The effect of alpha particle irradiation on electrical properties and defects of ZnO thin films prepared by sol-gel spin coating

Ahmed, Mohsin; Taghizadeh, Fatemeh; Auret, F.D.; Meyer, W.E.; Nel, Jackie M.

doi:10.1016/j.mssp.2019.05.029

Cited by 13 publications

(6 citation statements)

References 147 publications

(277 reference statements)

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“…A direct allowed transitions energy band gap of value of 1.18 eV and 2.53 eV are identified for silicon and magnesium selenide, respectively. These values are consistent with literature data where a value of 1.20 eV [15] is reported forn Si and a band gap value of 2.53 eV is reported for MgSe [6]. The work function ofn Si is 4.25 eV [16].…”

Section: Resultssupporting

confidence: 92%

Ag/n–Si/p–MgSe/(Ag, C, Au, Pt) devices designed as current rectifiers, photodetectors and as ac signal filters suitable for VLC, IR and 6G technologies

2022

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Herein the fabrication and practical applications of p-MgSe thin films as active p-layer of electronic devices are reported. MgSe films are prepared by a vacuum evaporation technique onto n-Si substrates under a vacuum pressure of 10-5 mbar. The films are morphologically, structurally, electrically and opto-electronically investigated. Having identified the work function of p-MgSe as 6.74 eV, the role of Ag, C, Au and Pt metal contacts on the performance of the n-Si/p-MgSe (SM) diodes are studied. It is observed that high rectification ratios of ~104 and 102 are achieved at an applied voltage of 3.0 V for the Ag/SM/C and Ag/SM/Ag diode structures, respectively. In addition, a current responsivity to visible and infrared light of ~0.70 A/W is observed for the Ag/SM/Ag channels. The noise equivalent ratios, the external quantum efficiency and the detectivity of the Ag/SM/Ag diodes suit requirements of visible light and infrared communication detectors. Moreover, studies of the capacitance-voltage characteristics showed capacitor characteristics. The depleting of the Ag/SM/Ag capacitors is possible up to 50 MHz. Furthermore, analyzing the capacitance, resistance and cutoff frequency spectra have shown that the Ag/SM/Ag device channels can perform as negative resistance sources with cutoff frequency values that suits 6G technology requirements

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Section: Resultssupporting

confidence: 92%

Ag/n–Si/p–MgSe/(Ag, C, Au, Pt) devices designed as current rectifiers, photodetectors and as ac signal filters suitable for VLC, IR and 6G technologies

2022

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“…The XRD analysis also revealed that the irradiated ZnO films were still in the crystalline phase and in good homogeneity. The grain size of the deposited ZnO thin films can be calculated using Scherrer equation 1 [ 21] :…”

Section: Results and Discussion X-ray Diffraction (Xrd) Measurementmentioning

confidence: 99%

Irradiation Effects on The Sensitivity of ZnO Thin Films Synthesized on Glass Substrate by Sol-gel Method

Kasim

Ali

Younus

2021

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This work investigates the structural, optical, and surface properties of ZnO thin films prepared by sol-gel method. The effect on waveguide sensor was examined at different irradiation durations of alpha particles. The X-ray diffraction (XRD) measurements revealed that the crystalline phase of ZnO thin films does not change after irradiation and showed a hexagonal structure of wurtzite type with an orientation toward (002). Moreover, ZnO thin films absorbance was increased with increasing irradiation time, whereas the transmittance was decreased. Additionally, increasing the irradiation time of alpha particles caused an increase in the extinction coefficient and the imaginary part, while the optical energy gap of the ZnO samples was decreased. Finally, the maximum value of sensitivity was 42%, found at 6 min of irradiation duration.

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“…Furthermore, the overall aim of our work is to enable decentralised manufacture of sensors and microsystems with facile and low-cost processes for use in point-of-need applications. Towards the employment of custom gas sensors in such an e-nose microsystem, three custom gas sensors were fabricated via screen printing using ZnO nanoparticles that were prepared using the sol-gel [45,46] method, as well as with a printable off-the-shelf ZnO particulate solution. The custom screen-printed ZnO sensors are operated at much lower power than the commercial sensors used in our low-cost e-nose by utilising UV radiation, rather than heating, to activate the ZnO layers for gas sensing.…”

Section: Discussionmentioning

confidence: 99%

“…The latest techniques for deposition are electrohydrodynamic (EHD) [42], microextrusion [43] and roll-to-roll gravure printing [44] for upscaling to mass manufacturing. By using chemical solutions like the sol-gel method [45,46] to prepare metal oxide nanoparticles, it is also possible for the films to be doped and the dopant is distributed uniformly throughout the thin film. Deposition using chemical solutions minimises the processing costs of the films used for the gas sensors using these techniques mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…The first ZnO solution was prepared by dissolving zinc acetate dihydrate (Saarchem UnivAR, Mumbai, India) in isopropanol (ACE Platinum line (AR), Johannesburg, South Africa) [45]. Monoethanolamine (MEA) (ACE Gold line (CP), Johannesburg, South Africa) was added to the solution, maintaining a molar ratio of MEA to zinc acetate dihydrate of 1.0 and the concentration of zinc acetate of 0.5 M. All precursors were used as received, without further processing.…”

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confidence: 99%

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Insecticide Monitoring in Cattle Dip with an E-Nose System and Room Temperature Screen-Printed ZnO Gas Sensors

2023

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Taktic, an Amitraz-based insecticide, is commonly used in sub-Saharan Africa to treat cattle for ticks. Due to misuse in rural dipping pools, some ticks are showing resistance to Taktic. This work presents a low-cost e-nose with commercial sensors to monitor Taktic levels in dipping pool water. The device shows distinctly different measurements for the odours of air, distilled water, farm water, and four levels of Taktic insecticide in farm water. A naive Bayes algorithm with a Gaussian distribution is trained on the data and a validation set achieves a 96.5% accuracy. This work also compares two sol-gel ZnO nanoparticle solutions with an off-the-shelf ZnO nanoparticle ink for use as active material in chemiresistive gas sensors to be employed in an e-nose array. The ZnO solutions are screen-printed onto gold electrodes, auto-sintered with a built in heater, and used with UV illumination to operate as low-power, room temperature gas sensors. All of the screen-printed ZnO sensors show distinct changes in resistance when exposed to Taktic vapours under room temperature and humidity conditions. The custom room temperature ZnO gas sensors fabricated via facile and low-cost processes are suitable for future integration in a point-of-need microsystem for the detection of Taktic in water.

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The effect of alpha particle irradiation on electrical properties and defects of ZnO thin films prepared by sol-gel spin coating

Cited by 13 publications

References 147 publications

Ag/n–Si/p–MgSe/(Ag, C, Au, Pt) devices designed as current rectifiers, photodetectors and as ac signal filters suitable for VLC, IR and 6G technologies

Ag/n–Si/p–MgSe/(Ag, C, Au, Pt) devices designed as current rectifiers, photodetectors and as ac signal filters suitable for VLC, IR and 6G technologies

Irradiation Effects on The Sensitivity of ZnO Thin Films Synthesized on Glass Substrate by Sol-gel Method

Insecticide Monitoring in Cattle Dip with an E-Nose System and Room Temperature Screen-Printed ZnO Gas Sensors

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