About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Synthesis and Thermoelectric Properties of ACu7Q4 Sulfoselenides |
| Author(s) |
James Hodges |
| On-Site Speaker (Planned) |
James Hodges |
| Abstract Scope |
Copper-containing chalcogenides continue to attract interest from the thermoelectric community due to low thermal conductivity that is attributed to the liquid-like Cu sublattice. This feature facilitates high zT values but the mobility of Cu+ cations ultimately results in device failure over time. Our group is exploring chemical strategies for controlling Cu+ transport in thermoelectrics and other applications. Here, I will discuss work regarding the thermoelectric properties of ACu7Q4 sulfoselenides. Although these materials have a superionic phase transition below room temperature, the temperature of the transition and the magnitude of ionic transport can be controlled using alloying strategies. Impedance spectroscopy shows the mixed-chalcogen compositions exhibit lower Cu+ migration than the sulfide end member, and the doped p-type material is found to have a zT maximum of 0.5 at 450°C without hysteresis or failure after several hours. The study highlights a promising tool for improving the stability of Cu chalcogenide thermoelectrics. |