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The ability of a thermoelectric material to be used for electric generators is measured through its thermoelectric figure of merit (ZT) which is directly related to the device efficiency. Figure of merit of a material is dependent on three transport quantities, electrical conductivity (σ...
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Format: | Final Project |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/28649 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | The ability of a thermoelectric material to be used for electric generators is measured through its thermoelectric figure of merit (ZT) which is directly related to the device efficiency. Figure of merit of a material is dependent on three transport quantities, electrical conductivity (σ), Seebeck coefficient or thermoelectric power (S), and thermal conductivity which comes from lattice vibration (κph) and charge carriers (κe). The three transport quantities is being calculated through Boltzmann <br />
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Transport Theory using two assumption, linearisation of perturbation, and the relaxation time approximation (RTA). Investigation of transport properties is being made for Dirac materials, which is a new material classification, notably for its unique effective carrier behaviour in the vicinity of Fermi energy, compared to the standard materials. Considering only the single band E > 0, for both case of Dirac materials, the gapless and gapped energy, the obtained ZT values can be higher than the reference semiconductor case, or even the maximum value of current <br />
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thermoelectric materials which is about 1. In extreme cases, its value even become significantly large and non-saturating for α = 0. Here, two physical quantities have <br />
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to be met to achieve the preferred zT value, the phonon thermal conductivity and a range of temperature. |
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