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

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 intrinsi...

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Bibliographic Details
Published in:Applied physics letters 2014-03, Vol.104 (13)
Main Authors: Mi, Wenlong, Qiu, Pengfei, Zhang, Tiansong, Lv, Yanhong, Shi, Xun, Chen, Lidong
Format: Article
Language:English
Subjects:
Applied physics
Carrier density
Figure of merit
Phase transitions
Power factor
Thermoelectricity
Transport
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4870509