Electrical conductivity of single crystals of triethylammonium-(TCNQ)2

Farges, J.; Brau, A.; Gutmann, F.

doi:10.1016/s0022-3697(72)80467-0

Cited by 33 publications

(9 citation statements)

References 6 publications

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“…Only E, and c3 were considered and they were found to be almost constant between 77 and 125 O K , with the approximate values : Lastly, we should mention that these results throw strong doubt on the abnormally high value of cl = 3400, a t lo3 Hz and 77 O K , we reported in a previous paper [8]. Similar dielectric anomalies were reported for such conventional materials as silicon and were subsequently accounted for by a strong influence from the contacts a t relatively low frequencies [9].…”

Section: Dielectric Constantmentioning

confidence: 81%

Study at 10⁸ and 2 × 10⁸ Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂

Farges

Brau

1974

Physica Status Solidi (b)

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The ac electrical conductivity and anisotropy, including an evaluation of the dielectric constant, a t 108 and 2 x 108 Hz in the range 77 to 350 O K is investigated. A hopping mechanism is evidenced from the dispersion of conductivity observed below 200 OK, and is associated with the existence of tails of localized states a t the edges of a band gap. The vanishing dispersion in the upper temperature range is likely to indicate that an interband transition process may then become important for conduction.Nous pr6sentons une etude de la conductivit6 Blectrique et de son anisotropie, comprenant aussi une 6valuation de la constante dielectrique, & lo8 e t 2 x lo8 Hz entre 77 e t 350 OK.La dispersion de la conductivit6, observee au dessous de 200 OK, met en Bvidence un processus de conduction par sauts qui peut btre attribu6 8. l'existence de ,,queues" #&tats localises aux extrBmit6s de la bande interdite du semiconducteur. L'absence de dispersion des temperatures superieures pourrait indiquer qu'un processus de transitions bande 8. bande devient alors predominant vis 8. vis de la conduction.

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Section: Dielectric Constantmentioning

confidence: 81%

Study at 10⁸ and 2 × 10⁸ Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂

Farges

Brau

1974

Physica Status Solidi (b)

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“…The spectum of TEA(TCNQ)2 is typical of semiconducting organic crystals [27] below the phase transition temperature Tp as well as above Tp . In the former T-range it is evident because the electrical transport study [6,7] shows the semiconducting properties of TEA(TCNQ)2. However, above Tp electrical conductivity is relatively high -the value of σd.c.…”

Section: Resultsmentioning

confidence: 99%

“…TEA(TCNQ)2 is generally considered as a good 1D semiconductor (σRT ≈ 7 Ω-1 cm -1 ) in which T-dependence of the longitudinal d.c. conductivity observed in a large crystal shows an anomaly in the slope of log σ vs. T-1 at 220 K [6,7]. On the other hand, a number of conductivity jumps have been observed only when small single crystals have been investigated [8].…”

Section: Introductionmentioning

confidence: 94%

Temperature Study of the Polarized Reflectivity of TEA(TCNQ)₂Single Crystal

Olejniczak

Graja

1993

Acta Phys. Pol. A

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The infrared reflection spectra of the organic quasi-one-dimensional semiconductor triethylammonium (TCNQ)2 between 80 and 300 K are reported. Characteristic changes in the temperature dependencies of the bands assigned to the donor vibrations are observed. An interpretation of the electron-molecular vibration coupling in terms of the dimer theory is discussed. It is concluded that the thermal evolution of the spectrum corroborates the semiconductor-semiconductor type of phase transition attributed to the cation disorder.

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“…The compaction was obtained using the procedure described in [6] and was investigated twice, with the contact faces first uncoated and then coated with Ag paint. I n contrast to our study on crystals, the coating of the compaction did not introduce any difference in the data (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Dependence of the Thermopower on Temperature and Crystal Direction in the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂¹)

Parges

Brau

1974

Physica Status Solidi (b)

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An investigation is made of the thermopower in the three available directions of crystals of TEA(TCNQ), and on a moulding pellet a t temperatures between 100 and 300 O K . The thermopower is found to be highly anisotropic with an anomalous sign for one direction; i t is negative in the directions of highest and lowest electrical conductivity but positive in the direction of intermediate conductivity.Nous presentons une etude du pouvoir thermoelectrique sur des cristaux de TEA(TCNQ),, suivant les trois directions cristallines, ainsi que sur un barreau de poudre comprimee, entre 100 et 300 O K . Le pouvoir thermoelectrique est trhs anisotrope et presente un changement de signe dans une direction: il est nhgatif dans les directions de plus haute et plus basse conductivitbs, mais positif dans la direction de conductivite interm6diaire.

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Electrical conductivity of single crystals of triethylammonium-(TCNQ)2

Cited by 33 publications

References 6 publications

Study at 10⁸ and 2 × 10⁸ Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂

Study at 10⁸ and 2 × 10⁸ Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂

Temperature Study of the Polarized Reflectivity of TEA(TCNQ)₂Single Crystal

Dependence of the Thermopower on Temperature and Crystal Direction in the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂¹)

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Electrical conductivity of single crystals of triethylammonium-(TCNQ)2

Cited by 33 publications

References 6 publications

Study at 108 and 2 × 108 Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)2

Study at 108 and 2 × 108 Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)2

Temperature Study of the Polarized Reflectivity of TEA(TCNQ)2Single Crystal

Dependence of the Thermopower on Temperature and Crystal Direction in the Highly Anisotropic Organic Semiconductor TEA (TCNQ)21)

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Product

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Study at 10⁸ and 2 × 10⁸ Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂

Study at 10⁸ and 2 × 10⁸ Hz of the Electrical Conductivity and Dielectric Constant of the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂

Temperature Study of the Polarized Reflectivity of TEA(TCNQ)₂Single Crystal

Dependence of the Thermopower on Temperature and Crystal Direction in the Highly Anisotropic Organic Semiconductor TEA (TCNQ)₂¹)