An ultraviolet photoelectron spectroscopy study on bandgap broadening of epitaxial graphene on SiC with surface doping

Hu, Yanfei; Liu, Jialin; Dou, Wentao; Mao, Kangshan; Guo, Lixin; Chong, Laiyuan; Hu, Jichao; Yuan, Hao; He, Yanjing; Guo, Hui; Zhang, Yuming

doi:10.1016/j.carbon.2019.10.043

Cited by 8 publications

(4 citation statements)

References 55 publications

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“…The dependence of the ITO work function on different substrates was investigated by employing ultraviolet photoelectron spectroscopy (UPS). [ 28 ] The cutoff edge of the secondary electron is determined by the tangent method, and the work function is calculated by the following energy‐level equation [ 29 ]

\begin{matrix} ϕ = h ν - (E_{cutoff} - E_{f}) \end{matrix}

where ϕ is the work function, hν is the excitation energy, and the photon energy used is 21.2 eV. The Fermi energy level is denoted by E f , and the Fermi energy level is set to zero for all tests, that is, E f = 0.…”

Section: Resultsmentioning

confidence: 99%

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Silk Fibroin‐Based Flexible Organic Light‐Emitting Diode with High Light Extraction Efficiency

Chen

Kong

et al. 2022

Advanced Optical Materials

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It is an essential issue for the efficiency of flexible organic light‐emitting diodes (OLEDs) to be improved in display and lighting applications. Herein, the use of silk fibroin (SF) as a flexible OLED substrate with enhanced light extraction efficiency (LEE) is reported. Regenerated SF is prepared via a casting method and then coated with conductive indium tin oxide (ITO) via magnetron sputtering. SF‐based flexible OLED outperforms its reference device in terms of turn‐on voltage, peak brightness, and LEE, where glass and polyethylene terephthalate are used as rigid and flexible substrates, respectively. The improved device performance can be ascribed to the low refractive index of SF and its lower surface roughness and more matched energy levels compared to those of other substrates, resulting in a high LEE. Notably, a molecular dipole layer can be formed between the interface of ITO and SF. The dipole moment pointing to the ITO surface effectively changes the ITO work function and reduces the potential barrier height for hole transfer. The work provides new ideas for constructing high‐performance OLEDs on biomass‐based substrates with excellent flexibilities and high LEEs.

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\begin{matrix} ϕ = h ν - (E_{cutoff} - E_{f}) \end{matrix}

Section: Resultsmentioning

confidence: 99%

“…The dependence of the ITO work function on different substrates was investigated by employing ultraviolet photoelectron spectroscopy (UPS). [28] The cutoff edge of the secondary electron is determined by the tangent method, and the work function is calculated by the following energy-level equation [29] φ ν…”

Section: Resultsmentioning

confidence: 99%

Silk Fibroin‐Based Flexible Organic Light‐Emitting Diode with High Light Extraction Efficiency

Chen

Kong

et al. 2022

Advanced Optical Materials

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“…graphite [48][49][50] and diamonds), two-dimensional nanosheets (e.g. graphene [51][52][53]), one-dimensional nanowires (e.g. carbon nanotube [54][55][56] and graphene nanoribbons [57][58][59][60]), and zero-dimensional dots (e.g.…”

Section: Introductionmentioning

confidence: 99%

Graphene quantum dots: preparations, properties, functionalizations and applications

Tian,

Tang,

Teng

et al. 2024

Mater. Futures

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Due to its zero-dimensional property, graphene quantum dots (GQDs) has quantum confinement effect on the internal charge, so they show many properties different from the parent two-dimensional graphene, such as strong fluorescence, non-zero band gap and easily soluble in solvents. As a member of the family of carbon materials, GQDs also has biocompatibility and low toxicity, which is one of the reasons why GQDs can be widely used in the biomedical field .The edge effect of GQDs is also particularly important. By modifying the edge of GQDs, the performance of GQDs can be regulated. A lot of preparation technology of GQDs, probably can be divided into three categories, and top-down, bottom-up and chemical method, chemical method is different from other literature classification, mainly considering the certain of the preparation of GQDs way, not directly to block materials or direct synthesis of small molecule materials for GQDs, but through intermediate in chemical means under the action of changes and form GQDs. The detailed introduction of the optical, electrical, thermal and magnetic properties of GQDs is the premise of the performance regulation of GQDs. In addition to inheriting the excellent properties of graphene, GQDs also expand the properties of the parent material. The functionalization of GQDs mainly includes the doping technology of introducing heteroatom and the composite technology of combining with other substances to improve the performance of other substances. The performance of these functionalized products is also discussed. The original and functionalized properties of GQDs are based on the application of GQDs. In recent years, GQDs has been used in many fields, including optics, electricity, optoelectronics, biomedicine, energy, agriculture and some emerging interdisciplinary fields. Through the introduction and discussion of the recent research achievements of GQDs, this review mainly highlights the huge potential value of GQDs and puts forward the direction of the development of GQDs in the future.

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“…It is widely used in electromagnetic protection. 18,19 Tiyek et al 20 prepared reduced graphene oxide-doped poly (acrylonitrile-co-vinyl acetate) nanofiber mats, which were spun on polypropylene spunbond fabrics by a multi-needle electrospinning device at different lap numbers, and then multi-layered surface samples of spunbond/nanofiber mats via the calendaring process after overlapping in different layer numbers were prepared. Consequently, the highest electromagnetic shielding effectiveness value of 35.49 dB was obtained from the sample containing two layers of nanofiber mats, each of which consisted 50 laps of nanofibers.…”

mentioning

confidence: 99%

Preparation and study of electromagnetic properties of graphene/graphite/bismuth oxide three-layer coated textile materials

Liu

Wang

et al. 2021

Textile Research Journal

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Three-layer coated composites with good electromagnetic properties were prepared on a plain polyester–cotton blended fabric with PU2540 polyurethane resin as a matrix; graphene, graphite and bismuth oxide were used as coating functional particles; and the influences of types of surface-layer functional particles, middle-layer functional particles and bottom-layer functional particles on electromagnetic properties of three-layer composites were explored. Results showed that when graphite, graphene and graphene were respectively used as bottom-layer, middle-layer and surface-layer functional particles, within the range of 1–1000 MHz, the polarization, dissipation and absorption-attenuation ability of the coated composite to electromagnetic waves was the strongest, and within the range of 10–3000 MHz, the wave-absorbing properties and shielding properties to electromagnetic waves of the coated composite were the strongest. When the frequency was 1600.7 MHz, the value of the reflection loss of the sample was the minimum, which reached –7.15 dB.

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An ultraviolet photoelectron spectroscopy study on bandgap broadening of epitaxial graphene on SiC with surface doping

Cited by 8 publications

References 55 publications

Silk Fibroin‐Based Flexible Organic Light‐Emitting Diode with High Light Extraction Efficiency

Silk Fibroin‐Based Flexible Organic Light‐Emitting Diode with High Light Extraction Efficiency

Graphene quantum dots: preparations, properties, functionalizations and applications

Preparation and study of electromagnetic properties of graphene/graphite/bismuth oxide three-layer coated textile materials

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