Enhancement of optoelectronic parameters of Nd-doped ZnO nanowires for photodetector applications

Raj, I. Loyola Poul; Valanarasu, S.; Hariprasad, K.; Ponraj, Joice Sophia; Chidhambaram, N.; Ganesh, V.; Ali, H. Elhosiny; Khairy, Yasmin

doi:10.1016/j.optmat.2020.110396

Cited by 149 publications

(78 citation statements)

References 61 publications

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“…Doni Pon et al [56], reported Al doped ZnO thin film has the detectivity value in the order of 1.70 × 10 11 Jones. Poul Raj et al [57], demonstrated Nd doped ZnO thin films showed maximum detectivity value 1.18 × 10 11 Jones which is comparable to the present work. The external quantum efficiency (EQE) of the prepared thin films was determined by using the given relation:…”

Section: Photo-sensing Analysissupporting

confidence: 90%

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Ganesh,

Yahia,

Raj

et al. 2023

Phys. Scr.

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In the present work, Copper (Cu) doped zinc oxide (ZnO) nanoparticles were prepared using a simple and cost-effective co-precipitation process. The objectives of the proposed work are to identify the cause of Cu dopant on the crystalline structure, morphology, optical characteristics of ZnO nanoparticles for photocatalytic as well as photosensing applications. X-ray diffraction (XRD) and Field emission scanning electron microscope (FESEM) examinations were used to identify the crystal structure and morphology of the prepared samples. The crystallite size of the undoped ZnO sample was 44 nm, which gets reduced to 36 nm with 5% Cu-doping. Using diffuse reflectance spectroscopy (DRS), the band gap of prepared samples of undoped to 5wt% Cu doped ZnO was calculated, and it was found to be reduced from 3.31 to 3.26 eV. Photoluminescence (PL) spectra show a decrease in luminous intensity which is in line with the photocatalytic behavior. 5 wt% Cu doped ZnO sample displayed maximum degradation efficiency of 85% in 75 minutes and degradation rate of 0.02 min-1. Additionally, photo-sensing studies of the 5 wt. % Cu doped ZnO sample showed higher responsivity (R), detectivity (D*) and external quantum efficiency (EQE) values of 1.93  10-1 AW-1, 1.09  1011 Jones and 45 % respectively. The rise and fall time of 5 wt % Cu doped ZnO photodetector is in the order of 0.3 and 0.5 s.

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Section: Photo-sensing Analysissupporting

confidence: 90%

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Ganesh,

Yahia,

Raj

et al. 2023

Phys. Scr.

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“…The geopolymer bonds are highly stable up to 800°C. [92][93][94][95][96][97] Because of all of these reasons, the number of pores in synthetic geopolymers was significantly reduced. The acceleration of pore volume reduction and water loss in the geopolymer as a result of evaporation and dihydroxylation that occurs during a thermal assault can lead to the formation of structural faults or the expansion of existing faults.…”

Section: Microstructural Analysismentioning

confidence: 99%

Investigation on the impact of elevated temperature on sustainable geopolymer composite

Verma,

Meena,

Singh

et al. 2023

Advances in Mechanical Engineering

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Geopolymer concrete (GPC) is an eco-friendly, sustainable, cementless and green concrete. It could be an alternative to the conventional concrete. In alkaline circumstances, the alumina and silica concentration in geopolymer concrete creates the geopolymer bond, while regular concrete creates C-S-H (calcium silicate hydrate bond). The final result of the geopolymer bond does not include any water. At elevated temperatures, geopolymer concrete would thus be more stable. Due to its greater strength and durability quality, geopolymer concrete may be the ideal replacement for ordinary portland cement (OPC) concrete. This research intends to examine how specimens of geopolymer concrete and regular concrete respond to exposure to increased temperatures between 100°C and 800°C. Mass loss, ultrasonic pulse velocity, compressive strength, X-ray diffraction, thermogravimetric analysis and derivative thermogravimetric analysis were all examined throughout the experimental examination. Both concrete specimens lose mass or weight as the exposure temperature rises; OPC concrete samples spalls at 600°C, while GPC sample fail at 800°C. GPC specimens lose around 12% of their original mass after being exposed to temperatures of 800°C, while OPC specimens lose about 7%. The GPC specimens maintained 60% of their initial compressive strength after being exposed to a temperature of 700°C, but the OPC concrete specimens only kept 52%. With each increase in exposure to extreme temperatures, the peaks of quartz and cristobalite are lowered. Only the form or structure of the mineral oxide would change; the chemical linkages would remain. The GPC samples subjected to temperatures of 100°C exhibit effective thermal stability than all other specimens exposed to extreme temperatures. As the exposure temperature rises, the GPC specimens become more thermally stable. According to the experimental findings, the GPC specimens’ bonding structure makes them more resistant to high temperatures than regular concrete specimens. Micropores are present in the voids of the geopolymer matrix, while mesopores and micropores are present in the voids of the OPC matrix. While OPC bonding is C-S-H formed by the hydration of lime and silica contained in the cement, the geopolymer bonding did not include the water content in the final or end result of geopolymerisation for strengthening.

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“…The important characteristics for evaluating the performance of a photodetector device are photosensitivity (P s ), responsiveness (R * ), detectivity (D * ), and external quantum efficiency (EQE) [43,44]. The enhancement of current known as the photocurrent (I p ) is the difference between current under light and dark.…”

Section: Photoconductive Effectmentioning

confidence: 99%

Photo-response in chemically synthesized ZnSe nanorod for its application as photosensor

Handique,

Barman,

Kalita

2023

Phys. Scr.

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Zinc Selenide nanorods with varying concentration have been synthesized through the chemical bath deposition method. Concentration-dependent structural and electronic properties of synthesized ZnSe nanorods have been studied in this work. XRD and HRTEM studies indicate the formation of cubic polycrystalline ZnSe nanostructures. The effect of molar concentration, incident light intensity and wavelength on various parameters of fabricated ZnSe based photodetectors have been studied. The photocurrent and thereby other parameters such as photosensitivity, responsivity, detectivity and electron quantum efficiency are seen to decrease with the increase of Zn ion concentration. To investigate the fundamental nature of the dependency of photocurrent on light intensity, Rose’s model of photoconduction is used and the intensity-photocurrent characteristics exhibit sub linear nature. The parameters of ZnSe based photodetectors are calculated and correlated with molar concentration. The effects of incident light intensity and the wavelength on the photodetector properties of ZnSe photodetector are studied thoroughly in this paper.

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Enhancement of optoelectronic parameters of Nd-doped ZnO nanowires for photodetector applications

Cited by 149 publications

References 61 publications

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Investigation on the impact of elevated temperature on sustainable geopolymer composite

Photo-response in chemically synthesized ZnSe nanorod for its application as photosensor

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