Rectification of current responds to incorporation of fullerenes into mixed-monolayers of alkanethiolates in tunneling junctions

Qiu, Li; Zhang, Yanxi; Krijger, Theodorus L.; Qiu, Xinkai; Hof, P.; Hummelen, Jan C.

doi:10.1039/c6sc04799h

Cited by 52 publications

(83 citation statements)

References 70 publications

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“…In contrast, the mixed SAMs showed that including even small quantities of disulfide or acetate derivatives into a SAM results in a significantly reduced rectification ratio. The SC 11 This finding indicated that a subtle supramolecular structure change significantly affects Fc-based molecular diode performance.…”

Section: Performance Of Molecular Diodes In Mixed Sam-based Junctionsmentioning

confidence: 89%

“…[24] In 2010, Burkhardt et al [25] reported on the concept of an electrically programmable selfassembled molecular charge storage layer for organic thinfilm transistors (OTFTs). [11] Copyright 2017, The Royal Society of Chemistry. [11] Copyright 2017, The Royal Society of Chemistry.…”

Section: Molecular Memory Devices Based On Mixed Samsmentioning

confidence: 99%

“…[2c,7] Most www.advelectronicmat.de 2. [11] 3. The exchange reaction kinetics depends on intermolecular packing force and incubation conditions such as incubation time, temperature, and solvent.…”

Section: Introductionmentioning

confidence: 99%

“…Watcharinyanon et al [16] formed mixed SAMs composed of ferroceneterminated (11-ferrocene-1-undecanethiolate; denoted as SC 11 Fc) and unsubstituted (n-decanethiolate; denoted as SC 10 ) n-alkanethiolates on a gold substrate. The adsorption of SC 11 Fc enhanced the gold surface work function, suggesting that the net dipole arising from ferrocene moiety and that arising from n-alkanethiolate have opposite directions. The authors found that dilution with SC 10 led to decreased work function of the gold surface, with the degree of work function change related to the SC 10 portion.…”

Section: Introductionmentioning

confidence: 99%

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Mixed Molecular Electronics: Tunneling Behaviors and Applications of Mixed Self‐Assembled Monolayers

Kong

Byeon

Park

et al. 2020

Adv Elect Materials

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studies have relied on homogeneous, pure SAMs, that is, SAMs composed of one type of molecules. Contamination or dilution of a homogenous SAM by different molecules has typically been considered to cause negative effects because increased heterogeneity can directly translate into (supra)molecular and electronic structural changes, which can hinder the achievement of desired device performance.Although the field of molecular and organic electronics has long utilized pure molecular systems, studies on how charges traverse across multicomponent molecular systems have only recently emerged. [8] This review article focuses on the emergence of, and recent advances in mixed molecular electronics, defined as an electronics field exploiting heterogeneous molecular systems such as mixed SAMs (Figure 1). In this article, we introduce and discuss charge transport behaviors in mixed SAMs and applications for mixed molecular electronics. We further aim to provide a rational perspective on the unique features of mixed molecular systems with an eye toward potential molecular and nanoelectronics applications. Supramolecular and Electronic Structures of Mixed SAMs Supramolecular Structure of Mixed SAMsDiluting a pure, single-component SAM with another molecule leads to a mixed SAM. Depending on the number of molecular species comprising a mixed SAM, such a molecular dilution can yield binary, ternary, quaternary mixed SAMs, and so on. Mixed SAMs can be formed by several methods. Among others, the following three methods are commonly employed.

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Section: Performance Of Molecular Diodes In Mixed Sam-based Junctionsmentioning

confidence: 89%

Section: Molecular Memory Devices Based On Mixed Samsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mixed Molecular Electronics: Tunneling Behaviors and Applications of Mixed Self‐Assembled Monolayers

Kong

Byeon

Park

et al. 2020

Adv Elect Materials

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“…Molecular diodes have been attracting much attention recently, both in self-assembled monolayers [1][2][3][4][5][6][7] and on the single-molecule scale. [8][9][10][11][12][13][14][15][16] Even though the rectifier has been the seminal device which launched the field of single-molecule electronics, 17 up to date, their performance have many shortcomings.…”

mentioning

confidence: 99%

Design of an efficient coherent multi-site single-molecule rectifier

Perrin

Doelman

Eelkema

et al. 2017

Phys. Chem. Chem. Phys.

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aWe propose the design of a single-molecule diode with a rectification ratio exceeding a million. The employed mechanism is based on coherent resonant charge transport across a molecule that consists of four conjugated sites coupled by non-conjugated bridges. Using density functional theory calculations, we rationalize the design of the molecule and demonstrate the crucial role of aligning the sites at a specific voltage. Rectification ratios are calculated for a series of chemical substituents and demonstrate that with careful molecular design, high rectification ratios can be achieved. Finally, we comment on the shortcomings of our approach, how further improvements can be obtained and discuss some of the experimental challenges.Molecular diodes have been attracting much attention recently, both in self-assembled monolayers 1-7 and on the single-molecule scale. [8][9][10][11][12][13][14][15][16] Even though the rectifier has been the seminal device which launched the field of single-molecule electronics, 17 up to date, their performance have many shortcomings. In particular, their rectification ratios (RR) are orders of magnitude lower than typical semiconducting rectifiers. The highest RR reported experimentally on a single-molecule junction 15 is about 600, and is no match for a semiconducting diode where ratios exceeding 10 6 are common. In that study, a molecular backbone was considered which consisted of two identical, weakly-coupled conjugated parts. In such a system, current flows coherently when both halves are on resonance, i.e., the sites are aligned with each other within the bias window. The alignment of the two sites can be modified by applying a bias voltage and/or by chemical substituents. With proper design, one can align the sites at zero bias, while misaligning them at finite bias, yielding negative differential conductance. 18 One can also align the sites at a finite bias, 15,19-22 and achieve single-molecule rectification.Based on a similar principle, here we investigate theoretically how the rectification ratio of single-molecule diodes can be significantly enhanced by the addition of more sites in series, as shown in as presented in Fig. 1b. Low RR are primarily caused by a high reverse current. Adding more sites in series leads to a strong suppression of the reverse current, thereby drastically improving the RR. However, the addition of sites comes at the cost of an increased molecular complexity and number of model parameters. In this study, we first focus on the design of a molecule which behaves as having four sites in series. For this purpose, we use density functional theory (DFT) calculations. We then investigate how the molecule can be engineered by the means of chemical substitution to align the sites at a particular bias voltage. We eventually show that the molecule designed with four sites represents a drastic improvement compared to a two-site molecule, with RR approaching 10 6 , competitive with siliconbased diodes.1 Design guidelines Fig. 1 depicts the concept of a rectifier...

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In Operando Modulation of Rectification in Molecular Tunneling Junctions Comprising Reconfigurable Molecular Self‐Assemblies

Qiu

Rousseva

et al. 2020

Advanced Materials

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Ever-evolving, modern computing hardware, from processors to memory storage, relies on electronic components of extremely small size and high energy efficiency. [1] Molecular tunneling junctions, in which the charge transport properties of molecules are exploited in devices, have considerable potential in this context because subtle changes at the atomic scale can translate into unique and useful effects at the device level. [2,3] By exploiting the chemical nature of molecular electronics, these effects are exemplified in photoisomerization, [4-8] , protonation, [9,10] electrostatic gating, [11,12] reduction-oxidation, [13] etc., giving rise to molecular resistors and molecular diodes in both

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Rectification of current responds to incorporation of fullerenes into mixed-monolayers of alkanethiolates in tunneling junctions

Abstract: This paper describes the rectification of current through molecular junctions comprising self-assembled monolayers of decanethiolate through the incorporation of C60 fullerene moieties in junctions using eutectic Ga–In (EGaIn) and Au conducting probe AFM top-contacts.

Cited by 52 publications

References 70 publications

Mixed Molecular Electronics: Tunneling Behaviors and Applications of Mixed Self‐Assembled Monolayers

Mixed Molecular Electronics: Tunneling Behaviors and Applications of Mixed Self‐Assembled Monolayers

Design of an efficient coherent multi-site single-molecule rectifier

In Operando Modulation of Rectification in Molecular Tunneling Junctions Comprising Reconfigurable Molecular Self‐Assemblies

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