Electrical transport properties of consolidated ZnSe quantum dots at and above room temperature |
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Institution: | 1. Department of Physics, National Institute of Technology, Durgapur, Durgapur 713209, West Bengal, India;2. CSIR-Central Glass and Ceramic Research Institute, Kolkata, Kolkata 700032, West Bengal, India |
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Abstract: | Here we report a comprehensive study on the prevailing conduction mechanism and dielectric relaxation behavior of consolidated Zinc Selenide quantum dots in the frequency range of 1 kHz ≤ f ≤ 1.5 MHz and in the temperature range of 298K ≤ T ≤ 573 K. The ac conductivity increases either with increase in temperature or with increase in frequency, which is explained by the Jonscher Power law. At higher temperatures, correlated barrier hopping is found to be the prevalent charge transport mechanism with a maximum barrier height of 0.88 eV. The dielectric constant of the sample is found to exhibit weak temperature dependence. DC conductivity study reveals the semiconducting nature of the sample and it is discussed in the light of polaron hopping conduction. From the impedance spectroscopic study, role of the grains and grain boundaries in the overall electrical transport properties have been elucidated by considering an electrical equivalent circuit (composed of resistances and constant phase elements). Electric modulus study reveals non-Debye responses of the sample in the experimental range. |
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Keywords: | Quantum dots Disordered systems Dielectric response Electrical transport Impedance spectroscopy |
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