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(a) Magnitude of the Seebeck coefficient, , (circles, left axis) and conductivity, , (squares, right axis) as a function of carrier concentration for the La-doped films in this study (filled symbols) and for single crystals in the literature (open symbols). The literature data is from Refs. 1 and 2. The solid line depicts the carrier concentration dependence of according to Eq. (1). The dashed line is a fit to the conductivity data. (b) The power factor of La-doped films, , as a function of carrier concentration. The dashed line is the calculated power factor from the fits to the Seebeck coefficient and the conductivity data shown in (a).
Carrier concentrations and Seebeck coefficients for delta-doped superlattices as a function of the number of delta-doped layers. The measured 2D (sheet) carrier concentration is . The 3D carrier concentration, which is derived from , is reported in two different ways, and , where is defined as and as .
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