Anomalous electrical transport properties of CdSe quantum dots at and below room temperature
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Anomalous electrical transport properties of CdSe quantum dots at and below room temperature
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| Creator |
Sinha, Subhojyoti
Chatterjee, Sanat Kumar Ghosh, Jiten Meikap, Ajit Kumar |
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| Subject |
Crystal Chemistry, Thermodynamics, Phase Equilibria
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| Description |
Here we report the dielectric relaxation and anomalous ac conduction behavior of CdSe quantum dots in the temperature (T) range of 77 K <= T <= 300 K and in the frequency (f) range of 100 Hz <= f <= 1 MHz. Interfacial polarization exhibits strong temperature dependence only above 250 K and dielectric loss spectrum undergoes a shallow minimum. Superlinear power law behavior of the ac conductivity was observed above certain frequencies, along with the universal dielectric response at comparatively lower frequencies. Extraction of the temperature dependent dc contribution, hopping frequencies, frequency exponents and activation energies values were done by theoretical fitting and was observed that for T=77-200 K, classical hopping over barrier (HOB) is the prevailing charge transport mechanism whereas for T=250-300 K, the charge transport mechanism is correlated barrier hopping (CBH). Analysis of the Nyquist plotting and non-Debye electric modulus spectra have also been conferred in this context. (C) 2013 Elsevier B.V. All rights reserved.
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| Publisher |
Elsevier
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| Date |
2014-04
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/2620/1/jiten.pdf
Sinha, Subhojyoti and Chatterjee, Sanat Kumar and Ghosh, Jiten and Meikap, Ajit Kumar (2014) Anomalous electrical transport properties of CdSe quantum dots at and below room temperature. Physica B-Condensed Matter, 438. pp. 70-77. ISSN 0921-4526 |
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| Relation |
http://cgcri.csircentral.net/2620/
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