Abstract
Anisotropic thermopower, S, in zigzag and armchair 2D phosphorene is investigated using Boltzmann transport formalism. Anisotropic behavior of thermopower shows that thermopower along armchair direction is higher than that of zigzag direction. The theoretical studies of S and its dependence on the temperature, T, carrier concentration, n s, and phonon mean free path, λ, bring out the features of anisotropic thermopower. The limitations of the often used Mott expression for the analysis of thermopower are brought out. For the range of carrier concentration, 1016 < n s < 1018 m−2, the anisotropic ratio of S varies from 3.1 to 2.3 at room temperature. The modification in the behavior of S from anisotropic to low anisotropic for higher carrier concentration and at lower temperature is noticed. These theoretical investigations are in good agreement with recent experimental results.
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