| 초록 |
Mechanical moduli of common organic electronic materials are measured by buckling method. By applying small (~2%) compressive strain to organic/PDMS samples, the layer becomes buckled with characteristic wavelength. Fitting the experimentally measured data of buckling wavelength as a function of layer thickness with model equation yields mechanical modulus of organic layer. The measured values compare well with those from theoretical prediction, for materials such as P3HT and its blend with PCBM, and polyaniline. The modulus of PEDOT:PSS, however, shows ~2 times larger modulus value than that of constituent polymers, which is attributed to strong ionic interaction between parent polymers. The thermally evaporated pentacene film shows modulus value of ~15 GPa that is an order of magnitude larger than polymeric materials investigated here, and shows delamination upon large compression. |
