نوع مقاله : مقاله پژوهشی
نویسندگان
Physics Laboratory of Thin Layers and Applications, Biskra University, BP 145 RP, Biskra 07000, Algeria
چکیده
In this study, we synthesized undoped and doped cobalt oxide (Co3O4) thin films at a concentration of 0.2 M, incorporating varying copper doping levels of 2, 4, 6, 8, and 10 wt. % through spray py-rolysis technique (SPT). The present investigation aims to enhance the characteristics of the films, including the crystalline size, band gap energy, and electrical conductivity. X-ray diffraction (XRD) patterns was used to determine the size of the crystalline structures. The findings indicate that in-corporating Cu leads to an increase in the crystallite size. The crystal size (D) increased to 40.94 nm after doping with 10 wt.% Cu. Energy-dispersive X-ray (EDX) mapping analysis validated the presence of copper within the Co3O4 thin films. We identified two distinct band gaps from the ab-sorption coefficient measurements: E1 and E2. The band gap energy values ranged from 1.441 to 1.388 eV and from 2.061 to 2.012 eV, depending on the Cu doping concentration. The electrical properties demonstrated a reduction in the Rsheet resistance and an enhancement in the electrical conductivity as the concentration of Cu increased.
کلیدواژهها
موضوعات
عنوان مقاله [English]
Improvement of Crystallite Size, Band Gap, and Electrical Conductivity in Cu-Doped Co₃O₄ Thin Films Prepared by Spray Pyrolysis
نویسندگان [English]
- Nadjette Belhamra
- Sabah Haffas
- Okba Belahsen
- Nourelhouda Redjouh
- Nadjette Belhamra
- Zahia Bencharef
Physics Laboratory of Thin Layers and Applications, Biskra University, BP 145 RP, Biskra 07000, Algeria
چکیده [English]
In this study, we synthesized undoped and doped cobalt oxide (Co3O4) thin films at a concentration of 0.2 M, incorporating varying copper doping levels of 2, 4, 6, 8, and 10 wt. % through spray py-rolysis technique (SPT). The present investigation aims to enhance the characteristics of the films, including the crystalline size, band gap energy, and electrical conductivity. X-ray diffraction (XRD) was used to determine the size of the crystalline structures. The findings indicate that in-corporating Cu leads to an increase in the crystallite size. The crystal size (D) increased to 40.94 nm after doping with 10 wt.% Cu. Energy-dispersive X-ray (EDX) mapping analysis validated the presence of copper within the Co3O4 thin films. We identified two distinct band gaps from the ab-sorption coefficient measurements: E1 and E2. The band gap energy values ranged from 1.441 to 1.388 eV and from 2.061 to 2.012 eV, depending on the Cu doping concentration. The electrical properties demonstrated a reduction in the Rsheet resistance and an enhancement in the electrical conductivity as the concentration of Cu increased.
کلیدواژهها [English]
- Copper
- oxide cobalt
- spinel lattice
- SP deposition
- characterization
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