanostructured Mg-doped CdO thin films—Doping concentration effect. Progress in Natural Science: Materials International, 25: 251–257.
• Yousefi R, Jamali-Sheini F, Khorsand ZA, Mahmoudian MR, 2012. Effect of indium concentration on morphology and optical properties of In-doped ZnO nanostructures. Ceramics International, 38:6295-6301