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Tunable optoelectronic and sensing properties of spray-deposited W-doped CdO thin films.

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Title: Tunable optoelectronic and sensing properties of spray-deposited W-doped CdO thin films.
Authors: Velusamy, P.1 (AUTHOR) velusamy.phy@gmail.com, Sivaprakash, P.1,2 (AUTHOR), Elamurugu, Elangovan3 (AUTHOR), Sathiya, M.4 (AUTHOR), Esakki Muthu, S.5 (AUTHOR), Kim, Ikhyun1,2 (AUTHOR) kimih@kmu.ac.kr
Source: Ceramics International. Dec2025:Part A, Vol. 51 Issue 29, p60381-60392. 12p.
Subject Terms: *OPTOELECTRONICS, *CADMIUM oxide, *THIN films, *GAS detectors, *SURFACE coatings, *LIGHT transmission, *X-ray diffraction, *BAND gaps
Abstract: In this present research work, the author investigates the influence of tungsten (W) external impurity on the physical-chemical and optoelectronic properties of CdO. The X-ray diffraction spectra reveal that the undoped and W-doped CdO polycrystalline thin films have cubic crystal structures with high texture along (111) and (200) orientations. An atomic force microscope was used to measure the roughness of CdO films (2.24 nm–7.40 nm). Concerning W-doping, the particle size varied from 64 nm to 104 nm. X-ray photoelectron spectroscopy was used to analyze the presence of elements and the nature of oxidation statuses (of Cd2+, O2−, and W5+). Hall measurements confirmed the n-type conductive nature, and the low resistivity (7.01 × 10−4 Ω cm) and high mobility (81 cm2/V. s) were attained for 0.25 wt% W-doped CdO thin film. The optical band gap of the film ranges from 2.38 eV to 2.45 eV, depending on the W-doping concentration. This variation can help tailor the optical behaviors of CdO films for precise applications. The average transmittance varies from 72 % to 87 %, indicating that the films can be used in highly transparent applications. The highest optoelectronic function (high figure of merit) was gained at 25 wt% W-doped CdO thin film (8.37 × 10−3 Ω−1). The 1.0 wt% W-doped CdO film shows a remarkable response to formaldehyde gas, with a sensitivity of 72.83 %. This suggests potential applications in gas sensing technologies. The optoelectronic characteristics of spray-deposited CdO thin film are improved by the surface morphological enhancement generated by the dopant. [Display omitted] • W-doped CdO thin films were fabricated utilizing a cost-effective chemical spray pyrolysis system. • A high mobility of 81 cm2/V. s is achieved. • Achieved is a high transmittance of 87 % and an improved optical band gap of 2.45 eV. • A significant figure of merit of 4.56 × 10−3 Ω−1 is achieved. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:In this present research work, the author investigates the influence of tungsten (W) external impurity on the physical-chemical and optoelectronic properties of CdO. The X-ray diffraction spectra reveal that the undoped and W-doped CdO polycrystalline thin films have cubic crystal structures with high texture along (111) and (200) orientations. An atomic force microscope was used to measure the roughness of CdO films (2.24 nm–7.40 nm). Concerning W-doping, the particle size varied from 64 nm to 104 nm. X-ray photoelectron spectroscopy was used to analyze the presence of elements and the nature of oxidation statuses (of Cd2+, O2−, and W5+). Hall measurements confirmed the n-type conductive nature, and the low resistivity (7.01 × 10−4 Ω cm) and high mobility (81 cm2/V. s) were attained for 0.25 wt% W-doped CdO thin film. The optical band gap of the film ranges from 2.38 eV to 2.45 eV, depending on the W-doping concentration. This variation can help tailor the optical behaviors of CdO films for precise applications. The average transmittance varies from 72 % to 87 %, indicating that the films can be used in highly transparent applications. The highest optoelectronic function (high figure of merit) was gained at 25 wt% W-doped CdO thin film (8.37 × 10−3 Ω−1). The 1.0 wt% W-doped CdO film shows a remarkable response to formaldehyde gas, with a sensitivity of 72.83 %. This suggests potential applications in gas sensing technologies. The optoelectronic characteristics of spray-deposited CdO thin film are improved by the surface morphological enhancement generated by the dopant. [Display omitted] • W-doped CdO thin films were fabricated utilizing a cost-effective chemical spray pyrolysis system. • A high mobility of 81 cm2/V. s is achieved. • Achieved is a high transmittance of 87 % and an improved optical band gap of 2.45 eV. • A significant figure of merit of 4.56 × 10−3 Ω−1 is achieved. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2025.10.239