Carbon nanotube quantum dots fabricated on a GaAs∕AlGaAs two-dimensional electron gas substrate

Tsukamoto, Takeo; Moriyama, Satoshi; Tsuya, Daiju; Suzuki, Masaki; Yamaguchi, Tomohiro; Aoyagi, Yoshinobu; Ishibashi, Koji

doi:10.1063/1.2077841

Cited by 16 publications

(16 citation statements)

References 12 publications

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“…The color coordinate of the as-fabricated WLEDs at (0.33, 0.28) was very close to that of the pure white light. The curing flexible 100 wt % SRs with the shore hardness at 13 A were expected to have potential application in flexible optoelectronic devices because a few groups have reported that kind of work based on CDs, − graphene, and carbon nanotubes. − …”

Section: Introductionmentioning

confidence: 99%

Polysiloxane Functionalized Carbon Dots and Their Cross-Linked Flexible Silicone Rubbers for Color Conversion and Encapsulation of White LEDs

Wang

Yin

Xie

et al. 2016

ACS Appl. Mater. Interfaces

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In this work, aminopropylmethylpolysiloxane (AMS) functionalized luminescent carbon dots (AMS-CDs) were prepared via a one-step solvothermal method. AMS-CDs could be self- or co-cross-linking with AMS to form 3D flexible transparent silicone rubbers (SRs) where CDs acted as cross-linking points, so the loading fraction of AMS-CDs could be adjusted from 10 to 100 wt %, thus modulating fluorescence properties and flexibility of silicone rubbers. Because of the self-curing property and high thermal stability, AMS-CDs were also studied in white LEDs (WLEDs), serving as a color conversion and encapsulation layer of GaN based blue LEDs simultaneously that would avoid the traditional problem of poor compatibility between emitting and packaging materials. And the color coordinate of AMS-CDs based WLEDs (0.33, 0.28) was very close to the pure white light. In addition, the obtained CDs cross-linked SRs had good transparency (T > 80%) at 510-1400 nm and high refractive indexes (1.33-1.54) that could meet the need of commercial packaging materials and optical application. AMS-CDs were also promising to be used in the UV LEDs based WLEDs according to their wide wavelength emission and flexible optoelectronic device.

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Section: Introductionmentioning

confidence: 99%

Polysiloxane Functionalized Carbon Dots and Their Cross-Linked Flexible Silicone Rubbers for Color Conversion and Encapsulation of White LEDs

Wang

Yin

Xie

et al. 2016

ACS Appl. Mater. Interfaces

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“…SWCNT quantum-dot devices may open other device designs and may have interfaces to outside electronic circuits by combining them with the GaAs/ AlGaAs two-dimensional electron gas system 41 and Si metal-oxide semiconductor field-effect transistors ͑MOSFETs͒. In our present study, we showed that the carbon nanotubes are a promising building block for extremely small quantum-dot-based nanodevices that are not easily fabricated by standard microfabrication techniques.…”

Section: Discussionmentioning

confidence: 60%

Quantum-dot nanodevices with carbon nanotubes

Ishibashi

Moriyama

Tsuya

et al. 2006

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Articles you may be interested inPerfect spin-filter and quantum-signal generator in a parallel coupled multiple triple-quantum-dots deviceWe review our recent work on quantum-dot devices with carbon nanotubes. We conclude that the single-wall carbon nanotube quantum dot is an artificial atom with two-or four-electron shell structures. Zeeman splitting of single particle levels was observed, which is advantageous for the spin based quantum computing device ͑spin qubit͒ because the single spin is generated by putting one electron in the shell. Single-electron devices such as single-electron inverter and single-electron exclusive-OR gates have been fabricated, and their performance has been demonstrated at liquid-helium temperature. Despite the expected room-temperature operation from the single-electron charging energy, the operation temperature of our devices was limited to ϳ10 K because of the low height of the tunnel barrier.

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“…Next, we show another mechanism to detect the THz photons [69]. A SWCNT SET was fabricated on top of the GaAs/AlGaAs 2DEG wafer [70].…”

Section: Quantum Thz Detectionmentioning

confidence: 99%

Quantum-Dot Devices with Carbon Nanotubes

Ishibashi

2015

Frontiers of Graphene and Carbon Nanotubes

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Carbon nanotubes (CNTs) are attractive building blocks for quantum dots because of their extremely small diameters. In this chapter, typical behaviors of the carbon nanotube quantum dots and their artificial atom features are discussed. Then, some applications to the quantum-dot devices are presented. Some challenges on the necessary technologies toward integrated quantum-dot devices are also described. IntroductionA quantum dot is a structure where electrons are confined in three dimensions and has been studied for functional device applications as well as for exploring interesting physics in nanoscale. The spacing between confined discrete energy levels (E) is a important energy scale associated with the quantum dot, which becomes large as the size of the quantum dot becomes small. In the surface-gated quantum dots formed at an interface between the GaAs/AlGaAs heterostructures, which have been widely used to study transport physics [1], a size of the dot is in a range of submicron. This is limited by the resolution of electron beam lithography, and the corresponding level spacing is of the order of 0.1 meV. Another important energy scale associated with the quantum dot is a charging energy of single electrons (E c D e 2 /C † : e is an elementary charge and C † is a self-capacitance of the dot). It is of the order of 1 meV for the lithographically defined quantum dots. With those energy scales, quantum confinement effects and single-electron effects are usually observable below 1 K. Therefore, it is natural to use carbon nanotubes as building blocks of the extremely small quantum dot to realize larger quantum effects and higher temperature operation of quantum-dot devices.

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Carbon nanotube quantum dots fabricated on a GaAs∕AlGaAs two-dimensional electron gas substrate

Cited by 16 publications

References 12 publications

Polysiloxane Functionalized Carbon Dots and Their Cross-Linked Flexible Silicone Rubbers for Color Conversion and Encapsulation of White LEDs

Polysiloxane Functionalized Carbon Dots and Their Cross-Linked Flexible Silicone Rubbers for Color Conversion and Encapsulation of White LEDs

Quantum-dot nanodevices with carbon nanotubes

Quantum-Dot Devices with Carbon Nanotubes

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