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Published December 24, 2013 | Supplemental Material
Journal Article Open

Silicon-Based Thermoelectrics Made from a Boron-Doped Silicon Dioxide Nanocomposite

Abstract

We report a method for preparing p-type silicon germanium bulk alloys directly from a boron-doped silica germania nanocomposite. This is the first successful attempt to produce and characterize the thermoelectric properties of SiGe-based thermoelectric materials prepared at temperatures below the alloy's melting point through a magnesiothermic reduction of the silica-germania nanocomposite. We observe a thermoelectric power factor that is competitive with the literature record obtained for high energy ball milled nanocomposites. The large grain size in our hot pressed samples limits the thermoelectric figure of merit to 0.5 at 800 °C for an optimally doped Si_(80)Ge_(20) alloy.

Additional Information

© 2013 American Chemical Society. Publication Date (Web): December 5, 2013. Received: June 19, 2013; Revised: November 20, 2013. This work was supported by the Center for Energy Efficient Materials, an Energy Frontier Research Center, funded by the U.S. D.O.E., Office of Basic Energy Science, under Award No. DE-SC0001009. The MRL Central Facilities are supported by the MRSEC Program of the NSF under Award Nos. DMR05- 20415 and DMR11-21053, a member of the NSF-funded Materials Research Facilities Network. C.S.B. is a recipient of the Feodor Lynen Research Fellowship supported by the Alexander von Humboldt foundation. Y.Z. is a recipient of the Corning Fellowship, supported by the Corning Science Foundation. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. H.W., T.D., and G.J.S. thank NASA/JPL for support. Y.S. thanks NSFC (21103038) for support. We would like to thank Ben Curtin, Peter Burke, Dr. Thomas E. Mates, and Deryck Stave for their valuable insight and contributions.

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August 22, 2023
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