[15p-E206-1~15] 9.4 Thermoelectric conversion

△ [15p-E206-9] Elucidating the origin of power factor enhanced in embedded-ZnO nanowire structures

〇(D)Takafumi Ishibe¹, Atsuki Tomeda¹, Kentaro Watanabe^1,2, Jun Kikkawa³, Yoshiaki Nakamura^1,2 (1.Osaka Univ., 2.CREST-JST, 3.NIMS)

Keywords:oxide, nanowire, power factor

ZnO is a promising for transparent thermoelectric material due to the wide energy bandgap and the high power factor(S²σ), where S is seebeck coefficient and σ is electrical conductivity. However, the thermoelectric properties are still poor to use in the industrial field. Therefore, it is important to increase S²σ and decrease thermal conductivity (k). In our previous work, we succeeded to fabricate the embedded-ZnO nanowire structures and increase S²σ twice larger than ZnO films (containg no nanowire). In this work, we investigate the effect of nanowire on electrical conduction and elucidate the mechanism of increased S²σ.