[25p-P04-1~4] 9.4 Thermoelectric conversion

[25p-P04-2] Ag incorporated Cu₂SnS₃ Thermoelectrics

〇Sigeyuki Nakamura¹, Tomaki Nakano¹, Tatsuki Takahashi¹, Towa Okazaki¹, Sota Torigoe¹, Shin-ya Shiga², Hideaki Araki³, Yoji Akaki⁴, Masatoshi Takeda⁵ (1.NIT Tsuyama Col., 2.NIT Niihama Col., 3.NIT Nagaoka Col., 4.NIT Miyakonojo, 5.Nagaoka Univ. Tech.)

Keywords:thermoelectrics, copper tin sulfide, solid solution

Cu₂SnS₃ has a high Seebeck coefficient S and a low thermal conductivity κ, and is expected to be a thermoelectric material composed of abundant, inexpensive, and less toxic elements. In the past, silver was added at the time of synthesis, but this time, silver was added at the time of sintering in order to adjust the silver composition ratio of the sample more precisely, which is a kind of modulation doping. As a result, S deteriorated by a factor of about 0.7, while electrical conductivity σ and κ improved by a factor of 1.5 and 0.7, respectively, resulting in a ZT improvement of about 1.3.