Electrical conduction and electroluminescence of vacuum-evaporated thin TCNQ films

Kojima, K.; Maeda, Akinori; Ieda, Masayuki

doi:10.1109/14.142728

Cited by 4 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different studies in the research literature indicate that the TCNQ film texture depends strongly on the growth method, the used substrate and even on the experimental conditions. Thus, Kojima et al [18] grew a vacuum evaporated TCNQ-film oriented along (0 2 2) direction on a glass substrate which shows that the film crystallinity depends on the depositing temperature. Orientation implies that the TCNQ molecules lay flat to the substrate surface.…”

Section: Resultsmentioning

confidence: 99%

Cu diffusion as an alternative method for nanopatterned CuTCNQ film growth

Capitán¹,

Alvarez²,

Navío³

et al. 2016

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

In this paper we show by means of 'in situ' x-ray diffraction studies that CuTCNQ formation from Cu(solid)-TCNQ(solid tetracyanoquinodimethane) goes through Cu diffusion at room temperature. The film quality depends on the TCNQ evaporation rate. At low evaporation rate we get a single phase-I CuTCNQ film very well crystallized and well oriented. The film has a CuTCNQ(0 2 0) orientation. The film is formed by CuTCNQ nanorods of a very homogeneous size. The film homogeneity has also been seen by atomic force microscopy (AFM). The electronic properties of the film have been measured by x-ray photoelectron spectroscopy (XPS) and ultra-violet photoelectron spectroscopy (UPS). Thus, the Cu-diffusion method has arisen as a very simple, clean and efficient method to grow localized CuTCNQ nanorods on Cu, opening up new insights for technological applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Cu diffusion as an alternative method for nanopatterned CuTCNQ film growth

Capitán¹,

Alvarez²,

Navío³

et al. 2016

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…Despite the obvious resemblance between the experimental results and our simulations, many questions need to be answered before one can claim that our model is directly related to the experiment. First, TCNQ crystals are not conducting [36,37]. However they are believed to have a large (about 8) dielectric constant [38].…”

Section: Discussionmentioning

confidence: 99%

“…First, TCNQ crystals are not conducting [36,37]. However they are believed to have a large (about 8) dielectric constant [38].…”

Section: Discussionmentioning

confidence: 99%

Chiral patterns arising from electrostatic growth models

et al. 1998

View full text Add to dashboard Cite

Recently, unusual and strikingly beautiful seahorse-like growth patterns have been observed under conditions of quasitwo-dimensional growth. These 'S'-shaped patterns strongly break two-dimensional inversion symmetry; however such broken symmetry occurs only at the level of overall morphology, as the clusters are formed from achiral molecules with an achiral unit cell. Here we describe a mechanism which gives rise to chiral growth morphologies without invoking microscopic chirality. This mechanism involves trapped electrostatic charge on the growing cluster, and the enhancement of growth in regions of large electric field. We illustrate the mechanism with a tree growth model, with a continuum model for the motion of the one-dimensional boundary, and with microscopic Monte Carlo simulations. Our most dramatic results are found using the continuum model, which strongly exhibits spontaneous chiral symmetry breaking, and in particular finned 'S' shapes like those seen in the experiments.

show abstract

“…During the last few decades, tetracyanoquinodimethane (TCNQ) and its family of small polynitriles have been of much interest due to their ability to form complexes with both organic and metallic donors that exhibit wide varieties of optical, magnetic and electric properties, resulting in an increasing application in the development of molecular-scale devices. − A large number of these TCNQ studies are aimed at the understanding of the large strength of TCNQ as an electron acceptor and its ability to form stable charge-transfer complexes with both organic and metallic donors and its role in the optical and electrical properties of the compound. Furthermore, the acceptor properties of TCNQ arise from the strong electrophilic character of its two cyano terminations.…”

Section: Introductionmentioning

confidence: 99%

“…Works present in the literature show that the TCNQ film crystallinity and texture depends strongly on the used growth method, the substrate and even on the experimental growth conditions. Thus, Kojima et al 7 grew a crystalline TCNQ-film by evaporation under vacuum on glass substrate when it is grown at 280 °C, but it grew amorphous at a lower temperature. The crystalline film obtained by them is oriented along (022) direction indicating that the TCNQ molecules lay flat to the substrate surface.…”

Section: Introductionmentioning

confidence: 99%

TCNQ Grown on Cu (001): Its Atomic and Electronic Structure Determination

et al. 2016

View full text Add to dashboard Cite

In this paper we have resolved by means of “in situ” X-ray diffraction studies the atomic structure of the TCNQ films from 0.4 to 17 ML thickness grown on Cu(001) substrate. The film grown at low temperature, is a well crystallized and well oriented single phase. The TCNQ film has a (020) orientation. The electronic properties of the film have been studied by means of XPS and UPS spectroscopies. The measured electronic density has been compared to the theoretical ab-inito calculations. In this paper we have studied the structural and electronic properties of relatively thick films of TCNQ on Cu(100). Our results demonstrate that the strong charge transfer between the metallic substrate and the first layer of TCNQ molecules have important consequences for the film electronic and structural properties of films even as thick as 17 ML. From the structural point of view, the films grow with a well-defined (020) orientation that matches the modified molecular structure of the first layer. This first monolayer structure was previously explained in literature in terms of adsorbate-induced reconstruction of the Cu surface. From the electronic point of view, charge transfer leads to band bending and determines that barrier for electron injection across the metal/organic interface.

show abstract

Electrical conduction and electroluminescence of vacuum-evaporated thin TCNQ films

Cited by 4 publications

References 8 publications

Cu diffusion as an alternative method for nanopatterned CuTCNQ film growth

Cu diffusion as an alternative method for nanopatterned CuTCNQ film growth

Chiral patterns arising from electrostatic growth models

TCNQ Grown on Cu (001): Its Atomic and Electronic Structure Determination

Contact Info

Product

Resources

About