[21p-P09-1~10] 9.4 Thermoelectric conversion

[21p-P09-10] Effects of sulfur evaporation on the thermoelectric properties of Cu_3.1Ti_0.25Sn_0.9S₄ with a sphalerite-derived disordered structure

〇Shota Hirayama¹, Koichiro Suekuni¹, Philipp Sauerschnig², Michihiro Ohta², Michitaka Ohtaki¹ (1.Kyushu Univ., 2.AIST GZR)

Keywords:thermoelectric materials, sulfides

In our previous study, we have synthesized Cu_3.1Ti_0.25Sn_0.9S₄ with a sphalerite-derived disordered structure and revealed its relatively high thermoelectric figure of merit due to the low lattice thermal conductivity and relatively high power factor. The low thermal conductivity was attributed to the structural complexity; whereas, sulfur deficiency (formed during the sintering process) may also be responsible for scattering phonons. In this work, we prepared samples by sintering at different temperatures and investigated the effects of sulfur deficiency on the thermoelectric properties.