Morphology Effect of the ZnO Surface via Organic Etchants for Photon Extraction in III-Nitride Emitters

Oh, Semi; Kim, S.; Shin, Soon-Cheol; Su, Pei-Chen; Yoon, Young-Gui; Lee, K. J.; Kim, S.-J.; Choi, Hee‐Jung; Park, S.-J.; Kim, K.-K.

doi:10.1149/2.0131701jss

Cited by 6 publications

(1 citation statement)

References 25 publications

(31 reference statements)

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“…In recent years, nanostructured semiconducting metal oxides such as SnO 2 , ZnO, TiO 2 , and CuO have been widely used to fabricate gas sensors because of their unique structure and surface-to-volume ratio compared to layered materials [4][5][6]. Among them, ZnO is largely utilized for the realization of various nanostructures, including nanorods (NRs), nanotubes (NTs), nanowires (NWs), nanowalls, and nanoflowers [7][8][9][10]. In particular, the different morphologies of ZnO NRs significantly affect the detection property of NO 2 gas sensors [11]; moreover, ZnO NRs-based sensors have a very low detection limit (10 ppm) for NO 2 gas at 250 • C, along with short response and recovery times [12].…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet Photoactivated Room Temperature NO2 Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO2 Nanoparticles

et al. 2020

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Prolonged exposure to NO2 can cause lung tissue inflammation, bronchiolitis fibrosa obliterans, and silo filler’s disease. In recent years, nanostructured semiconducting metal oxides have been widely used to fabricate gas sensors because of their unique structure and surface-to-volume ratio compared to layered materials. In particular, the different morphologies of ZnO-based nanostructures significantly affect the detection property of NO2 gas sensors. However, because of the large interaction energy of chemisorption (1–10 eV), metal oxide-based gas sensors are typically operated above 100 °C, overcoming the energy limits to attain high sensitivity and fast reaction. High operating temperature negatively affects the reliability and durability of semiconductor-based sensors; at high temperature, the diffusion and sintering effects at the metal oxide grain boundaries are major factors causing undesirable long-term drift problems and preventing stability improvements. Therefore, we demonstrate NO2 gas sensors consisting of ZnO hemitubes (HTs) and nanotubes (NTs) covered with TiO2 nanoparticles (NPs). To operate the gas sensor at room temperature (RT), we measured the gas-sensing properties with ultraviolet illumination onto the active region of the gas sensor for photoactivation instead of conventional thermal activation by heating. The performance of these gas sensors was enhanced by the change of barrier potential at the ZnO/TiO2 interfaces, and their depletion layer was expanded by the NPs formation. The gas sensor based on ZnO HTs showed 1.2 times higher detection property than those consisting of ZnO NTs at the 25 ppm NO2 gas.

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Section: Introductionmentioning

confidence: 99%

Ultraviolet Photoactivated Room Temperature NO2 Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO2 Nanoparticles

et al. 2020

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Surface-Modified Co-doped ZnO Photoanode for Photoelectrochemical Oxidation of Glycerol

et al. 2021

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Effects of surface morphology on the optical and electrical properties of Schottky diodes of CBD deposited ZnO nanostructures

Mwankemwa

Akinkuade

Maabong

et al. 2018

Physica B: Condensed Matter

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We report on effect of surface morphology on the optical and electrical properties of chemical bath deposited Zinc oxide (ZnO) nanostructures. ZnO nanostructures were deposited on the seeded conducting indium doped tin oxide substrate positioned in three different directions in the growth solution. Field emission scanning electron microscopy was used to evaluate the morphological properties of the synthesized nanostructures and revealed that the positioning of the substrate in the growth solution affects the surface morphology of the nanostructures. The optical absorbance, photoluminescence and Raman spectroscopy of the resulting nanostructures are discussed. The electrical characterization of the Schottky diode such as barrier height, ideality factor, rectification ratios, reverse saturation current and series resistance were found to depend on the nanostructures morphology. In addition, current transport mechanism in the higher forward bias of the Schottky diode was studied and space charge limited current was found to be the dominant transport mechanism in all samples.

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Morphology Effect of the ZnO Surface via Organic Etchants for Photon Extraction in III-Nitride Emitters

Cited by 6 publications

References 25 publications

Ultraviolet Photoactivated Room Temperature NO2 Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO2 Nanoparticles

Ultraviolet Photoactivated Room Temperature NO2 Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO2 Nanoparticles

Surface-Modified Co-doped ZnO Photoanode for Photoelectrochemical Oxidation of Glycerol

Effects of surface morphology on the optical and electrical properties of Schottky diodes of CBD deposited ZnO nanostructures

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