2021年第82回応用物理学会秋季学術講演会

講演情報

一般セッション(口頭講演)

9 応用物性 » 9.4 熱電変換

[10a-N406-1~10] 9.4 熱電変換

2021年9月10日(金) 09:15 〜 12:00 N406 (口頭)

竹内 恒博(豊田工大)、中村 芳明(阪大)

10:00 〜 10:15

[10a-N406-4] Optimizing the Condition for High Thermoelectric Performance of Flexible Ag2(S,Se) Material through Synergic Approach

〇(PC)Saurabh Singh1,2、Keisuke Hirata1、Masaharu Matsunami1、Tsunehiro Takeuchi1,2,3 (1.TTI Nagoya Japan、2.CREST, Tokyo Japan.、3.MIRAI, Japan)

キーワード:Chalcogenides, Thermoelectrics, Flexible thermoelectric

Recently, Ag2S is found to be an interesting thermoelectric material with good flexibility. However, the value of ZT was found to be very low due to large electrical resistivity. To improve the ZT, the partial substitutions of Se, Te at sulfur site are investigated. Interestingly, the ductile nature of Ag2S material found to be excellent with Se substitutions at sulfur site compositions, and the maximum ZT of 0.6 at 300 K is achieved near room temperature. In this study, therefore, we modify the electronic structure of Ag2S1-xSex by non-toxic 3d transition metal elements substitution on Ag site. By this approach we successfully improve the S and achieved an effective increase of ZT near 300 K. We confirmed that n-type behavior was kept unchanged regardless of the substitutions. Notably, we found condition where S was increased while the small magnitudes of resistivity and k were maintained. As a result, large magnitudes both in power factor and ZT = 0.8 at 310 K, were obtained.