Since the thermoelectric properties are proportional to the electrical conductivity and inversely proportional to the thermal conductivity, independent control of thermal conductivity and electrical conductivity is essential. Therefore, in this study, mesoporous structure was applied to decrease thermal conductivity. And, Au NPs were incorporated to increase the electrical conductivity. Reverse triblock copolymer and cosolvent system were introduced for uniform dispersion of Au NPs. The collapse of the pore structure was minimized due to the uniform dispersion of Au NPs and the porosity increased by 10% from 20% to 30% when compared with pristine ZnO thin films. A mesoporous ZnO composite thin film containing 1 at.% Au NPs exhibited an electrical conductivity that was five times greater than that of a pristine mesoporous ZnO thin film. In addition, the power factor increased by about 3.5 times, from 9.53 ± 1.50 μW/mK2 to 32.72 ± 5.16 μW/mK2 at 503 K.
Bibliographical noteFunding Information:
This work was supported by ' Korea-Africa Joint Research Program ' grant funded by the Korea government (Ministry of Science, Technology & ICT) in 2017K1A3A1A09085891 . This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education ( NRF-2015R1D1A1A02062229 ). Experiments at PLS were supported in part by MEST and POSTECH .
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics