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- W2340432931 abstract "In-plane Seebeck coefficient of porous Si free-standing membranes of different porosities was accurately measured at room temperature. Quasi-steady-state differential Seebeck coefficient method was used for the measurements. A detailed description of our home-built setup is presented. The Seebeck coefficient was proved to increase with increasing porosity up to a maximum of ~1 mV/K for the ~50 % porosity membrane, which is more than a threefold increase compared to the starting highly doped bulk c-Si substrate. By further increasing porosity and after a maximum is reached, the Seebeck coefficient sharply decreases and stabilizes at ~600 μV/K. The possible mechanisms that determine this behaviour are discussed, supported by structural characterization and photoluminescence measurements. The decrease in nanostructure size and increase in carrier depletion with increasing porosity, together with the complex structure and morphology of porous Si, are at the origin of complex energy filtering and phonon drag effects. All the above contribute to the observed anomalous behaviour of thermopower as a function of porosity and will be discussed." @default.
- W2340432931 created "2016-06-24" @default.
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- W2340432931 date "2016-04-14" @default.
- W2340432931 modified "2023-10-18" @default.
- W2340432931 title "High Seebeck Coefficient of Porous Silicon: Study of the Porosity Dependence" @default.
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- W2340432931 doi "https://doi.org/10.1186/s11671-016-1411-z" @default.
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