Control of molecular orientation in TTF–TCNQ co-evaporated films by applying an electric field

Kato, Nobuko; Fujimura, Masaaki; Kuniyoshi, Shigekazu; Kudo, Kazuhiro; Hara, Masahiko; Tanaka, Kuniaki

doi:10.1016/s0169-4332(98)00134-2

Cited by 23 publications

(14 citation statements)

References 7 publications

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“…27 However, it should be mentioned that for CT salts containing D and A with very distinct sublimation temperatures, only the co-evaporation of the materials is viable. 29 One of the highest motivations for using organic electrodes is the possibility of reducing the contact resistance. 29 One of the highest motivations for using organic electrodes is the possibility of reducing the contact resistance.…”

Section: Evaporated Ct Saltsmentioning

confidence: 99%

Organic metal engineering for enhanced field-effect transistor performance

Pfattner

Rovira

Mas‐Torrent

2015

Phys. Chem. Chem. Phys.

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A key device component in organic field-effect transistors (OFETs) is the organic semiconductor/metal interface since it has to ensure efficient charge injection. Traditionally, inorganic metals have been employed in these devices using conventional lithographic fabrication techniques. Metals with low or high work-functions have been selected depending on the type of semiconductor measured and, in some cases, the metal has been covered with molecular self-assembled monolayers to tune the work function, improve the molecular order at the interface and reduce the contact resistance. However, in the last few years, some approaches have been focused on utilizing organic metals in these devices, which have been fabricated by means of both evaporation and solution-processed techniques. Higher device performances have often been observed, which have been attributed to a range of factors, such as a more favourable organic/organic interface, a better matching of energy levels or/and to a reduction of the contact resistance. Further, in contrast to their inorganic counterparts, organic metals allow their chemical modification and thus the tuning of the Fermi level. In this perspective paper, an overview of the recent work devoted to the fabrication of OFETs with organic metals as electrodes will be carried out. It will be shown that in these devices not only is the matching of the HOMO or LUMO of the semiconductor with the metal work-function important, but other aspects such as the interface morphology can also play a critical role. Also, recent approaches in which the use of organic charge transfer salts as buffer layers at the metal contacts or on the dielectric or as doping agents of the organic semiconductors that have been used to improve the device performance will be briefly described.

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Section: Evaporated Ct Saltsmentioning

confidence: 99%

Organic metal engineering for enhanced field-effect transistor performance

Pfattner

Rovira

Mas‐Torrent

2015

Phys. Chem. Chem. Phys.

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“…To control the orientation of organic semiconductor crystals, several approaches have been reported, such as mechanical rubbing [5][6][7], electric orientation [8,9], use of a low symmetry substrate surface [10][11][12][13], and use of vicinal steps [14]. Among these approaches, we focused attention on the use of vicinal steps since it can be applied to epitaxial growth on inorganic semiconductor substrates of large area.…”

Section: Introductionmentioning

confidence: 99%

Effects of vicinal steps on the island growth and orientation of epitaxially grown perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) thin film crystals on a hydrogen-terminated Si(1 1 1) substrate

Sazaki

Fujino

Usami

et al. 2005

Journal of Crystal Growth

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“…It was then reduced to 43.2 C and kept in the range of 43.2-43.3 C. The optimum substrate temperature was empirically determined to be 43.2 C; it provided a quasi-thermal equilibrium for growing TTF-TCNQ crystals. [20][21][22][27][28][29]33 After 30 min, the substrate temperature was gradually lowered to 41.5 C. During this time range, the system gradually deviated from thermal equilibrium.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4][5][6] In addition, novel and general molecular manipulation technologies are desired for both macroscale and nanoscale applications. Of the many chemical or physical techniques that have been proposed for site and orientation selective growth, the application of external magnetic [7][8][9][10][11][12][13][14][15][16][17][18][19] and electric [20][21][22][23][24][25][26] fields is expected to be widely applicable due to its controllability and universality. However, the effects of external fields are believed to be extremely weak and short ranged.…”

mentioning

confidence: 99%

“…For example, we fabricated and demonstrated a self-aligned organic nanochannel transistor [27][28][29] by using the effect of an electric field on tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) crystal growth. [20][21][22] However, the dynamic processes of organic crystal growth under an external electric field have not been studied. Therefore, this study focuses on the initial and dynamic growth process of TTF-TCNQ wires under a static electric field.…”

mentioning

confidence: 99%

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In-situ observation of electric-field-induced acceleration in crystal growth of tetrathiafulvalene-tetracyanoquinodimethane

Sakai

Kuniyoshi

Iizuka

et al. 2013

Journal of Applied Physics

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In-situ observations of vapor-phase growth of tetrathiafulvalene (TTF)-tetracyanoquinodimethane (TCNQ) crystals under an electric field were conducted without influencing the actual crystal growth process. The shortest incubation time of TTF-TCNQ nuclei and the highest initial growth rate of the crystals are obtained on the anode side and in high electric field regions. It is demonstrated that the distribution of molecules thermally diffusing on the substrate surface is controlled by an external electric field. These results indicate the potential for selective growth of highly conductive organic wires for micro- and nanoscale wiring in organic nanodevices.

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Control of molecular orientation in TTF–TCNQ co-evaporated films by applying an electric field

Cited by 23 publications

References 7 publications

Organic metal engineering for enhanced field-effect transistor performance

Organic metal engineering for enhanced field-effect transistor performance

Effects of vicinal steps on the island growth and orientation of epitaxially grown perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) thin film crystals on a hydrogen-terminated Si(1 1 1) substrate

In-situ observation of electric-field-induced acceleration in crystal growth of tetrathiafulvalene-tetracyanoquinodimethane

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