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Int. J. Electroactive Mater. 8 (2020) 41-49

Sol Precursor Concentration Effect on the Synthesis and Characteristics of ZnO Nanoparticles Film

Zulkarnain Zainal1*, Huey Jing Tan1, Zainal Abidin Talib2, Hong Ngee Lim1, Suhaidi Shafie3, Sin Tee Tan2

1Chemistry, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
2Physics, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
3Functional Device Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, Serdang, Selangor, Malaysia

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Abstract : Zinc oxide nanorods (ZnO NRs) are known to be one of the intensive-studied materials for photoelectrochemical (PEC) solar cells application. The photoconversion efficiency of fabricated ZnO NRs photoelectrode is highly dependent on the conditions of the pre-deposited seed layer. In the present work, different concentrations but stable sol precursors were prepared and spun coated on a glass substrate. X-ray diffraction, field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy examined the structural, morphological and elemental properties of ZnO thin film. Meanwhile, films’ optical properties were studied by ultraviolet-visible and photoluminescence spectroscopies. Also, electrochemical impedance spectroscopy investigated the recombination resistance of deposited films while linear sweep voltammetry analyzed their photoelectrochemical performance. Based on the experimental results, optimum sol concentration of 0.30 M was determined from the perspectives of smooth and compact seed coverage, a crystalline film with less defect formation, favorable absorbance, and ease of charge carrier transport for photoelectrochemical reactions to take place.

Keywords : sol concentration ,spin coating,ZnO thin film,PEC cell,EIS,