Enhancement of optoelectronic properties of ZnO thin films by Al doping for photodetector applications

Pon, V. Doni; Wilson, K. S. Joseph; Hariprasad, K.; Ganesh, V.; Ali, H. Elhosiny; Algarni, H.; Yahia, I.S.

doi:10.1016/j.spmi.2020.106790

Cited by 144 publications

(65 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, a key issue with pristine ZnO (also with most wide-band-gap metal oxides) is that it can work for ultraviolet (UV) photodetection, as allowed by its wide-band-gap structure, while many areas require a photosensor which can detect visible light. Several past research works stated that doping of various transition metals in ZnO can tune its optical and optoelectronic properties. , The doping of cations like Al 3+ , Cu 2+ , Cu + , Ga 3+ , In + , Ag + , Mg 2+ , Mn 2+ , Ni 2+ , Co 2+ , Eu 3+ , and Tb 3+ effectively modify the electro-optical, morphological, magnetic, and chemical properties of ZnO-based thin films. – Due to its advantageous characteristics, including low cost, natural abundance, high conductivity, and outstanding luminescence activation in II–VI compounds, copper is an efficient dopant which creates the p-type ZnO semiconductor. – Also, the doping of copper forms deep acceptor states (electron traps) within the ZnO, which increases the electrical resistivity of the ZnO thin films . The increase in resistivity reduces the background carrier concentration, lowers the dark current, and hence improves the photosensitivity of ZnO-based photodetectors (η = I photo – I dark / I dark ). , …”

Section: Introductionmentioning

confidence: 99%

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Singh,

Ambedkar,

Tyagi

et al. 2023

ACS Omega

View full text Add to dashboard Cite

Photodetection plays an essential role in the visiblelight zone and is important in modern science and technology owing to its potential applications in various fields. Fabrication of a stable photodetector remains a challenge for researchers. We demonstrated a high-response/recovery and self-powered undoped ZnO (UZO) and Cu-doped ZnO (CZO) thin film-based visible-light photodetector fabricated on a cost-effective Si substrate using reactive cosputtering. The structural, morphological, and optical properties of CZO and UZO thin films have been examined using X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and photoluminescence spectroscopy. The results of the CZO/n-Si photodetector compared with those of the undoped ZnO (UZO)/n-Si photodetector show that the CZO/n-Si exhibits a higher on/off ratio, responsivity, and detectivity than UZO/n-Si. Also, the CZO/ n-Si photodetector shows high stability and reproducibility over 20 cycles after 180 days. A relative study of CZO/n-Si-and UZO/n-Si-based photodetectors reveals the enhanced performance of the CZO/n-Si photodetector, which has a high on/off ratio of ∼300 with a high specific detectivity of 2.8 × 10 10 Jones for 75 mW visible light. The prepared self-powered CZO/n-Si/Ag thin film-based visible-light photodetector paves the way for the development of high-performance photodetector designs.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Singh,

Ambedkar,

Tyagi

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…18 Apart from these, the basic structural and morphological properties of the produced materials can be kept under control by adjusting the film growth conditions, so that the grown films gain the necessary functionality for certain applications. 19,20 In addition, there are some studies in the literature on the production of ZnO nanorods by the spray pyrolysis method. [21][22][23][24] The doping operation takes place in the form of the substitution of the doping ions with Zn 2+ ions which are in the ZnO crystal.…”

Section: Introductionmentioning

confidence: 99%

“…Its advantages are that it is low cost, fast, simple, and does not require a vacuum 18 . Apart from these, the basic structural and morphological properties of the produced materials can be kept under control by adjusting the film growth conditions, so that the grown films gain the necessary functionality for certain applications 19,20 . In addition, there are some studies in the literature on the production of ZnO nanorods by the spray pyrolysis method 21–24 …”

Section: Introductionmentioning

confidence: 99%

Fabrication and investigation of zinc oxide nanorods doped with molybdenum via ultrasonic spray pyrolysis

Çolak

Karaköse

2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Molybdenum ions with high valence states (Mo6+) can contribute to electrical conductivity and optical transmittance. For this reason, zinc oxide (ZnO) nanorods doped with molybdenum metal were fabricated on a glass substrate by ultrasonic spray pyrolysis method. The doping concentrations were between 0–10 mol%. The crystallographic properties of the resulting ZnO samples were examined by the X‐ray diffraction (XRD) technique. According to the XRD analysis, it was found that the lattice structure of the samples belonged to the hexagonal (wurtzite) unit cell. The XRD results indicated that the crystals grow in the c‐axis (002) direction. The morphological features of the obtained thin films were studied by field emission scanning electron microscopy. The energy‐dispersive X‐ray spectroscopy results displayed that the Mo ions were in the ZnO lattice. Four point probe method was used to determine the electrical conductivity properties of the samples. The 10% mol doped sample has the highest conductivity with values of between 1.58 × 10−9 and 1.58 × 10−6 (ohm‐cm)−1. The optical transmittances of the samples were measured at wavelengths between 300 and 1000 nm. It was observed that the produced films had high optical transparency which was approximately 85%.

show abstract

“…These elements present excellent physicochemical properties based on the electronic transitions occurring within the 4f energy shell [ 16 ]. As a result, their high conductivity, magnetic, electrochemical, and luminescent properties enabled their effective use as photocatalysts [ 17 ], photodetectors [ 18 ], Schottky diodes [ 19 ], and UV detectors [ 20 ], to cite only a few. Moreover, rare-earth compounds have been proved as promising candidates for improving gas sensing performance owing to their catalytic nature, fast oxygen ion mobility, and high surface basicity [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Dysprosium Doped Zinc Oxide for NO2 Gas Sensing

Fidha

Bitri

Mahjoubi

et al. 2022

Sensors

View full text Add to dashboard Cite

Pure and dysprosium-loaded ZnO films were grown by radio-frequency magnetron sputtering. The films were characterized using a wide variety of morphological, compositional, optical, and electrical techniques. The crystalline structure, surface homogeneity, and bandgap energies were studied in detail for the developed nanocomposites. The properties of pure and dysprosium-doped ZnO thin films were investigated to detect nitrogen dioxide (NO2) at the ppb range. In particular, ZnO sensors doped with rare-earth materials have been demonstrated as a feasible strategy to improve the sensitivity in comparison to their pure ZnO counterparts. In addition, the sensing performance was studied and discussed under dry and humid environments, revealing noteworthy stability and reliability under different experimental conditions. In this perspective, additional gaseous compounds such as ammonia and ethanol were measured, resulting in extremely low sensing responses. Therefore, the gas-sensing mechanisms were discussed in detail to better understand the NO2 selectivity given by the Dy-doped ZnO layer.

show abstract

Enhancement of optoelectronic properties of ZnO thin films by Al doping for photodetector applications

Cited by 144 publications

References 68 publications

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Fabrication and investigation of zinc oxide nanorods doped with molybdenum via ultrasonic spray pyrolysis

Dysprosium Doped Zinc Oxide for NO2 Gas Sensing

Contact Info

Product

Resources

About