Akademik Veri Yönetim Sistemi
Nanophotonics and Micro/Nano Optics International Conference 2025, Paris, Fransa, 20 - 22 Ekim 2025, (Yayınlanmadı)
In recent years, two-dimensional (2D) transition metal dichalcogenides (TMDs), have gained attention as promising candidates for thermoelectric applications. Their layered structures and high surface-to-volume ratios inherently lead to low thermal conductivity and improved thermoelectric performance compared to bulk materials. In addition to these intrinsic advantages, the chemical tunability of their electronic and optical properties has further increased interest in optimizing their thermoelectric behaviour.
In this study, we investigate the effect of UV-ozone and dichloroethane (DCE) treatments on the thermal expansion coefficient of WS₂. UV-ozone exposure induces p-type doping, while DCE treatment introduces n-type doping. These complementary approaches significantly alter the carrier concentration, Seebeck coefficient, and power factor, enabling precise tuning of thermoelectric performance. Through temperature-dependent micro-photoluminescence (PL) and micro-Raman spectroscopy, we demonstrate that surface functionalization affects not only the electrical (carrier concentration, mobility) and optical (band gap) properties of WS₂, but also offers a practical route for enhancing its thermoelectric efficiency. Our findings underscore the potential of controlled post-growth treatments as an effective strategy for engineering high-performance 2D thermoelectric materials.