Chemical Visualization of a GaN p-n junction by XPS

Çalışkan, Deniz; Sezen, Hikmet; Özbay, Ekmel; Süzer, Şefik

doi:10.1038/srep14091

Cited by 10 publications

(7 citation statements)

References 57 publications

(73 reference statements)

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“…By exposing the dielectric surface to a constant flow of either electrons or X-rays, both positive and negative charging of a dielectric grown on a semiconductor were achieved. The experimentally determined photoemission intensities, including broadening and peak shifts, were modeled by making some basic assumptions regarding semiconductor band bending, potential profile across the oxide, and possible defects states in the film. − Cohen and co-workers have extended the application of flood gun charging strategies to a wider class of interfaces using the phrase “chemically resolved electrical measurements” to describe their method. − Suzer et al have performed extensive XPS-based measurements on defects and charging effects in oxides − and have also recently explored in-plane surface potential variations using XPS imaging on in-plane biased structures. − Lastly, Kobayashi et al, have applied a bias across a metal/oxide/semiconductor (MOS) stack using 3 nm Pt films as top electrodes and performed XPS in order to model the oxide defects density based on the evolution of the substrate band bending. − In all these studies, however, the determination of the potential profile across an entire stack was never performed.…”

mentioning

confidence: 99%

Nanoscale Internal Fields in a Biased Graphene–Insulator–Semiconductor Structure

Rangan¹,

Kalyanikar

Duan³

et al. 2016

J. Phys. Chem. Lett.

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Measuring and understanding electric fields in multilayered materials at the nanoscale remains a challenging problem impeding the development of novel devices. At this scale, it is far from obvious that materials can be accurately described by their intrinsic bulk properties, and considerations of the interfaces between layered materials become unavoidable for a complete description of the system's electronic properties. Here, a general approach to the direct measurement of nanoscale internal fields is proposed. Small spot X-ray photoemission was performed on a biased graphene/SiO2/Si structure in order to experimentally determine the potential profile across the system, including discontinuities at the interfaces. Core levels provide a measure of the local potential and are used to reconstruct the potential profile as a function of the depth through the stack. It is found that each interface plays a critical role in establishing the potential across the dielectric, and the origin of the potential discontinuities at each interface is discussed.

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confidence: 99%

Nanoscale Internal Fields in a Biased Graphene–Insulator–Semiconductor Structure

Rangan¹,

Kalyanikar

Duan³

et al. 2016

J. Phys. Chem. Lett.

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“…The emission efficiency and homogeneity of our LEDs could be improved by increasing the conductivity of the GaN and ZnO films, smoothing the interface between p-GaN and n-ZnO, and optimizing the device geometries, etc. More detailed XPS characterizations, especially operando XPS, could give valuable insight on the lighting mechanism. All of these warrant future investigations.…”

Section: Resultsmentioning

confidence: 99%

Solution-Grown ZnO Films toward Transparent and Smart Dual-Color Light-Emitting Diode

Xiao

Zhang

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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An individual light-emitting diode (LED) capable of emitting different colors of light under different bias conditions not only allows for compact device integration but also extends the functionality of the LED beyond traditional illumination and display. Herein, we report a color-switchable LED based on solution-grown n-type ZnO on p-GaN/n-GaN heterojunction. The LED emits red light with a peak centered at ∼692 nm and a full width at half-maximum of ∼90 nm under forward bias, while it emits green light under reverse bias. These two lighting colors can be switched repeatedly by reversing the bias polarity. The bias-polarity-switched dual-color LED enables independent control over the lighting color and brightness of each emission with two-terminal operation. The results offer a promising strategy toward transparent, miniaturized, and smart LEDs, which hold great potential in optoelectronics and optical communication.

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“…The AMQ is then adsorbed by coulombic attraction at the steel surface, where iodide ions are already adsorbed by chemisorption. Stabilization of adsorbed iodide ions by means of electrostatic interaction with AMQ leads to greater surface coverage and thereby, greater inhibition 11 . The strong synergistic inhibition of AMQ with halide and cation mixture makes Inhibition efficiency, % the corrosion potential (E corr ) shift to anodic direction.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

The Synergistic Effects of Halide Ions and Cations on the Corrosion Inhibition of Mild Steel in H2SO4 Using Amodiaquine

2013

Chem Sci Trans

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The synergistic effect of amodiaquine (AMQ) and some selected metal cations (Na + , Mg 2+ ) and halides (Cl -, Br -, I -) on the corrosion of mild steel in 0.5 M H 2 SO 4 was studied by weight loss methods, electrochemical impedance spectroscopy and potentiodynamic polarization measurements. Efforts were taken to enhance the inhibition efficiency at different concentration of amodiaquine with fixed concentration of cations and halides. As the concentration of amodiaquine increased the inhibition efficiency (IE) increases. Addition of fixed concentration of halides on different concentration of amodiaquine inferred the increase in inhibition efficiency with concentration of amodiaquine. Maximum inhibition efficiency was observed with 10 -2 M amodiaquine and 10 -2 M Iion. The synergistic action was also noted when 10 -2 M Na + , Mg 2+ with 10 -4 M amodiaquine. Synergistic parameter for amodiaquine with cations and halides confirmed the synergistic effect of halides and cations and corrosion of mild steel in the presence of 0.5 M H 2 SO 4 . Potentiodynamic polarization and electrochemical impedance spectroscopy for mild steel in the synergistic addition of halide and cations confirmed the mixed mode of inhibition.

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Chemical Visualization of a GaN p-n junction by XPS

Cited by 10 publications

References 57 publications

Nanoscale Internal Fields in a Biased Graphene–Insulator–Semiconductor Structure

Nanoscale Internal Fields in a Biased Graphene–Insulator–Semiconductor Structure

Solution-Grown ZnO Films toward Transparent and Smart Dual-Color Light-Emitting Diode

The Synergistic Effects of Halide Ions and Cations on the Corrosion Inhibition of Mild Steel in H2SO4 Using Amodiaquine

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