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We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu_2CoTi_3S_8, which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction trea...tment produced Cu defects, resulting in Cu_<2−x>CoTi_3S_8 up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.続きを見る
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Mendeley出力
