UV-photodetector based on heterostructured ZnO/(Ga,Ag)-co-doped ZnO nanorods by cost-effective two-step process

Kumar, Amit; Li, Xuejin; Du, Yu; Geng, Yanquan; Hong, Xueming

doi:10.1016/j.apsusc.2019.144770

Cited by 30 publications

(9 citation statements)

References 46 publications

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“…The use of codoped ZnO as a photodetector was also studied in depth by GuruSampath et al 84 The heterostructured ZnO/Ga–Ag codoped ZnO nanorod material was synthesized by the two-step process, sol–gel-assisted hydrothermal approach. A slight lower angle shift was observed in the XRD pattern of the codoped material, which makes it confusing to interpret the effect based on the ionic radii because Ga( iii ) has a smaller ionic radius (0.62 Å) than Zn( ii ) (0.74 Å) and Ag( i ) has a greater radius (1.02 Å) than zinc ion.…”

Section: Dopant–host Reactivity Balancesmentioning

confidence: 99%

Insights into ZnO-based doped porous nanocrystal frameworks

Abebe

Murthy

2022

RSC Adv.

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Section: Dopant–host Reactivity Balancesmentioning

confidence: 99%

Insights into ZnO-based doped porous nanocrystal frameworks

Abebe

Murthy

2022

RSC Adv.

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“…Hence, the 2p 3/2 peak experienced larger displacement as compared to the 2p 1/2 peak, resulting in higher energy of shifting (from approximate 22.9 in FZO to approximate 23.13 in FAZO) which could be attributed to the greater spin-orbital interaction in the FAZO sample which is around the characteristic value of ZnO (Krajian et al , 2021). Also, Figure 4(b) shows that the F 1 s peak shifted from 684.2 in FZO to 684.7 eV in FAZO with the approximate 0.5 eV BE shifting, indicating the binding of F with the Zn and F with the Ag (GuruSampath Kumar et al , 2020; Wang et al , 2018). Figure 4(c) shows that the Ag 3d 5/2 and Ag 3d 3/2 peaks were located at 367.8 and 373.7 eV, respectively, in the FAZO sample (GuruSampath Kumar et al , 2020).…”

Section: Resultsmentioning

confidence: 98%

Fabrication of fluorine and silver co-doped ZnO photodetector using modified hydrothermal method

Muhammad

Mohammad

Hassan

et al. 2022

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Purpose The purpose of this study is to dope silver (Ag) and fluorine (F) in zinc oxide (ZnO) for the enhancement of electrical and optical properties of ZnO, as previous studies reported the improvement of these properties using individual doping of F and Ag. In this paper, F and Ag co-doped ZnO nanorods were synthesized using a modified hydrothermal method. Design/methodology/approach The hydrothermal method was modified and used for the synthesis of the doped ZnO nanostructures, where stainless autoclave and oven were replaced with the Duran laboratory bottle and water boiler system in the process. The ultraviolet metal-semiconductor-metal photodetector (PD) was fabricated using DC sputtering method. Findings Vertically aligned nanorods images were captured from field emission scanning electron microscopy. XPS analysis confirmed greater spin-orbital interaction in the F and Ag co-doped ZnO sample and revealed the presence of F, Ag, Zn and O in the samples, indicating a successful doping process. X-ray diffraction revealed a hexagonal wurtzite structure with enhanced crystal quality upon co-doping. The bandgap decreased from 3.19 to 3.14 eV upon co-doping because of reduced defects density in the sample. Finally, an ultra-violet PD was fabricated with enhanced sensitivity and response times upon co-doping. Originality/value The low-cost, less energy-consuming Duran laboratory bottle and water boiler system were used as the substitute of expensive, more energy-consuming stainless autoclave and oven in a hydrothermal method for synthesis of F and Ag co-doped ZnO and subsequent fabrication of PD.

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“…The morphologies of thin films are affected by adding Ag + , which may be replaced with Zn 2+ . Further increase in impurities caused the agglomeration of Ag atoms at the grain boundary of ZnO crystal, suggesting the creation of Ag clusters that appeared as separate Ag atoms, as can be seen in Figure 3c,d [46]. Energy-dispersive X-ray (EDX) spectroscopy was used to evaluate the chemical compositions of pristine ZnO and Ag-doped nanorods.…”

Section: Structural Morphological and Chemical Composition Investigat...mentioning

confidence: 99%

Development of Ag-Doped ZnO Thin Films and Thermoluminescence (TLD) Characteristics for Radiation Technology

et al. 2022

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This work examined the thermoluminescence dosimetry characteristics of Ag-doped ZnO thin films. The hydrothermal method was employed to synthesize Ag-doped ZnO thin films with variant molarity of Ag (0, 0.5, 1.0, 3.0, and 5.0 mol%). The structure, morphology, and optical characteristics were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), photoluminescence (PL), and UV–vis spectrophotometers. The thermoluminescence characteristics were examined by exposing the samples to X-ray radiation. It was obtained that the highest TL intensity for Ag-doped ZnO thin films appeared to correspond to 0.5 mol% of Ag, when the films were exposed to X-ray radiation. The results further showed that the glow curve has a single peak at 240–325 °C, with its maximum at 270 °C, which corresponded to the heating rate of 5 °C/s. The results of the annealing procedures showed the best TL response was found at 400 °C and 30 min. The dose–response revealed a good linear up to 4 Gy. The proposed sensitivity was 1.8 times higher than the TLD 100 chips. The thermal fading was recorded at 8% for 1 Gy and 20% for 4 Gy in the first hour. After 45 days of irradiation, the signal loss was recorded at 32% and 40% for the cases of 1 Gy and 4 Gy, respectively. The obtained optical fading results confirmed that all samples’ stored signals were affected by the exposure to sunlight, which decreased up to 70% after 6 h. This new dosimeter exhibits good properties for radiation measurement, given its overgrowth (in terms of the glow curve) within 30 s (similar to the TLD 100 case), simple annealing procedure, and high sensitivity (two times that of the TLD 100).

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UV-photodetector based on heterostructured ZnO/(Ga,Ag)-co-doped ZnO nanorods by cost-effective two-step process

Cited by 30 publications

References 46 publications

Insights into ZnO-based doped porous nanocrystal frameworks

Insights into ZnO-based doped porous nanocrystal frameworks

Fabrication of fluorine and silver co-doped ZnO photodetector using modified hydrothermal method

Development of Ag-Doped ZnO Thin Films and Thermoluminescence (TLD) Characteristics for Radiation Technology

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