The 81st JSAP Autumn Meeting, 2020

Presentation information

Oral presentation

9 Applied Materials Science » 9.4 Thermoelectric conversion

[8a-Z18-1~11] 9.4 Thermoelectric conversion

Tue. Sep 8, 2020 8:30 AM - 11:30 AM Z18

Takahiro Yamada(Tohoku Univ.), Koichiro Suekuni(九大)

10:15 AM - 10:30 AM

[8a-Z18-7] Lowering the lattice thermal conductivity of colusite via interstitial doping

Koichiro Suekuni1, Yuta Shimizu1, Hikaru Saito1, Raju Chetty2, Michihiro Ohta2, Toshiro Takabatake3, Michitaka Ohtaki1 (1.Kyushu Univ., 2.AIST GZR, 3.Hiroshima Univ.)

Keywords:thermoelectric materials, sulfides, lattice thermal conductivity

Atomic-scale defects/disordered states are thought to be responsible for lowering the lattice thermal conductivity for thermoelectric colusites. In this study, we investigated the effect of interstitial Cu atoms (defects) on the thermal conductivity for Cu26V2Ge6S32 colusite. The thermal conductivity was compared between Cu-doped and non-doped samples with equivalent hole carrier concentration. The former sample showed suppressed thermal conductivity, indicating the strong phonon scattering due to the introduction of interstitial Cu atoms.