Fabrication of Silicon Dioxide by Photo-Chemical Vapor Deposition to Decrease Detector Current of ZnO Ultraviolet Photodetectors

Young, Sheng-Joue; Liu, Yi Hsing; Chang, Shoou Jinn; Chiu, Chieh

doi:10.1021/acsomega.0c04136

Cited by 7 publications

(3 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, UV radiation generated abundant availability of electrons and holes at the sensor surface, thus it extended the width of the depletion layer and further reduced electrical resistance of the sensor. 63 The UV radiation enhanced overall gas sensing performance by lowering activation energy between H 2 gas and sensor surface. Recent advancements of ZnO/rGO based sensors for H 2 sensing applications are illustrated in Table I.…”

Section: Zno/rgo Ncs In Gas Sensing Applicationsmentioning

confidence: 99%

Review—Recent Advancements of ZnO/rGO Nanocomposites (NCs) for Electrochemical Gas Sensor Applications

Rumjit

Thomas

Lai

et al. 2021

J. Electrochem. Soc.

View full text Add to dashboard Cite

Zinc oxide (ZnO)/rGO (reduced graphene oxide) composites have recently gained much interest in electrochemical gas sensor devices due to their fascinating electrochemical properties such as active surface sites, high surface area to volume ratios and high carrier large mobility. ZnO is a significant gas sensing material due to its excellent response towards oxidizing/reducing gases, easy preparation, and less toxicity. At the same time, graphene oxide and reduced graphene oxide-based sensors exhibited high surface area, and the presence of surface functional groups facilitated gas sensing properties. The synergistic effect of ZnO/rGO improved sensing properties and binding stability with macromolecules, thus making them potential candidates for the design of gas sensor devices. However, the fabrication and utilization of gas sensors operating at the low-temperature condition is still a significant hurdle. This review encompasses the recent advancements of ZnO/rGO nanostructures synthesis, studying nanocomposite interactions in various gas sensing applications. This study also proposes future outlooks on the ZnO-rGO gas sensors high selectivity and sensitivity for gas detection at low working temperature.

show abstract

Section: Zno/rgo Ncs In Gas Sensing Applicationsmentioning

confidence: 99%

Review—Recent Advancements of ZnO/rGO Nanocomposites (NCs) for Electrochemical Gas Sensor Applications

Rumjit

Thomas

Lai

et al. 2021

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…In addition, the loose structure is not conducive to the transport of photogenerated carriers, which greatly limits the responsivity under illumination. On the other hand, defect-induced carriers widely exist in ZnO nanomaterials, and the resulting high dark current seriously impairs the performance of UV photodetectors, leading to unsatisfactory specific detectivity and on–off ratio. − Thus, challenges remain for fabricating ZnO-based UV photodetectors with both excellent optoelectronic properties and mechanical flexibility.…”

Section: Introductionmentioning

confidence: 99%

Sunscreen-Inspired ZnO/PEG Composites for Flexible Ultraviolet Photodetectors with a Giant On–Off Ratio

Yang

et al. 2023

ACS Photonics

View full text Add to dashboard Cite

Zinc oxide (ZnO) nanomaterials have attracted much attention in UV photodetectors owing to the suitable band gap and high photoelectric conversion efficiency. However, the loose structure of nanomaterials assembled by a low-temperature process cannot meet the mechanical requirements of flexible photodetectors. The high dark current caused by defects in ZnO severely drags down the response performance of photodetectors. To address these issues, we have proposed a novel strategy for constructing flexible photodetectors based on ZnO and poly(ethylene glycol) (PEG) composites. Inspired by the sunscreen, the addition of PEG can enhance the interaction of ZnO nanoparticles, thus improving the film-forming ability and the mechanical endurance of the composites. By coating the ZnO/PEG composite on a common printing paper, the flexible photodetector shows unexpected good performance, such as a high responsivity of 1.77 A·W–1 and a large specific detectivity of 3.89 × 1013 Jones. Notably, a giant on–off ratio of up to 1.99 × 105 has been achieved by suppression of dark current. The device also exhibits satisfactory mechanical flexibility after long-term bending tests. In addition, the low-cost raw materials and scalable manufacturing processes further expand its application prospects in flexible optoelectronic technologies.

show abstract

“…However, ZnO films have high electrical resistance, which hinders their practical application. (4)(5)(6)(7)(8)(9) Accordingly, the problem of improving the electrical performance of ZnO thin films through doping with metallic elements such as Al, Ga, Ag, Ti, Zr, and Mo has attracted significant attention in recent years. (10)(11)(12)(13)(14)(15) In such methods, the doped atoms substitute for the Zn atoms in the ZnO crystal structure and produce free electrons in the conduction band, which lower the electrical resistivity.…”

Section: Introductionmentioning

confidence: 99%

Optical and Electrical Properties of Mn-doped and Mn-Al co-doped ZnO Thin Films Annealed at Different Temperatures for Photosensor Applications

Yen¹,

Chen²,

Lai³

et al. 2021

Sensors and Materials

View full text Add to dashboard Cite

Mn-doped and Mn-Al co-doped zinc oxide (ZnO) thin films were deposited on glass substrates by RF magnetron sputtering at room temperature. The X-ray diffraction results revealed that both films consisted of a single phase and had a wurtzite structure with a c-axis orientation. The electrical properties, transmittance characteristics, surface properties, and crystal structures of the films were investigated following annealing at temperatures ranging from 200 to 500 °C. The results showed that the as-deposited Mn:ZnO thin film had an average transmittance of 83%. The transmittance increased to 85% following annealing at 500 °C. The as-deposited Mn-Al co-doped ZnO thin film had a low transmittance of only 40%. However, after annealing at 500 °C, the transmittance increased to 83%. The annealed Mn-Al:ZnO thin film also showed a low electrical resistivity of 1.75 × 10 −3 Ω•cm, an electron mobility of 20.8 cm 2 V −1 s −1 , and a carrier concentration of 5.3 × 10 20 cm −3 . Scanning electron microscopy (SEM) results showed that the crystal size of both thin films increased following annealing. Owing to their good optical and electrical properties, the annealed Mn-Al:ZnO thin films can be used as photosensor materials.

show abstract

Fabrication of Silicon Dioxide by Photo-Chemical Vapor Deposition to Decrease Detector Current of ZnO Ultraviolet Photodetectors

Cited by 7 publications

References 39 publications

Review—Recent Advancements of ZnO/rGO Nanocomposites (NCs) for Electrochemical Gas Sensor Applications

Review—Recent Advancements of ZnO/rGO Nanocomposites (NCs) for Electrochemical Gas Sensor Applications

Sunscreen-Inspired ZnO/PEG Composites for Flexible Ultraviolet Photodetectors with a Giant On–Off Ratio

Optical and Electrical Properties of Mn-doped and Mn-Al co-doped ZnO Thin Films Annealed at Different Temperatures for Photosensor Applications

Contact Info

Product

Resources

About