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Hot electrons injection in carbon nanotubes under the influence of quasi-static ac-field

Show simple item record Amekpewu, M. Mensah, S. Y. Musaha, R. Mensah, N. G. Abukari, S. S. Dompreh, K. A. 2021-10-12T10:41:39Z 2021-10-12T10:41:39Z 2015
dc.identifier.issn 23105496
dc.description 18p:, ill. en_US
dc.description.abstract Hot electrons injection in carbon nanotubes (CNTs ) where in addition to applied dc field (E), there exist simultaneously a quasi-static ac electric field (i.e. when the frequency ω of ac field is much less than the scattering frequency v (ω v or ωτ 1, v = τ−1, where τ is relaxation time) is considered. The investigation is done theoritically by solving semiclassical Boltzmann transport equation with and without the presence of the hot electrons source to derive the current densities. Plots of the normalized current density versus dc field (E) applied along the axis of the CNTs in the presence and absence of hot electrons reveal ohmic conductivity initially and finally negative differential conductivity (NDC) provided ωτ 1 (i.e. quasi- static case). With strong enough axial injection of the hot electrons, there is a switch from NDC to positive differential conductivity (PDC) about E ≥ 75kV/cm and E ≥ 140kV/cm for a zigzag CNT and an armchair CNT respectively. Thus, the most important tough problem for NDC region which is the space charge instabilities can be suppressed due to the switch from the NDC behaviour to the PDC behaviour predicting a potential generation of terahertz radiations whose applications are relevance in current-day technology, industry, and research en_US
dc.language.iso en en_US
dc.publisher University of Cape Coast en_US
dc.title Hot electrons injection in carbon nanotubes under the influence of quasi-static ac-field en_US
dc.type Article en_US

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