Electronic structure of oxidized Ni/Au contacts on p-GaN investigated by x-ray absorption spectroscopy

Jan, J. C.; Chiou, J. W.; Pong, W. F.; Tseng, P. K.; Tsai, M.‐H.; Chang, Yin-Yu; Chen, Y. Y.; Lee, J. F.; Wu, Jun; Lin, Hong‐Ji; Chen, C. T.; Chen, L. C.; Chen, F. R.; Ho, Jau Der

doi:10.1063/1.1370121

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…The absorption edge of N-NiO shifts to a lower binding energy position compared with pristine NiO (Figure S4, Supporting Information), owing to the covalent effect attributed to the N doping. 29 Further, the small reduction in the amplitude for N-NiO was observed by Ni K-edge EXAFS spectroscopy k 3 χ(k) analysis, reflecting the change in the local atomic arrangement (Figure 1e). Figure 1f illustrates the Fourier-transformed EXAFS spectra, where the two main peaks are consistent with the Ni−O and Ni−Ni coordinations.…”

Section: Resultsmentioning

confidence: 86%

“…Hence, the Ni K-edge XAFS spectra were measured by X-ray absorption fine-structure (XAFS) spectroscopy method. The absorption edge of N-NiO shifts to a lower binding energy position compared with pristine NiO (Figure S4, Supporting Information), owing to the covalent effect attributed to the N doping . Further, the small reduction in the amplitude for N-NiO was observed by Ni K-edge EXAFS spectroscopy k 3 χ( k ) analysis, reflecting the change in the local atomic arrangement (Figure e).…”

Section: Resultsmentioning

confidence: 95%

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Bifunctional Electrocatalytic Activity of Nitrogen-Doped NiO Nanosheets for Rechargeable Zinc–Air Batteries

Qian

Bai

et al. 2019

ACS Appl. Mater. Interfaces

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In order to improve the efficiencies and service lifetimes of rechargeable Zn–air batteries, it is necessary to develop highly efficient air electrocatalysts. In the present study, we prove that the bifunctional electrocatalytic activity in NiO nanosheets is effectively improved by the synergistic effects of N dopants and considerably porous structure. As an electrocatalyst for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), the as-prepared porous N-doped NiO nanosheets exhibit good activities with the small overpotential and ideal half-wave potential, which is superior to Ir/C electrocatalyst. Besides, it is proved that the process of HO* being oxidized to O* is the OER potential rate-determining step; also the OER electrocatalytic performance of NiO can be markedly promote by the doping of N atoms using the density functional theory calculations. Furthermore, the fabricated Zn–air battery based on the porous N-doped NiO nanosheets also exhibits superior activities, outperforming many reported NiO-based electrocatalyst materials. Two series Zn–air cells with a voltage of 2.80 V can power a red light-emitting diode, which shows their large potential for various applications.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 95%

Bifunctional Electrocatalytic Activity of Nitrogen-Doped NiO Nanosheets for Rechargeable Zinc–Air Batteries

Qian

Bai

et al. 2019

ACS Appl. Mater. Interfaces

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“…It is known that it depends strongly on the substrate properties and hence its condition. Inorganic semiconductor materials are rarely studied in terms of their use as electrodes, ie, substrates for organic layer growth, which were mainly performed on metallic substrates . This is a consequence of experimental difficulties, and the need to use ultrahigh vacuum (UHV) conditions due to the high reactivity of the semiconductor surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of ionic interfacial layers on electronic properties of Alq₃/Si(100) interface

Mazur

Sito

Grodzicki

et al. 2018

Surface & Interface Analysis

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100) systems are presented in this report. Their energy level diagrams were prepared and discussed. The formation of the LiBr and KCl interfacial layers between an Alq 3 film and a Si(100) substrate results in a decrease of the energy barrier at the interface. The studies were carried out in situ in ultrahigh vacuum by ultraviolet photoelectron spectroscopy. Alq 3 as well as LiBr and KCl layers were vapour evaporated onto n-type Si(100) crystal. The electron affinity of clean Si(100) surface was 4.0 eV, and the position of the valence band maximum was 0.7 eV below E F . The energetic distance between the valence band maximum of Si(100) and the highest occupied molecular orbital level were 1.5, 2.6, and 2.2 eV, for the Alq 3 /Si(100), Alq 3 /LiBr/Si(100), and Alq 3 /KCl/ Si(100) systems, respectively.

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“…However, the reason for the low resistive ohmic contact obtained by metallization of the Ti layer in GaN is under debate due to the complication of the Ti/GaN interfacial properties. X‐ray absorption near edge structure (XANES) has been effectively used for the study of the electronic structure of p‐GaN layers 10 and Ni/Au/p‐GaN contacts 11.…”

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confidence: 99%

X‐ray absorption spectroscopic study on Ti/n‐GaN

Kumar

Chiou

et al. 2005

Physica Status Solidi (a)

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Formation of low resistance and thermally stable ohmic contacts to GaN is of considerable importance for device applications. Several metallization schemes for ohmic contacts to n‐GaN with low contact resistance have been proposed and investigated by different techniques. We investigate 500 Å Ti/n‐GaN contacts of as‐deposited and rapid furnace annealed at 900 °C for 30 s, using X‐ray diffraction pattern, I–V measurements, and X‐ray absorption near edge spectra at Ti K‐ and L3,2‐edges and elucidate the mechanism responsible for the high ohmic behaviour. These measurements indicate the formation of an interfacial TixN layer and intermetallic alloys of Ti and Ga at the Ti/n‐GaN interface upon high temperature annealing. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Electronic structure of oxidized Ni/Au contacts on p-GaN investigated by x-ray absorption spectroscopy

Cited by 10 publications

References 15 publications

Bifunctional Electrocatalytic Activity of Nitrogen-Doped NiO Nanosheets for Rechargeable Zinc–Air Batteries

Bifunctional Electrocatalytic Activity of Nitrogen-Doped NiO Nanosheets for Rechargeable Zinc–Air Batteries

Influence of ionic interfacial layers on electronic properties of Alq₃/Si(100) interface

X‐ray absorption spectroscopic study on Ti/n‐GaN

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Electronic structure of oxidized Ni/Au contacts on p-GaN investigated by x-ray absorption spectroscopy

Cited by 10 publications

References 15 publications

Bifunctional Electrocatalytic Activity of Nitrogen-Doped NiO Nanosheets for Rechargeable Zinc–Air Batteries

Bifunctional Electrocatalytic Activity of Nitrogen-Doped NiO Nanosheets for Rechargeable Zinc–Air Batteries

Influence of ionic interfacial layers on electronic properties of Alq3/Si(100) interface

X‐ray absorption spectroscopic study on Ti/n‐GaN

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Influence of ionic interfacial layers on electronic properties of Alq₃/Si(100) interface