Google Search
A2: Medium temperature materials
1 IMRA Europe S.A.S. Sophia Antipolis, France2 Institute of Applied Physics, University of Hamburg, Germany3 Interdisciplinary Center for Advanced Materials Simulations, Ruhr University Bochum, Germany
Large deployment of thermoelectric generators (TEG) for waste heat recovery (WHR) will require the development of new, low cost and innocuous materials with competitive physical properties. Bismuth Sulfide has been recently shown by Biswas et al. to have a significant TE potential, especially when doped with BiCl3. In order to assess whether higher performances could be reached with this very materials, we have performed first principle calculations of the formation energy of a large number of point defects in the Bi2S3 crystal. We have then synthesized doped Bi2S3 ingots by quartz ampoule method, and subsequently Spark Plasma Sintered (SPS) them into pellets. These latters have been characterized both electrically (Seebeck coefficient, conductivity) and morphologically (SEM, XRD). The influence of various metal chlorides has been studied. To confirm the high power factor values measured on our Bi2S3 based samples (above 500 µW.K-2.m-1), we have realized a 22 leg devices that was found efficient to power a fan using a temperature difference of less than 70°C (100°C to 30°C).
