Fastly steady UV response feature of Mn-doped ZnO thin films

Xie, Qingshuang; Liu, Xing; Liu, Hong

doi:10.1016/j.spmi.2020.106391

Cited by 11 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An increase in excitation wavelength (from 370 to 394 nm) leads to decrease in value of the UV response due to several competing factors (decreasing energy of absorbed photons, increasing absorption coefficient of material) [27].…”

Section: Resultsmentioning

confidence: 99%

ANNEALING EFFECT ON UV DETECTION PROPERTIES OF ZnO:Al STRUCTURES

Nagpal,

Chiriac,

Sereacov

et al. 2024

J. Eng. Sci.

View full text Add to dashboard Cite

The aim of this study was to develop low-powered, highly selective UV sensor to continuously monitor personalized UV exposure as well as to study annealing effect on UV detection properties of the sensors. ZnO:Al structures were obtained by chemical growth method followed by thermal annealing at 625 °C for 2 h. The studied samples exhibit maximal UV response of 620/488 at 25 °C/50 °C to 370 nm UV radiation before/after annealing, respectively. Thermal annealing of sensor (250 °C for 1 h) led to improvement in fall time from 3860 seconds to 262 seconds at 25 °C and highest responsivity (~48 mA/W) came out for 370 nm wavelength at 75 °C operating temperatures. Consequently, excellent selectivity for 370 nm UV illumination can be ascribed as due to thermal annealing effect which increases the crystallinity, grain size, and roughness of the sensing film. The PL measurements reveals the suppression of structural defects, increase in intensity after annealing and enhanced UV response due to presence of Al content in films. Overall, these structures showed magnificent UV properties, before and especially after additional thermal annealing. UV sensing mechanism of such nanomaterial-based sensor were explained with physio-chemical processes take place on the surface of these structures. The obtained results on annealed ZnO:Al films-based devices is superior to reported performances of other nanostructures, proving new results for UV sensing applications at different operating temperatures in various fields.

show abstract

Section: Resultsmentioning

confidence: 99%

ANNEALING EFFECT ON UV DETECTION PROPERTIES OF ZnO:Al STRUCTURES

Nagpal,

Chiriac,

Sereacov

et al. 2024

J. Eng. Sci.

View full text Add to dashboard Cite

show abstract

“…where 𝛼 is the absorption coefficient which depends upon the thickness of the film, ℎ is the Planck constant, 𝐴 is proportionality constant, and 𝑛 = 1 2 ⁄ for direct bandgap semiconductors. The absorption coefficient can be estimated by using [43],…”

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Optical Properties of Mn2+ Doping in ZnO Thin Films

et al. 2021

View full text Add to dashboard Cite

MnxZn1−xO thin films (x = 0%, 1%, 3%, and 5%) were grown on corning glass substrates using sol–gel technique. Single-phase hexagonal wurtzite structure was confirmed using X-ray diffraction. Raman analysis revealed the presence of Mn content with an additional vibrational mode at 570 cm−1. The surface morphology of the samples was observed by scanning electron microscopy which suggested that the grain size increases with an increase in Mn concentration. The optical bandgap increases with increasing Mn concentration due to a significant blueshift in UV–visible absorption spectra. The alteration of the bandgap was verified by the I–V measurements on ZnO and Mn-ZnO films. The various functional groups in the thin films were recorded using FTIR analysis. Magnetic measurements showed that MnxZn1−xO films are ferromagnetic, as Mn induces a fully polarised state. The effect of Mn2+ ions doping on MnxZn1−xO thin films was investigated by extracting various parameters such as lattice parameters, energy bandgap, resistivity, and magnetisation. The observed coercivity is about one-fifth of the earlier published work data which indicates the structure is soft in nature, having less dielectric/magnetic loss, and hence can be used as ultra-fast switching in spintronic devices.

show abstract

“…[ 86 ] Furthermore, the optical properties can be controlled through the structural control of the ZnO lattice by doping with appropriate metal ions. [ 65,87,88 ]…”

Section: Classification Of Uvc Photodetectorsmentioning

confidence: 99%

“…[86] Furthermore, the optical properties can be controlled through the structural control of the ZnO lattice by doping with appropriate metal ions. [65,87,88] Various ZnO nanomaterials, such as nanorods, [89,90] nanobelts, [91,92] and nanoparticles, [93] have been used to improve the performance of UV detectors. Nanostructures exhibit efficient photoconduction compared to that of bulk or thin films owing to their large surface-to-volume ratio.…”

Section: Wide-bandgap Materialsmentioning

confidence: 99%

Recent advances in self‐powered and flexible UVC photodetectors

et al. 2022

View full text Add to dashboard Cite

Ultraviolet-C (UVC) radiation is employed in various applications, including irreplaceable applications in military and civil fields, such as missile guidance, flame detection, partial discharge detection, disinfection, and wireless communication. Although most modern electronics are based on Si, UVC detection technology remains a unique exception because the short wavelength of UV radiation makes efficient detection with Si difficult. In this review, recent challenges in obtaining ideal UVC photodetectors with various materials and various forms are introduced. An ideal photodetector must satisfy the following requirements: high sensitivity, fast response speed, high on/off photocurrent ratio, good regional selectivity, outstanding reproducibility, and superior thermal and photo stabilities. UVC detection is still in its infancy compared to the detection of UVA as well as other photon spectra, and recent research has focused on different key components, including the configuration, material, and substrate, to acquire battery-free, super-sensitive, ultra-stable, ultra-small, and portable UVC photodetectors. We introduce and discuss the strategies for fabricating self-powered UVC photodetectors on flexible substrates in terms of the structure, material, and direction of incoming radiation. We also explain the physical mechanisms of self-powered devices with various architectures. Finally, we present a brief outlook that discusses the challenges and future strategies for deep-UVC photodetectors. K E Y WO R D Sphoto-absorber, photoconductor, responsivity, UV radiation  INTRODUCTIONUltraviolet (UV) radiation is an ordinary component of solar radiation. Although it accounts for less than 10% of the total sunlight, UV radiation has a severe influence on humanity. The International Commission on Illumination (CIE) divides the spectrum of solar electromagnetic radiation into three bands, as shown in Figure 1: UVA (315-400 nm), UVB (280-315 nm), and UVC (100-280 nm). [1] Among them, UVA and UVB are mainly derived from the natural environment. They account for 90%-95% and 5%-10% of solar radiation, respectively, and are of the part of sunlight that leads to sunburn, skin cancers, and cataracts. [2][3][4][5] Until now, many photodetectors, which detect UV radiation with wavelengths longer than 280 nm, have been integrated into weather forecast programs to prevent UVA andThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Fastly steady UV response feature of Mn-doped ZnO thin films

Cited by 11 publications

References 29 publications

ANNEALING EFFECT ON UV DETECTION PROPERTIES OF ZnO:Al STRUCTURES

ANNEALING EFFECT ON UV DETECTION PROPERTIES OF ZnO:Al STRUCTURES

Structural, Magnetic, and Optical Properties of Mn2+ Doping in ZnO Thin Films

Recent advances in self‐powered and flexible UVC photodetectors

Contact Info

Product

Resources

About