POS5-0066
Ligand-Engineered Stretchable Metal Oxide Transistors Using Styrene-Functionalized β-Diketone Ligands
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Hyo Min Ahn (POSTECH)
Co-Author(s)
Abstract
Solution-processed metal oxide thin-film transistors (TFTs) are promising for next-generation display backplanes because of their high electrical performance, low-voltage operation, and compatibility with scalable fabrication. However, conventional oxide dielectrics and semiconductors are intrinsically brittle ceramic materials, which limits their direct application to mechanically stretchable electronics. To overcome this limitation, this work proposes a ligand-engineering strategy to improve the mechanical compliance of the entire oxide transistor stack. A styrene-functionalized β-diketone ligand is designed as a multifunctional molecular additive for ZrO₂/In₂O₃/ZnO-based oxide TFTs. The β-diketone group can coordinate with metal oxide species, while the styrene group can form a thermally crosslinked organic network during annealing. By incorporating this ligand into all oxide layers, including the ZrO₂ dielectric and In₂O₃/ZnO semiconductor layers, brittle oxide networks are expected to be connected with a flexible molecular framework, enabling stretchable oxide electronics while maintaining transistor performance. As an initial demonstration, ZrO₂/In₂O₃/ZnO TFTs containing 5 mol% ligand exhibited an on/off ratio of 7.33 × 10⁴ and a field-effect mobility of 26 cm²/V·s, comparable to pristine devices. Based on this result, stretchable TFTs will be fabricated on elastomeric substrates using a bottom-gate/top-contact architecture. CNT spray coating will be used for the gate electrode because CNT networks can better withstand the 200–250 °C oxide annealing process. In contrast, AgNW spray-coated source/drain electrodes will be deposited after oxide formation to avoid thermal degradation. This approach provides a route toward intrinsically stretchable oxide TFT backplanes by combining ligand-engineered oxide layers with compliant spray-coated electrodes.
