|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications X
||N-type Silver Chalcogenide with Excess Ag Leading to Improved Thermoelectric Properties
||You-Cheng Du, Wan-Ting Yen, Hsin-Jay Wu
|On-Site Speaker (Planned)
Nowadays bismuth tellurides are still the best thermoelectric materials at low temperature range because of their well performance in thermoelectric cooler. However, the silver chalcogenides have the advantages of earth-abundance and low-toxicity, which enhances their competitiveness in low temperature application. Single crystalline Ag2Se and Ag2Te were fabricated from the Bridgman method while the excess Ag was deposited by sputtering. The lattice thermal conductivity was further reduced by the highly mobile silver ions that introduce various scale of defects and enhance the phonon scattering. It was discovered that the slight composition difference in silver chalcogenides would lead to great variety of thermoelectric performance. Moreover, the excess Ag in our Ag2+x crystals increase electrical conductivity and bring enhanced power factor at the near room-temperature region, making the n-type silver chalcogenides as ideal candidates for n-type TE cooler.