Comprehensive analysis of two-dimensional charge transport mechanism in thin-film transistors based on random networks of single-wall carbon nanotubes using transient measurements

Shin, Hyeonwoo; Park, Sang-Joon; Kang, Byeong‐Cheol; Ha, Tae‐Jun

doi:10.1007/s12274-021-3697-0

Cited by 12 publications

(6 citation statements)

References 56 publications

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“…The conductivity map (Figure a) of a semiconducting CNT network was obtained via the same method as described in Figure . Overall, the semiconducting CNT network exhibited 1–2 orders of magnitude smaller conductivity than metallic CNTs (Figure ), which is consistent with previously reported results. − Also, it should be noted that the regions of semiconducting individual CNTs had smaller conductivities than semiconducting CNT bundles. For example, the conductivity of an individual (marked by (1), thickness ∼1.4 nm) or a bundled CNT (marked by (2), thickness ∼14 nm) was found to be ∼ 46.3 or ∼ 332.9 S cm –1 , respectively.…”

Section: Resultssupporting

confidence: 91%

“…By distinguishing the semiconducting CNT bundles and individual CNTs (Figure S5b) based on topography map (Figure S4a), we found that the region with a high σ with a large variation of N T (marked by the red dotted line) corresponded to the region of CNT bundles (Figure S5c). Presumably, bandgap overlapping between individual semiconducting CNTs in the bundles led to an increase in the conductivity . Also, the Schottky barrier at the contact area between individual CNTs in the bundles should have induced a large variation of charge trap densities. ,,, However, in the regions of individual CNTs , we observed the scaling behavior of σ ∝ N T –1 (Figure S5d), which could be attributed to the ballistic transport as reported previously. , It implies that some regions of individual semiconducting CNTs exhibited the ballistic transport behavior when the CNT network reached an on-state by a high negative gate bias.…”

Section: Resultssupporting

confidence: 78%

“…Presumably, bandgap overlapping between individual semiconducting CNTs in the bundles led to an increase in the conductivity. 44 Also, the Schottky barrier at the contact area between individual CNTs in the bundles should have induced a large variation of charge trap densities. 13,50,51,63 However, in the regions of individual CNTs, we observed the scaling behavior of σ ∝ N T −1 (Figure S5d), which could be attributed to the ballistic transport as reported previously.…”

Section: Resultsmentioning

confidence: 99%

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Nanoscale Mapping of Carrier Mobilities in the Ballistic Transports of Carbon Nanotube Networks

Kim

Shin

et al. 2022

ACS Nano

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Much progress has been made in the nanoscale analysis of nanostructures, while the mapping of key charge transport properties such as a carrier mobility remains a challenge, especially for one-dimensional systems. Here, we report the nanoscale mapping of carrier mobilities in carbon nanotube (CNT) networks and show that charge transport behaviors varied depending on network structures. In this work, the spatial distribution of localized charge transport properties such as mobilities and charge trap densities in CNT networks were mapped via a scanning noise microscopy. The mobility map was obtained from the conductivity maps measured at different back-gate biases, showing up to two orders of mobility variations depending on localized network structures. Furthermore, from the maps, correlations between mobility/ conductivity and charge trap density were analyzed to determine charge transport mechanisms. In metallic CNT networks, the regions with rather high (low) or low (high) charge trap densities (mobilities) exhibited a dif fusive or ballistic transport behavior, respectively. Interestingly, semiconducting CNT networks also exhibited a gradual transition from a diffusive to a ballistic transport behavior as the CNT mobility was increased by reaching the on-state with negative gate biases. The mapping of the cross-patterned CNT network showed that metallic CNT electrodes could achieve a good electrical contact with semiconducting CNTs without high contact resistance regions. Since this method allowed one to map versatile charge transport properties such as mobility, conductivity, and charge trap density, it can be a powerful tool for basic research about charge transport phenomena and practical device applications.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

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Nanoscale Mapping of Carrier Mobilities in the Ballistic Transports of Carbon Nanotube Networks

Kim

Shin

et al. 2022

ACS Nano

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“…51 DA is oxidized to dopamine-O-quinone while electrostatically interacting with the Co-C-matrix/GCE via covalent or π-π bonds. 51,52 The overall reversible oxidation mechanism of DA is expressed as follows: 31…”

Section: Resultsmentioning

confidence: 99%

High-Performance Non-Enzymatic Electrochemical Dopamine Sensors Based on Metal-Organic Framework Derived Co-C-Matrix Nanoplatforms

Hedau

Kang

Park

et al. 2022

J. Electrochem. Soc.

Self Cite

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A facile electrochemical sensing nanoplatform for detection of ultralow dopamine (DA) concentrations is developed through modification of cobalt-benzene tricarboxylic acid (Co-BTC) derived cobalt-carbon-matrix (Co-C-matrix). To enhance surface reactions and enzyme-like activities involved in interaction with DA, the structural integration of hybrid Co-C-matrix into Co-BTC as metal-organic framework is investigated, resulting in nanostructured transducing media with high sensitivity and selectivity as the catalyst. The Co-C-matrix nanoplatform exhibited the improved performance based on electrocatalytic oxidation of DA with high sensitivity of 7176 µA mM-1 cm-2 and low detection limit of 10 nM. Furthermore, the linearity of an amperometry peak toward DA concentration over a wide concentration range of 10-25 µM was observed under optimal conditions. Excellent selectivity in the presence of potential interferents and operational stability in ambient air for 30 days as well as under environmental conditions for the electrochemical oxidation of dopamine were achieved. The practical feasibility of these non-enzymatic biosensors is demonstrated on real samples, where DA is detected in human serum with outstanding recovery of up to 100%. The synergetic effect of Co atoms dispersed in the matrix of the carbon nanohybrid results in abundant active sites for DA oxidation and electron transfer pathways.

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“…Single-walled carbon nanotubes (SWCNTs) have an energy bandgap of ~2 eV, which is typically used as a semiconductor film [39,40]. Many efforts have been made to develop CNT-based TFTs owing to their transparency and easy-to-fabricate process with solution processability [40,41]. In this regard, progress in implementing CNTs-based circuits has been reported.…”

Section: Cnt-based Thin-film Digital Circuitsmentioning

confidence: 99%

Recent Progress in Thin-Film Transistors toward Digital, Analog, and Functional Circuits

Kim

Yoo

2022

Micromachines

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Thin-film transistors have been extensively developed due to their process merit: high compatibility with various substrates, large-area processes, and low-cost processes. Despite these advantages, most efforts for thin-film transistors still remain at the level of unit devices, so the circuit level for practical use needs to be further developed. In this regard, this review revisits digital and analog thin-film circuits using carbon nanotubes (CNTs), organic electrochemical transistors (OECTs), organic semiconductors, metal oxides, and two-dimensional materials. This review also discusses how to integrate thin-film circuits at the unit device level and some key issues such as metal routing and interconnection. Challenges and opportunities are also discussed to pave the way for developing thin-film circuits and their practical applications.

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Comprehensive analysis of two-dimensional charge transport mechanism in thin-film transistors based on random networks of single-wall carbon nanotubes using transient measurements

Cited by 12 publications

References 56 publications

Nanoscale Mapping of Carrier Mobilities in the Ballistic Transports of Carbon Nanotube Networks

Nanoscale Mapping of Carrier Mobilities in the Ballistic Transports of Carbon Nanotube Networks

High-Performance Non-Enzymatic Electrochemical Dopamine Sensors Based on Metal-Organic Framework Derived Co-C-Matrix Nanoplatforms

Recent Progress in Thin-Film Transistors toward Digital, Analog, and Functional Circuits

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