Effect of oxygen plasma treatment on the performance of recessed AlGaN/GaN Schottky barrier diodes

Abstract The treatment effect of the oxygen plasma on the performance of recessed AlGaN/GaN Schottky barrier diodes has been investigated. After the oxygen plasma treatment, the turn-on voltage and reverse leakage current are slightly changed, while the current collapse could be effectively mitigated. The X-ray photoelectron spectroscopy results suggest that a thin surface oxide layer is formed by the oxygen plasma treatment, which is responsible for the reduced current collapse. In addition, the device with oxygen plasma treatment has a relatively more inhomogeneous barrier height.

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Oxygen Plasma Treatment of Fluorinated Polyimide: An X-Ray Photoelectron Spectroscopy Study

Metallized Plastics 3 ◽

10.1007/978-1-4615-3416-7_18 ◽

1992 ◽

pp. 215-223 ◽

Cited By ~ 1

Author(s):

Naresh C. Saha ◽

Li-Hsin Chang

Keyword(s):

Plasma Treatment ◽

Photoelectron Spectroscopy ◽

Oxygen Plasma ◽

Oxygen Plasma Treatment ◽

Spectroscopy Study ◽

X Ray ◽

Fluorinated Polyimide

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Spectroscopic Analyses of Sputtered Aluminum Oxide Films with Oxygen Plasma Treatments

Materials Science Forum ◽

10.4028/www.scientific.net/msf.947.96 ◽

2019 ◽

Vol 947 ◽

pp. 96-100

Author(s):

Chatpawee Hom-On ◽

Mati Horprathum ◽

Pitak Eiamchai ◽

Sakson Limwichean ◽

Viyapol Patthanasetakul ◽

...

Keyword(s):

Aluminum Oxide ◽

Plasma Treatment ◽

Photoelectron Spectroscopy ◽

Oxygen Plasma ◽

Oxide Films ◽

Oxygen Plasma Treatment ◽

Lower Plasma ◽

Spectroscopic Analyses ◽

Effect Of Oxygen ◽

Deposited Films

X-ray photoelectron spectroscopy (XPS) and Spectroscopic Ellipsometry (SE) were used to analyse the effect of oxygen plasma treatment on properties of aluminum oxide thin films. The aluminum oxide films were fabricated using a reactive sputtering system. The as-deposited films were treated with oxygen plasma powered by an RF generator. During the plasma treatment, the pressures were set at 1 x 10-1 to 1x 10-2 mbar, while the RF supplied powers at 100 W and 200 W. It was observed that lower plasma powers and higher pressures resulted in smoother films. The O/Al ratio of the films were found to decrease with increasing plasma powers and pressures. The thickness and refractive index of the films were significantly affected by the oxygen plasma treatment process, which could be related to the change in films’ packing density and the etching at the surface.

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The Amorphization of Monolayer MoS2 Induced by Strong Oxygen Plasma Treatment

Materials Science ◽

10.5755/j01.ms.26.2.21576 ◽

2019 ◽

Vol 26 (2) ◽

pp. 143-146

Author(s):

Jian-Ling MENG ◽

Jian-Qi ZHU ◽

Shun-Tian JIA ◽

Xiao REN

Keyword(s):

Visible Light ◽

Plasma Treatment ◽

Raman Spectra ◽

Photoelectron Spectroscopy ◽

Oxygen Plasma ◽

Oxygen Plasma Treatment ◽

Visible Light Photocatalysis ◽

Monolayer Mos2 ◽

X Ray ◽

Raman Modes

By strong oxygen plasma treatment on monolayer MoS2, we observe the disappearance of the Raman modes of MoS2. We propose the hypothesis that the state of MoS2 translates from crystal to amorphous after strong oxygen plasma treatment. The evidences of no MoO3 formation shown by Raman spectra and the appearance of the Mo6+ peak and decreased O concentration shown by X-ray photoelectron spectroscopy support our hypothesis. The amorphization of monolayer MoS2 is further confirmed by the quenching of photoluminescence (PL) and the disappearance of two absorption peaks related to A, B exciton which demonstrates the disordered bandgap. Finally, we found that the amorphous MoS2 can improve the absorption fraction at the visible light (500~ 750 nm) which is potential for future visible light photocatalysis.

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Oxygen plasma treatment of bamboo fibers (BF) and its effects on the static and dynamic mechanical properties of BF-unsaturated polyester composites

Holzforschung ◽

10.1515/hf-2014-0097 ◽

2015 ◽

Vol 69 (4) ◽

pp. 449-455 ◽

Cited By ~ 15

Author(s):

Wendi Liu ◽

Tingting Chen ◽

Tianshun Xie ◽

Fuwen Lai ◽

Renhui Qiu

Keyword(s):

Plasma Treatment ◽

Photoelectron Spectroscopy ◽

Interfacial Adhesion ◽

Oxygen Plasma ◽

Unsaturated Polyester ◽

Flexural Modulus ◽

Oxygen Plasma Treatment ◽

X Ray ◽

Dynamic Mechanical ◽

Bamboo Fibers

Abstract A novel method for the preparation of bamboo fibers (BF) has been investigated that includes crushing, rolling, and other combing techniques with 1,4-butanediol as a dispersant. The fibers were treated by oxygen plasma to improve their interfacial adhesion to unsaturated polyester (UPE) resins. Composites were prepared from the plasma treated fibers (BFtr) and UPE by hand lay-up compression molding. BFtr significantly increased the tensile strength, flexural strength, and flexural modulus of the resulting BF-UPE composites. Dynamic mechanical analysis indicated that the plasma treatment essentially increased the storage modulus and glass transition temperature of the composites. The damping parameter of the composites showed a decreasing trend in the glassy region, while the opposite was true for the rubbery region. X-ray diffraction analysis indicated that the treatment did not change the crystal structures within the fibers but increased slightly their crystallinity indices. X-ray photoelectron spectroscopy analysis revealed that the surface of BFtr had a higher oxygen concentration and oxygen/carbon ratio than that of BF. The scanning electron microscopy graphs of the tensile-fractured surface of the composites demonstrated an improved interfacial adhesion between BFtr and UPE resins.

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