| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
|
| Presentation Title |
Characterization of n-type Bismuth Telluride Processed via Selective Laser Melting |
| Author(s) |
Ryan Welch, Haidong Zhang, Saniya LeBlanc |
| On-Site Speaker (Planned) |
Ryan Welch |
| Abstract Scope |
Thermoelectric modules are solid-state energy conversion devices that are used in thermal management and waste heat recovery applications. Additive manufacturing of thermoelectric materials may offer advantages through influencing material transport properties: Seebeck coefficient, thermal conductivity, and electrical conductivity. This work investigates selective laser melting of n-type bismuth telluride (Bi2Se0.3Te2.7). We manufactured ingots of bismuth telluride and analyzed the meso-, micro- and nanostructure via optical and electron microscopy. Scanning electron and optical microscopy results showed the laser melted samples had a high porosity and non-equiaxed grain structure. Energy dispersive spectroscopy line scans revealed varying concentrations of constituent elements. Transmission electron microscopy confirmed the existence of nanoscale bismuth oxide inclusions within the sample. We concluded that the shift in primary charge carriers from electrons to holes was due to oxide formations throughout the material. |