Selective removal of metallic single-walled carbon nanotubes in full length by organic film-assisted electrical breakdown

Otsuka, Ken-ichi; Inoue, Taiki; Chiashi, Shohei; Maruyama, Shigeo

doi:10.1039/c4nr01690d

Cited by 35 publications

(43 citation statements)

References 38 publications

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“…[59] The other alignment that can be achieved on a substrate is a parallel growth. Much progress has been achieved in the development of this process for demonstrations of selective growth or removal, [70] high-density growth, [71] and etc. [60][61][62][63] In this type of growth, tubes fly along the gas flow, and the catalyst are located at the tips of the SWNTs.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Single‐Walled Carbon Nanotubes in Emerging Solar Cells: Synthesis and Electrode Applications

Jeon

Xiang

Shawky

et al. 2018

Advanced Energy Materials

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years, because of growing concerns over the energy security. Among different types of photovoltaics, silicon solar cells give power conversion efficiencies (PCEs) of over 26% with excellent durability. This technology has already reached the market, and the products are readily available. However as recent technologies, such as flexible smartphones and IoT (internet of things), evolve into more versatile and portable electronics, there is a shift of demand from performance-centric technologies to versatility-oriented technologies. In other words, the paradigm is shifting to flexible, wearable, and light-weight electronic devices. Energy-generating devices are also following the same path. This means that the thin-film solar cell technologies, such as organic solar cells (OSCs) [1][2][3] and perovskite solar cells (PSCs), [4,5] are considered to be the wave of the future with their critical attributes of being ultrathin (<1 mm), light-weight, and solution-processable. [6] These emerging thin-film solar cells have the potential to equal or surpass the PCE of silicon solar cells while having major advantages in terms of production cost, enhanced design and a variety of new functionalities. Furthermore, tandem photovoltaics, [7] which are combined solar cells of PSCs, silicon solar cells, [8] or OSCs, [9,10] are another new and promising category for the future photovoltaic technology. Despite different names of solar cell types, the device structure is largely the same. They commonly share the typical configuration of one photoactive layer in the center, two charge selective layers above and below the active layer, and two electrodes at each end-at least one of which has to be transparent so that sunlight can pass through it. While there has been an intense efficiency race within the emerging thin-film solar cell community, less attention has been paid to other features, such as flexibility and stability. These traits can be enhanced by using new electrodes and charge-selective layers. Not only the functionalities but also photovoltaic performance is heavily dependent on the electrode and the charge-selective layers. Many scientists around the world, thus far, have focused on these layers by developing novel materials and modifying conventional materials to push the boundaries of current thin-film photovoltaic technology.Abundant and mechanically resilient carbon allotropes are composed of carbon atoms only, yet manifest different electronic properties depending on their configurations and arrangements. Of the carbon species, carbon nanotubes (CNTs) are promising materials to be incorporated into the thin-film solar cells owing to a wide range of properties ranging from conductors to semiconductors with different bandgaps based Emerging solar cells, namely, organic solar cells and perovskite solar cells, are the thin-film photovoltaics that have light to electricity conversion efficiencies close to that of silicon solar cells while possessing advantages in having additional functionalities, facile-processability, an...

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Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Single‐Walled Carbon Nanotubes in Emerging Solar Cells: Synthesis and Electrode Applications

Jeon

Xiang

Shawky

et al. 2018

Advanced Energy Materials

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“…Purely semiconducting HA‐SWNT FETs can give data with a high ON‐OFF ratio, which translates to a more accurate doping effect observation. Semiconducting HA‐SWNT FETs were achieved by electrically burning off m‐SWNTs with the drain voltage up to V DS = 40 V prior to the measurement . Figure S7 and Table S5 show that the FET transfer characteristics demonstrate unipolar transport properties.…”

Section: Resultsmentioning

confidence: 99%

“…m‐SWNTs were burnt off by ramping the drain voltage from 0 V to a negative value until the drain current became sufficiently small (typically up to V DS = −6 V μm −1 ), while a positive gate voltage ( V GS = 10 V) was applied to turn the s‐SWNTs off …”

Section: Methodsmentioning

confidence: 99%

“…Semiconducting HA-SWNT FETs were achieved by electrically burning off m-SWNTs with the drain voltage up to V DS = 40 V prior to the measurement. [105][106][107] Figure S7 and Table S5 show that the FET transfer characteristics demonstrate unipolar transport properties. Contrary to those from the mixed SWNTs, right shifts were dominant for the semiconducting HA-SWNT FETs after the fullerene application ( Figure S7).…”

Section: Evmentioning

confidence: 97%

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Investigation of charge interaction between fullerene derivatives and single‐walled carbon nanotubes

Delacou

Jeon

Otsuka

et al. 2019

InfoMat

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The charge interaction and corresponding doping effect between single‐walled carbon nanotubes (SWNTs) and various fullerene derivatives, namely, C60, phenyl‐C61‐butyric acid methyl ester (PC61BM), methano‐indenefullerene (MIF), 1′,1″,4′,4″‐tetrahydrodi[1,4]methanonaphthaleno[5,6]fullerene (ICBA), 1,4‐bis(dimethylphenylsilylmethyl)[60]fullerene (SIMEF‐1), and dimethyl(orthoanisyl) silylmethyl(dimethylphenylsilylmethyl)[60]fullerene (SIMEF‐2), are investigated. A variety of analytical techniques, including field‐effect transistors (FETs) made of horizontally aligned arrays of SWNTs, is used as a means of investigation. Data from different measurements have to be used to obtain a concrete evaluation for the fullerene‐applied SWNTs. The data collectively points toward the conclusion that fullerenes with high molecular orbital energy levels, namely, MIF, SIMEF‐1, SIMEF‐2, and PC61BM, induce p‐type doping, while fullerenes with low molecular orbital energy levels, namely, ICBA and C60, induce n‐type doping on the carbon nanotubes. Nevertheless, the SWNTs retained p‐type characteristics because n‐doping induced by the fullerenes are weak compared to the p‐doping of the water and oxygen on carbon nanotubes. This means that fullerene derivatives have the ability to fine‐tune the energy levels of carbon nanotubes, which can play a crucial role in carbon nanotube‐based electronics, such as solar cells, light‐emitting devices, and FETs.

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“…Due to the presence of metallic tubes, the electrical characteristics (e.g., the on/off ratio and integration uniformity) of the SWNT transistors become poor and uncontrollable. 6 The second strategy consists of direct synthesis using various processes, for example, electrical breakdown, 9 gas-phase etching reactions, 10 ultraviolet irradiation, 11 etc. In general, there are two approaches to separate m-and s-SWNTs.…”

Section: Introductionmentioning

confidence: 99%

A rational design for the separation of metallic and semiconducting single-walled carbon nanotubes using a magnetic field

et al. 2016

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The separation of metallic (m-) and semiconducting (s-) single-walled carbon nanotubes (SWNTs) without causing contamination and damage is a major challenge for SWNT-based devices. As a facile and nondestructive tool, the use of a magnetic field could be an ideal strategy to separate m-/s-SWNTs, based on the difference of magnetic susceptibilities. Here, we designed a novel magnetic field-assisted floating catalyst chemical vapor deposition system to separate m-/s-SWNTs. Briefly, m-SWNTs are attracted toward the magnetic pole, leaving s-SWNTs on the substrate. By using this strategy, s-SWNTs with a purity of 99% could be obtained, which is enough to construct high-performance transistors with a mobility of 230 cm(2) V(-1) s(-1) and an on/off ratio of 10(6). We also established a model to quantitatively calculate the percentage of m-SWNTs on the substrate and this model shows a good match with the experimental data. Furthermore, our rational design also provides a new avenue for the growth of SWNTs with specific chirality and manipulated arrangement due to the difference of magnetic susceptibilities between different diameters, chiralities, and types.

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Selective removal of metallic single-walled carbon nanotubes in full length by organic film-assisted electrical breakdown

Cited by 35 publications

References 38 publications

Single‐Walled Carbon Nanotubes in Emerging Solar Cells: Synthesis and Electrode Applications

Single‐Walled Carbon Nanotubes in Emerging Solar Cells: Synthesis and Electrode Applications

Investigation of charge interaction between fullerene derivatives and single‐walled carbon nanotubes

A rational design for the separation of metallic and semiconducting single-walled carbon nanotubes using a magnetic field

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