Thermoelectric transport of Se-rich Ag2Se in normal phases and phase transitions

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  • Wenlong Mi
    State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences 1 , 1295 Dingxi Road, Shanghai 200050, China
  • Pengfei Qiu
    State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences 1 , 1295 Dingxi Road, Shanghai 200050, China
  • Tiansong Zhang
    CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences 2 ,1295 Dingxi Road, Shanghai 200050, China
  • Yanhong Lv
    State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences 1 , 1295 Dingxi Road, Shanghai 200050, China
  • Xun Shi
    State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences 1 , 1295 Dingxi Road, Shanghai 200050, China
  • Lidong Chen
    State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences 1 , 1295 Dingxi Road, Shanghai 200050, China

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<jats:p>Small amount of Se atoms are used to tune the carrier concentrations (nH) and electrical transport in Ag2Se. Significant enhancements in power factor and thermoelectric figure of merit (zT) are observed in the compositions of Ag2Se1.06 and Ag2Se1.08. The excessive Se atoms do not change the intrinsically electron-conducting character in Ag2Se. The detailed analysis reveals the experiment optimum carrier concentration in Ag2Se is around 5 × 1018 cm−3. We also investigate the temperature of maximum zT and the thermoelectric transport during the first order phase transitions using the recently developed measurement system.</jats:p>

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