Frequency dependent electrical transport properties of 4,4′,4″-tris(N-3-methylphenyl-N-phenylamine)triphenylamine by impedance spectroscopy
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Frequency dependent electrical transport properties of 4,4′,4″-tris(N-3-methylphenyl-N-phenylamine)triphenylamine by impedance spectroscopy
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| Creator |
Chauhan, Gayatri
Srivastava, Ritu Tyagi, Priyanka Kumar, Amit Srivastava, P. C. Kamalasanan, M. N. |
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| Subject |
Materials Science
Physics Polymer Science |
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| Description |
The frequency dependent ac conduction mechanism in 4,4′,4″-tris(N-3-methylphenyl-N-phenylamine)triphenylamine (m-MTDATA) has been studied as a function of applied bias and temperature. The Cole–Cole plot shows a slightly depressed semicircle indicating Debye type relaxation. This result has been explained by an equivalent circuit of the device designed as a two parallel resistor and capacitance network in series with contact resistance. The ac conduction studies under dc bias for hole only devices shows an increase in device conductivity with the increase in bias. The variation of bulk resistance with applied bias indicates Space Charge Limited Conduction (SCLC) mechanism for hole conduction. The hole mobility of the material has also been evaluated from SCLC as 8.859 × 10−6 cm2/V s. The temperature dependent impedance studies show two activation energies indicating two different phase of the material with a phase transition at 235 K.
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| Publisher |
Elsevier
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| Date |
2010-04-23
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/167/1/139.pdf
Chauhan, Gayatri and Srivastava, Ritu and Tyagi, Priyanka and Kumar, Amit and Srivastava, P. C. and Kamalasanan, M. N. (2010) Frequency dependent electrical transport properties of 4,4′,4″-tris(N-3-methylphenyl-N-phenylamine)triphenylamine by impedance spectroscopy. Synthetic Metals, 160 (13-14). pp. 1422-1426. ISSN 0379-6779 |
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| Relation |
http://dx.doi.org/10.1016/j.synthmet.2010.04.022
http://npl.csircentral.net/167/ |
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