Anisotropic electrical conduction of vertically-aligned single-walled carbon nanotube films

Lin, Chih‐Peng; Lee, Chi-Young; Chin, Tsung‐Shune; Xiang, Rong; Ishikawa, Kiichiro; Shiomi, Junichiro; Maruyama, Shigeo

doi:10.1016/j.carbon.2010.12.014

Cited by 33 publications

(27 citation statements)

References 32 publications

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“…[44] The key importance to growing a vertically aligned SWNT (VA-SWNTs) array is ensuring that the catalysts are small, dense, and efficient ( Figure 1e). Thanks to these geometric advantages, many elegant studies have been conducted using this system, including demonstration of growth kinetics by ex situ or in situ monitoring [48,49] and anisotropic optical/electronic properties, [50,51] manipulation/ patterning of the CNT films, [52][53][54] modulation of the SWNT structure, [55][56][57] and fabrication of a high-efficiency filter. As a follow-up of this work, "super-growth" process, in which enhanced growth efficiency was achieved by incorporating a trace amount of water into ethylene CVD (Table 1: Process I), was reported.…”

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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“…Our study highlights that contact resistances depend on the contact quality, which will be determined by the electronic structure of the substrate or coating material and its wettability with carbon (dening the tunneling barrier). While it is widely known that low-resistance end contacts are found between CNTs and metallic catalysts 17,32,34,35,51,[66][67][68][69] (e.g., a bond as strong as 7.6 eV per bond could be formed between Co catalyst and SWCNT 70 ), our results show that transplantation of CNTs (e.g., on Ni at 400 C) can still enable low resistively end contacts much below the typical CVD temperature (750 C). These ndings highlight that VACNT arrays can be transferred to substrates and devices on which direct CVD growth of the CNTs is not possible (e.g.…”

Section: Resultsmentioning

confidence: 53%

Characterization of contact resistances in ceramic-coated vertically aligned carbon nanotube arrays

Yang

Wood

et al. 2019

RSC Adv.

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“…The linearity of these curves indicates the Ohmic contact between CNT electrodes and the silver paste. On the other hand, if taking the macroscopic volume of the whole circuit into consideration, the nominal resistivities of these circuits were calculated to be on the scale of 10 -3 Ωm, which is comparable to that of VACNT carpet measured on the longitudinal direction [7]. The high packing density of CNTs and the entanglement between CNTs contribute to the intertube conduction along the CNT circuits.…”

Section: Resultsmentioning

confidence: 99%

Light detection by carbon nanotube circuit with strong intertube conduction

Shen

Miao

et al. 2012

2012 IEEE Sensors

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This manuscript reports the application of carbon nanotube (CNT) circuits as visible light sensors. The CNT circuits are made of vertically aligned multiwalled CNT (MWCNT) forests, with electrodes covered by silver paste, thus the electron conduction between electrodes was dominated by the intertube conduction. The linear current-voltage curves of these CNT circuits reveals typical circuit resistivity on the order of 10 -3 Ωm if taking the whole macroscopic volume of the CNT circuit into account. The CNT circuit resistivity was found to decrease with CNT height. On the other hand, the photocurrent was found to be sensitive to the illumination locations, and the largest photocurrent appears when the light spot was located at one electrode. In addition, the photocurrent varies with the applied voltage between electrodes, and it starts to saturate at about ±1.5 V for most CNT circuits.

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Anisotropic electrical conduction of vertically-aligned single-walled carbon nanotube films

Cited by 33 publications

References 32 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

Characterization of contact resistances in ceramic-coated vertically aligned carbon nanotube arrays

Light detection by carbon nanotube circuit with strong intertube conduction

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