Palani, Indirajith Park, Jaeyoung Ji, Hyeonseok Kim, Chaerim Pham, Hoang Giang Cho, Sangho Sung, Myung Mo 2024-11-13T15:00:06Z 2024-11-13T15:00:06Z 2024-11-12 2025-05 1226-086X https://pubs.kist.re.kr/handle/201004/151050 Semiconducting metal oxides, such as zinc oxide (ZnO), are gaining recognition for thermoelectric applications due to their temperature stability, availability, eco-friendliness, and cost-effectiveness. However, ZnO faces challenges in achieving high ZT value due to its low carrier concentration and high thermal conductivity. Traditional methods, like doping and defect engineering, have shown limited success in overcoming these challenges. In this study, we introduce a unique superlattice structure with a phase-composite composition that significantly decreases thermal conductivity through enhanced phonon scattering while maintaining the power factor by inducing new resonant conducting states near the mobility edge. By optimizing nanolayer thickness and doping concentration, we achieved a remarkable power factor of 14.6 μW cm？1 K？2 and reduced thermal conductivity to ∼1.97 W m？1 K？1 at room temperature in samples with 6 nm-thick ZnO nanolayers fabricated at 100 °C. This leads to a ZT value of ∼0.22 at 300 K, the highest among metal oxide thermoelectric materials at low temperatures, which further increases to ∼0.55 at 510 K. These findings demonstrate the potential of hybrid superlattices for efficient low-temperature thermoelectric applications. English 한국공업화학회 ZnO/Organic superlattice with phase composite structure for enhanced thermoelectric performance at low temperature Article 10.1016/j.jiec.2024.10.062 1 Journal of Industrial and Engineering Chemistry, v.145, pp.659 - 667 Journal of Industrial and Engineering Chemistry 145 659 667 N scie scopus kci 001436826500001 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article DOPED ZNO THIN-FILMS THERMAL-CONDUCTIVITY TRANSPORT-PROPERTIES IMPURITY SCATTERING CONVERGENCE CERAMICS RECORD FIGURE PBTE Zinc oxide superlattices Thermoelectric materials Phase-composite structure Thermal conductivity reduction Power factor optimization