Functional Single-Walled Carbon Nanotube-based Molecular Devices

Liu, Song; Guo, X. M.

doi:10.6023/a13010024

Cited by 4 publications

(2 citation statements)

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“…(2) Unexpected mobility: The atom at the metal electrode surface may rearrange or move due to the electric field and local heating, especially under ambient conditions, which strongly influence the stability of single-molecule devices . (3) Contact nature: Molecular electronics is often limited by the poorly defined nature of the contact between the molecules and the metal surface . Even for the most well-studied system, such as thiolated molecules on Au contacts, there are no methods to control the types of metal–molecule bonds .…”

Section: Discussionmentioning

confidence: 99%

“…Carbon-based electrodes can overcome these problems, for example, incompatibility and unexpected mobility. Using SWNTs as point contacts, well-defined covalent bonds between the electrode and the molecule with a limited number of molecular bonding sites can be created . However, single-molecule studies based on SWNTs also face considerable challenges before they can realize their full commercial application .…”

Section: Discussionmentioning

confidence: 99%

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Molecular-Scale Electronics: From Concept to Function

et al. 2016

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Creating functional electrical circuits using individual or ensemble molecules, often termed as "molecular-scale electronics", not only meets the increasing technical demands of the miniaturization of traditional Si-based electronic devices, but also provides an ideal window of exploring the intrinsic properties of materials at the molecular level. This Review covers the major advances with the most general applicability and emphasizes new insights into the development of efficient platform methodologies for building reliable molecular electronic devices with desired functionalities through the combination of programmed bottom-up self-assembly and sophisticated top-down device fabrication. First, we summarize a number of different approaches of forming molecular-scale junctions and discuss various experimental techniques for examining these nanoscale circuits in details. We then give a full introduction of characterization techniques and theoretical simulations for molecular electronics. Third, we highlight the major contributions and new concepts of integrating molecular functionalities into electrical circuits. Finally, we provide a critical discussion of limitations and main challenges that still exist for the development of molecular electronics. These analyses should be valuable for deeply understanding charge transport through molecular junctions, the device fabrication process, and the roadmap for future practical molecular electronics.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Molecular-Scale Electronics: From Concept to Function

et al. 2016

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Summary and Perspectives

2020

Molecular‐Scale Electronics

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Synergistic Photomodulation of Capacitive Coupling and Charge Separation Toward Functional Organic Field‐Effect Transistors with High Responsivity

Zhang

Hui

Chen

et al. 2015

Adv Elect Materials

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effectively built by interface engineering because the nature of the interfaces that are ubiquitous in OFETs plays an important role in the performance and stability of devices. [ 8 ] Among different interfaces, the dielectric/semiconductor interface is particularly vital as, under an applied electric fi eld, charge carriers are directly generated and transported at this interface. Hence, the polarity, charge distribution, and surface roughness of the dielectric/semiconductor interface can dramatically affect the device performance. Besides these factors, intrinsic characteristics of dielectric materials, such as permittivity, can also infl uence the carrier transport in the semiconductor. Therefore, it is essential to modify the dielectric/semiconductor interface and functionalize dielectric layers for providing straightforward methods to tailor the carrier density and/or install new functions. [ 9 ] In this study, we demonstrate such a general approach to fabricate a new type of organic phototransistor, which is capable of reversibly photomodulating the carrier density at the dielectric/semiconductor interface; this phototransistor was constructed using photochromic spiropyran (SP)-methyl methacrylate (MMA) copolymers (hereafter referred to as SP-co -MMA) as the photoresponsive gate dielectrics ( Figure 1 ). SP is a type of organic chemical compounds known for its photochromic properties; [ 10 ] it was chosen as the photosensitizer because SPs can revert back-and-forth between a neutral, closed form (SP-closed) and a zwitterionic, open form (SP-open) when exposed to light of different wavelengths. Such a unique conformational transition caused by the photoisomerization of SP molecules leads to a signifi cant modulation of the electric dipole moment ( P mol ) (≈6.4 D of SP-closed and ≈13.9 D of SP-open), [ 11 ] thus forming the basis of the development of novel photoswitchable sensors and functional optoelectronic devices. [ 12 ] In this case, reversible P mol changes of SPs in polymer dielectrics result in two distinct capacitance values that induce different capacitive coupling. In addition, under UV irradiation, SPs at the dielectric/semiconductor interface could change from a neutral form (SP-closed) to a charge-separated form (SP-open), thus producing scattering sites that can trap the photoexcited electrons and correspondingly leave hole carriers in the conductive channel. A synergistic combination of both effects realizes the photomodulation of the threshold voltage ( V T ) values, and thus channel conductance. This study is established from previous cases where SP was simply mixed with poly(methyl methacrylate) (PMMA) as the gate dielectric; unfortunately, the SP concentration was signifi cantly limited by its low solubility in PMMA. [ 9d,f ] The important distinction in this study is that the use of SP-co -MMA copolymers allows for the substantial tuning of the SP ratios in polymer dielectrics, thus signifi cantly Organic fi eld-effect transistors (OFETs) are the basic building blocks in numerous f...

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Functional Single-Walled Carbon Nanotube-based Molecular Devices

Cited by 4 publications

References 7 publications

Molecular-Scale Electronics: From Concept to Function

Molecular-Scale Electronics: From Concept to Function

Summary and Perspectives

Synergistic Photomodulation of Capacitive Coupling and Charge Separation Toward Functional Organic Field‐Effect Transistors with High Responsivity

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