Photocurrent Spectroscopy of (<i>n</i>, <i>m</i>) Sorted Solution-Processed Single-Walled Carbon Nanotubes

Engel, Michael; Moore, Katherine E.; Alam, Asiful; Dehm, Simone; Krupke, Ralph; Flavel, Benjamin S.

doi:10.1021/nn503278d

Cited by 20 publications

(15 citation statements)

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“…1 This has been accompanied by an explosion of applications-based research into SWCNTs in all fields of science from photonics, 2−4 telecommunications, 5 solar cells, 6,7 batteries, 8 fuel cells, 9 high-frequency transistors, 10 biosensors, 11 and novel memory devices, 12 through to sports equipment and cancer research. 7,13−15 Amongst other characteristics, it is their structure-dependent optical properties that make SWCNTs such an interesting material.…”

Section: Introductionmentioning

confidence: 99%

Fitting Single-Walled Carbon Nanotube Optical Spectra

et al. 2017

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In this work, a comprehensive methodology for the fitting of single-walled carbon nanotube absorption spectra is presented. Different approaches to background subtraction, choice of line profile, and calculation of full width at half-maximum are discussed both in the context of previous literature and the contemporary understanding of carbon nanotube photophysics. The fitting is improved by the inclusion of exciton–phonon sidebands, and new techniques to improve the individualization of overlapped nanotube spectra by exploiting correlations between the first- and second-order optical transitions and the exciton–phonon sidebands are presented. Consideration of metallic nanotubes allows an analysis of the metallic/semiconducting content, and a process of constraining the fit of highly congested spectra of carbon nanotube solid films according to the spectral weights of each (n, m) species in solution is also presented, allowing for more reliable resolution of overlapping peaks into single (n, m) species contributions.

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Section: Introductionmentioning

confidence: 99%

Fitting Single-Walled Carbon Nanotube Optical Spectra

et al. 2017

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“…Photoinduced free-carrier generation in semiconducting single-walled carbon nanotubes (SWCNTs) has been controversial because of the substantial binding energy (hundreds of meV) of photogenerated excitons, coulombically bound electron–hole pairs 1 2 . Although a low probability of exciton dissociation is expected in SWCNTs, photoinduced carrier generation has been observed in neat SWCNT samples in a number of studies 3 4 5 6 7 8 9 10 11 12 . Most of these examples of carrier generation have been observed in solid-state samples featuring either tube–tube contacts or tube–electrode contacts.…”

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confidence: 99%

Photoinduced spontaneous free-carrier generation in semiconducting single-walled carbon nanotubes

et al. 2015

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Strong quantum confinement and low dielectric screening impart single-walled carbon nanotubes with exciton-binding energies substantially exceeding kBT at room temperature. Despite these large binding energies, reported photoluminescence quantum yields are typically low and some studies suggest that photoexcitation of carbon nanotube excitonic transitions can produce free charge carriers. Here we report the direct measurement of long-lived free-carrier generation in chirality-pure, single-walled carbon nanotubes in a low dielectric solvent. Time-resolved microwave conductivity enables contactless and quantitative measurement of the real and imaginary photoconductance of individually suspended nanotubes. The conditions of the microwave conductivity measurement allow us to avoid the complications of most previous measurements of nanotube free-carrier generation, including tube–tube/tube–electrode contact, dielectric screening by nearby excitons and many-body interactions. Even at low photon fluence (approximately 0.05 excitons per μm length of tubes), we directly observe free carriers on excitation of the first and second carbon nanotube exciton transitions.

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“…Photocurrent mapping and photocurrent spectroscopy are two examples of optoelectronic characterization techniques that proved spatial resolution below 1 μm (cf. Figure c).…”

Section: Optoelectronic Propertiesmentioning

confidence: 99%

“…Figure a–c shows a principle sketch of a further method proposed by Krupke and coworkers using a combined photocurrent mapping and photocurrent spectroscopy. Herein, both the current noise level and the spatial resolution are slightly worse, but the combination of microscopy and spectroscopy allows to determining the distribution of particular CNT chiralities inside the transistor channel of a working optoelectronic device fabricated from solution‐processed SWCNTs . Holleitner and coworkers proposed ultrafast time‐resolved photocurrent spectroscopy to probe exciton dissociation and ballistic transport in 1D materials in a transistor channel …”

Section: Optoelectronic Propertiesmentioning

confidence: 99%

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Advanced Characterization Methods for Electrical and Sensoric Components and Devices at the Micro and Nano Scales

Sheremet

Meszmer

Blaudeck

et al. 2019

Physica Status Solidi (a)

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The present study covers the nanoanalysis methods for four key material characteristics: electrical and electronic properties, optical, stress and strain, and chemical composition. With the downsizing of the geometrical dimensions of the electronic, optoelectronic, and electromechanical devices from the micro to the nanoscale and the simultaneous increase in the functionality density, the previous generation of microanalysis methods is no longer sufficient. Therefore, the metrology of materials' properties with nanoscale resolution is a prerequisite in materials' research and development. The article reviews the standard analysis methods and focuses on the advanced methods with a nanoscale spatial resolution based on atomic force microscopy (AFM): current-sensing AFM (CS-AFM), Kelvin probe force microscopy (KPFM), and hybrid optical techniques coupled with AFM including tip-enhanced Raman spectroscopy (TERS), photothermal-induced resonance (PTIR) characterization methods (nano-Vis, nano-IR), and photo-induced force microscopy (PIFM). The simultaneous acquisition of multiple parameters (topography, charge and conductivity, stress and strain, and chemical composition) at the nanoscale is a key for exploring new research on structure-property relationships of nanostructured materials, such as carbon nanotubes (CNTs) and nano/microelectromechanical systems (N/MEMS). Advanced nanocharacterization techniques foster the design and development of new functional materials for flexible hybrid and smart applications.

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Photocurrent Spectroscopy of (n, m) Sorted Solution-Processed Single-Walled Carbon Nanotubes

Cited by 20 publications

References 46 publications

Fitting Single-Walled Carbon Nanotube Optical Spectra

Fitting Single-Walled Carbon Nanotube Optical Spectra

Photoinduced spontaneous free-carrier generation in semiconducting single-walled carbon nanotubes

Advanced Characterization Methods for Electrical and Sensoric Components and Devices at the Micro and Nano Scales

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